publications - Kouman S. Koumanov

    1. Koumanov, K. and L.E. Long (2017). Chapter 10 Site Preparation and Orchard Infrastructure. In: Quero-Garcia, J., A. Iezzoni, J. Puławska and G. Lang (Eds.) Cherries: Botany, Production and Uses, CABI, Boston, 223-243.
    2. Koumanov, KS, JW Hopmans, and L.J. Schwankl (2006). Spatial and Temporal Distribution of Root Water Uptake of an Almond Tree under Microsprinkler Irrigation.  Irrigation Science 24(4): 267-278.
    3. Koumanov, K., J.W. Hopmans, L.J. Schwankl, L. Andreu, and A. Tuli (1997). Application efficiency of micro-sprinkler irrigation of almond trees. Agricultural Water Management, 34: 247-263.
    4. Koumanov, K.S., Staneva, I.N., Kornov, G.D., Germanova, D.R. (2018). Intensive sweet cherry production on dwarfing rootstocks revisited. Scientia Horticulturae 229: 193-200.
    5. Koumanov, K.S. (2017). Sample size determination in horticultural research: An empirical approach. Scientia Horticulturae 225: 416-421. http://dx.doi.org/10.1016/j.scienta.2017.07.027
    6. Koumanov, K. (2015). On the mechanisms of the sweet cherry (Prunus avium L.) fruit cracking: Swelling or shrinking?. Scientia Horticulturae 184: 169-170.
    7. Schwankl, L.J., J.P. Edstrom, J.W. Hopmans, L. Andreu, and K.S. Koumanov (1999). Microsprinklers wet larger soil volume; boost almond yield, tree growth. California Agriculture 53(2): 39-43.
    8. Koumanov, K.S., J.W. Hopmans and L.J. Schwankl (2004). Soil water dynamics in the root zone of a micro-sprinkler irrigated almond tree. Acta Horticulturae (ISHS) 664:369-375.
    9. Koumanov, K.S., I.N. Tsareva (2017). Intensive Sweet Cherry Production: Potential, “Bottlenecks”, Perspectives. Acta Hortic. 1161, 103-110.
    10. Koumanov, K.S., I Tsareva, K. Kolev, G. Kornov (2009). Fertigation of primocane-fruiting raspberry – leaf and soil nutrient content between applications. Acta Horticulturae (ISHS) 825:341-348.
    11. Koumanov, K.S., Z. Rankova, K. Kolev, S. Shilev (2009). Herbigation in a cherry orchard – translocation and persistency of pendimethalin in the soil. Acta Horticulturae (ISHS) 825:305-312.
    12. Rankova, Z., K. Koumanov, K. Kolev, S. Shilev (2009). Herbigation in a cherry orchard – efficiency of pendimethalin. Acta Horticulturae (ISHS) 825:459-464.
    13. Koumanov, K.S., I.N. Tsareva and G.D. Kornov (2017). Fertigation: content of mineral nutrients in the soil and in the leaves of sweet cherry trees between two applications. Acta Hortic. 1161, 125-132.
    14. Koumanov, K.S., Staneva, I.N., Kornov, G.D. and Germanova, D.R. (2016). Sweet cherry fruit quality under fertigation. Acta Hortic. 1139, 551-558.
    15. Koumanov, K.S., Kornov, G.D. and Zyapkov, D.E. (2016). Economics of primocane-fruiting raspberry production in lowland conditions. Acta Hortic. 1139, 709-714.
    16. Gandev, S., V. Arnaudov, V. Dzhuvinov, M. Perifanova-Nemska, K. Koumanov (2013). Agrobiological Evaluation of 'Lara' Walnut Cultivar under the Climatic Conditions of South Bulgaria. Acta Horticulturae (ISHS) 981:141-146.
    17. Koumanov, K.S. (2003). Development of irrigation and drainage in Bulgaria (invited paper).Vodoprivreda, 35 (201-202): 86-90
    18. Rankova, Z., K.Koumanov (2004). Efficiency of some soil herbicides in a raspberry plantation under drip irrigation. Jugoslovensko voćarstvo 38(147-148): 163-169. 
    19. Koumanov, K.S. (2000). Microsprinkling and drip irrigation effects on microclimate in peach ecosystem. Journal of Balkan Ecology, 3(4): 79-90.
    20. Koumanov, K.S. (2007). On the necessity for further improvement in microirrigation scheduling. ICID 22nd European Regional Conference, 2-7 September 2007, Pavia, Italy, 7 pp. 
    21. Koumanov, K.S., K. Kolev, Z. Rankova, S. Milusheva, Z. Rusalimov and I. Tsareva (2006). Regulated deficit drip irrigation and water use efficiency of a raspberry (Rubus Idaeus L.) primocane-fruiting cultivar. ICID 7-th International Micro Irrigation Congress. B-40: 7 pp.
    22. Koumanov, K.S. (2002). Towards improving of water management in fruit-tree plantations under micro-irrigation. ICID 18th Congress. Paper Q50.1/P1.02. 21-28 July, Montreal, Canada, 12 pp.    
    23. Koumanov, K.S. (2002). Drought mitigation effects of microirrigation in orchards. ICID International Conference on "Drought Mitigation and Prevention of Land Desertification", Bled, Slovenia, 20-26 April, 10 pp.    
    24. Koumanov, K.S. (2001). Evaluation of drainage in budget method based irrigation scheduling. ICID 19th European Regional Conference “Sustainable Use of Land and Water”, Paper 004, 4—8 June 2001, Brno and Prague, Czech Republic, 5pp.      
    25. Koumanov, K., G. Stoilov, and D. Dochev (2001). The "nitrate nitrogen – electrical conductivity" relationship in non-saline soils under fertigation. ICID 19th European Regional Conference “Sustainable Use of Land and Water”, Paper 136, 4—8 June 2001, Brno and Prague, Czech Republic, 8pp.       
    26. Koumanov, K.S. (2003). Water application efficiency and the paradigms of microirrigation scheduling in orchards. Conference on: Integrated Water Management: Policy Aspects, Agricultural Research Institute, Nicosia, Cyprus, 14-16 April 2003.   
    27. Koumanov, K.S. (2004). Nitrogen use efficiency under fertigation of a raspberry plantation during the first vegetation. ICID-MAKCID 4-th International Workshop on Research on Irrigation and Drainage, Skopje, Republic of Macedonia, 24 March 2004, pp. 149-158. 
    28. Milusheva, S., K. Koumanov and G. Kornov (2012). First report on identification of raspberry bushy dwarf virus in red raspberry (Rubus idaeus L.) in Bulgaria. Third Congress of Virology, October 25-27, 2012, Sofia. Proceedings and Abstracts: 127-131.
    29. Koumanov, K., D. Dochev, and G. Stoilov (1998). Investigations on fertigation of peach on three soil types – patterns of soil wetting. Bulg. J. Agric. Sci., 4: 745-753.
    30. Koumanov, K., G. Stoilov, and D. Dochev (1999). Investigations on fertigation of peach on three soils.III.Zones of salt accumulation. Bulg. J. Agric. Sci., 5: 725-730
    31. Stoilov, G., D. Dochev and K. Koumanov (1999). Investigations on fertigation of peach on three soils.II.Migration and localization of phosphorus. Bulg. J. Agric. Sci., 5: 615-620.
    32. Stoilov, G., K. Koumanov, and D. Dochev (1999). Investigations on fertigation of peach on three soils.I.Migration and localization of nitrogen. Bulg. J. Agric. Sci., 5: 605-614.
    33. Koumanov, K., D. Dochev, and G. Stoilov, (2000). Investigations on fertigation of peach on three soils – Influence on the distribution of Mn, K, and pH. Plant Science 37: 373-381.
    34. Koumanov, K. (2010).  The microirrigation – problems and chalenges. Agricultural Engineering 3: 85-89 (abstract in English).     
    35. Koumanov, K., G. Kornov, V. Kazandjiev (2009). The irrigation – an integrating component of modern fruitgrowing. Plant Science 46: 224-229 (abstract in English).
    36. Koumanov, K., G. Stoilov and D. Dochev (2005). Fertigation as an alternative of the traditional fertilization with phosphorus in the orchards. Soil Sci., Agrochem. & Ecol. XL(2): 12-16 (summary in English).
    37. Kolev, K., Z. Rankova and K. Koumanov (2008). Effect of isoxaflutol (Merlin 750 WG) on the vegetative habits and the yield of intensively grown sweet cherry trees. Plant Science 45: 261-264 (summary in English).
    38. Koumanov, K., I. Tsareva (2014). Intensive Cherry Production: Why, How, Whither. Plant Science LI(1): 27-32 (summary in English).
    39. Koumanov, K. (2004).Do we evaluate properly the application rates under microirrigation of orchards. Plant Science 40: 451-456 (summary in English).
    40. Kornov, G., A. Matev and K. Koumanov (2016). The “water–yield” relationship: model calibration in the case of raspberry (Rubus Idaeus). Agricultural Sciences VIII(20): 137-141.
    41. Rusalimov, J., K. Koumanov (2005). Mechanized pruning of primocane-fruiting raspberry varieties. Proceedings, National Centre for Agrarian Sciences 3: 263-267 (in Bulgarian).
    42. Rankova, Z., K. Koumanov and G. Kornov (2014). Herbicide efficacy and selectivity of oxyfluorfen (Goal 4F) applied through the micro-irrigation system. Ecology and Future ХІІІ(4): 34-38 (in Bulgarian).
    43. Milusheva, S., Z. Rankova, K. Koumanov, G. Kornov (2014). Epidemiology of viral diseases in raspberry plantation: identification of Nepoviruses in the weed association. Plant Science LI(1): 33-37 (summary in english).
    44. Gandev, S., V. Arnaudov, V. Manolova, L. Nacheva, K. Koumanov, D. Borisova, M. Nikolova, E. Blagoeva (2014). State and Perspectives of nut crops in Bulgaria. Plant Science LI(1): 3-14.
    45. Tsareva, I., I. Terziev, K. Koumanov and K. Kolev (2009). Mineral nutrients content of the sweet cherry leaves during the vegetation in some cultivar-rootstock combinations. Plant Science 46: 116-120 (summary in English).
    46. Koumanov, K. (1998). Correlation between the readings of two types evaporation pans used for scheduling and management of the irrigation process. Plant Science, 35: 142-143 (summary in English).
    47. Koumanov, K. (1998). Evaporation of a peach plantation and amount of the additionally consumed by a sod mulch water under micro-sprinkler irrigation. Plant Science, 35: 225-228 (summary in English).
    48. Koumanov, K. (2000).Temperature regime of the root zone of a peach tree under drip-irrigation. Plant Science 37: 39-43 (summary in English).
    49. Koumanov, K. (2000). About the state, targets and challenges before the research on the irrigation of fruit crops. Agricultural Science 2/2000: 32-35 (summary in English).
    50. Dimitrov, D., K. Koumanov (1999). Economical effectiveness of the peach production under microsprinkler irrigation and perennial grassing of the interlines. Agricultural Economics and Management, 7: 24-26 (summary in English).
    51. Koumanov, K. (1995). On the methods for evaluating the used part of the rainfall under field experiments. Plant Science, 32(7-8), pp.159-161 (summary in English).
    52. Koumanov, K. (1995). Evaluating the used part of the rainfall under field experiments.I.One more reliable solution. Plant Science, 32(7-8), pp.162-164 (summary in English).
    53. Koumanov, K. Evaluating the used part of the rainfall under field experiments.II.Raising the exactness of the solution. Plant Science, 32(7-8), pp.165-168 (summary in English).
    54. Koumanov, K. (1992). Under-crown micro-sprinkling – a promising way of irrigation in fruitgrowing. Agricultural Science, Vol. XXX, No4-6, pp. 74-79 (summary in English).
    55. Koumanov, K. (2003). Phenologically based irrigation regimes for drip irrigation of raspberry. Journal of Mountain Agriculture on the Balkans, 6(5):518-529.
    56. Koumanov, K. (2011). The pilot-sample size in statistical analysis. Journal of Mountain Agriculture on the Balkans, 14(6): 1346-1357.
    57. Koumanov, K., G. Kornov, K. Kolev and Z. Rankova (2006). The daily yield impact on the harvesting economical efficiency fro primocane-fruiting raspberry varieties. Journal of Mountain Agriculture on the Balkans 9(6):1065-1076.
    58. Koumanov, K., K. Kolev (2007). On the volume of raspberry fruit sample when estimating the average mass of one fruit. Journal of Mountain Agriculture on the Balkans, 10(6):1128-1139.
    59. Koumanov, K., K. Kolev (2008). Volume of the sample for estimating the average mass and the dimensions of one cherry and apple fruit. Journal of Mountain Agriculture on the Balkans, 11(7): 1478-1490.
    60. Koumanov, K., K. Kolev (2009). Sample size estimation. Journal of Mountain Agriculture on the Balkans, 12(6): 1566-1575.
    61. Koumanov, K., K. Kolev, Z. Rankova, S. Milusheva, Z. Rusalimov and I. Tsareva (2005). Yield and growth of Lyulin raspberry variety under lowland conditions and regulated-deficit drip irrigation. Journal of Mountain Agriculture on the Balkans, 8(1):83-94.
    62. Koumanov, K., M. Moteva and V. Kazandjiev (2010). Estimation of the evapotranspiration of a peach orchard from meteorological data – easy or complicated?. Journal of Mountain Agriculture on the Balkans 13(6): 1621-1634.
    63. Koumanov, K., I Staneva and G. Kornov (2016).Distribution uniformity of dissolved in irrigation water substances under drip irrigation. Journal of Mountain Agriculture on the Balkans 19(1): 148-157.
    64. Koumanov, K., Matev, A., Kornov, G., Germanova, D. (2018). Irrigation management in perennial crops by sensing the plant water status. Journal of Mountain Agriculture on the Balkans 21(5): 172-181.
    65. Koumanov, K., Matev, A., Kornov, G., Germanova, D. (2018). Irrigation management in perennial crops by sensing the soil water status. Journal of Mountain Agriculture on the Balkans 21(5): 182-192.
    66. Matev, A., Koumanov, K. Kornov. G. (2018). Modeling of irrigation regime influence on yield of the vine cultivars Hebros and Trakiyska Slava. Journal of Mountain Agriculture on the Balkans 21(6): 105-114.
    67. Kornov, G., K. Koumanov and I Tsareva (2013). Content of mineral elements in the leaves of the "Lyulin" promocane-fruiting raspberry cultivar under regulated deficit drip irrigation and fertigation. Journal of Mountain Agriculture on the Balkans. 16(4):1009-1019.
    68. Kornov, G., K. Koumanov, and I. Tsareva (2011). Regulated deficit drip irrigation impact on the fruit chemical composition of ‘Lyulin’ primocane-fruiting raspberry cultivar. Journal of Mountain Agriculture on the Balkans 14(6): 1319-1330.
    69. Kornov, G., K. Koumanov, K. Kolev, Z. Rankova, S. Milusheva and I Tsareva (2010). Regulated deficit drip irrigation impact on the growth of the 'Lyulin' primocane-fruiting raspberry cultivar. Journal of Mountain Agriculture on the Balkans 5: 1374-1384.
    70. Kornov, G., K. Koumanov, S. Milusheva, K. Kolev, Z. Rankova and I. Tsareva (2009). Regulated deficit drip irrigation impact on the yield of the 'Lyulin' primocane-fruiting raspberry cultivar. Journal of Mountain Agriculture on the Balkans, 12(6): 1553-1565.
    71. Kornov, G., Koumanov, K. and Staneva, I. (2016). A state of raspberry production and prospects for its development in lowland conditions. Journal of Mountain Agriculture on the Balkans, 19(5): 159-169.
    72. Kornov, G., Staneva, I., Koumanov, K. and Gandev. S. (2017). Cultivar and tree training system impact on the content of mineral nutrient elements in the leaves under intensive apple production. Journal of Mountain Agriculture on the Balkans, 20(4): 280-289.
    73. Kornov, G., Koumanov, K, Staneva, I., Germanova, D. (2018). State-of-the-art of walnut production and perspectives for development in Bulgaria. Journal of Mountain Agriculture on the Balkans 21(2): 194-203.
    74. Kornov, G., Koumanov, K, Staneva, I., Germanova, D. (2018). State-of-the-art of actinidia (kiwi) production and perspectives for development in Bulgaria. Journal of Mountain Agriculture on the Balkans 21(4): 249-256.
    75. Kornov, G., Koumanov, K, Staneva, I., Germanova, D. (2019). Impact of the 'Gisela 5' Rootstock on the Yield and the Fruit Quality of Mature Cherry Trees. Journal of Mountain Agriculture on the Balkans 22 (4), 181-191.
    76. Корнов, Г., Koumanov, K. (2020). Отглеждане на ремонтантния малинов сорт „Люлин“ (Rubus idaeus) в равнината: метеорологични условия, настъпване и продължителност на основните фенологични фази в района на Пловдив. Journal of Mountain Agriculture on the Balkans 23(4): 163-178.
    77. Rankova, Z. and K. Koumanov (2005). Yield of Lyulin remontant raspberry cultivar after treatment with some soil herbicides under the conditions of continuous soil wetting. Journal of Mountain Agriculture on the Balkans, 8(2):193-201.
    78. Rankova, Z. and K. Koumanov (2006). Effect of some soil herbicides on chlorophyll content in the leaves of Lyulin raspberry cultivar grown under drip irrigation conditions. Journal of Mountain Agriculture on the Balkans, 9(2):250-259.
    79. Rankova, Z. and K. Koumanov (2007). Effect of the soil herbicide Dihlobenil (Casoron 6, 7G) on the growth and development of Samodiva cv. raspberries grown under drip irrigation conditions. Journal of Mountain Agriculture on the Balkans, 10(2):372-381.
    80. Rankova, Z. and K. Koumanov (2010). Effect of some soil herbicides on the growth and yield of 'Lyulin' primocane-fruiting raspberry cultivar grown under drip irrigation. Journal of Mountain Agriculture on the Balkans, 13(4): 961-971.
    81. Staneva, I., K. Koumanov and G. Kornov (2016). Growth rate of fruit and shoots in seven sweet-cherry cultivar/rootstock combinations. Journal of Mountain Agriculture on the Balkans, 19(4): 164-174.
    82. Tsareva I., K. Kolev, V. Dzhuvinov, K. Koumanov (2007). Dynamics of nitrogen, phosphorus and potassium content in sweet cherry leaves of different cultivar/rootstock combinations. Journal of Mountain Agriculture on the Balkans, 10(6):1082-1092.
    83. Tsareva, I., K. Koumanov and K. Kolev (2009). Dynamics of shoot and fruit growth in some cultivar-rootstock combinations of sweet cherry under drip irrigation and fertigation. Journal of Mountain Agriculture on the Balkans, 12(6): 1607-1615.
    84. Tsareva, I., K. Koumanov and G. Kornov (2010). Effect of phenological phases on the mineral content of leaves of six cherry cultivars grafted on 'Gisela 5' rootstock – implications for improving fertilization through micro-irrigation and fertigation. Journal of Mountain Agriculture on the Balkans 13(5): 1338-1352.
    85. Tsareva, I., K. Koumanov and G.Kornov (2011). Tuning fertigation: rootstock impact on the mineral content of flower buds, flowers and leaves of the ‘Bigarreau Burlat’ cherry cultivar.Tuning fertigation: rootstock impact on the mineral content of flower buds, flowers and leaves of the ‘Bigarreau Burlat’ cherry cultivar. Journal of Mountain Agriculture on the Balkans, 14(6): 1292-1303.
    86. Tsareva, I., K. Koumanov and G.Kornov (2013). Tuning fertigation: impact of frequent nitrogen applications on the mineral nutrient content in the soil and in the leaves of the sweet cherry trees. Journal of Mountain Agriculture on the Balkans, 16(4): 983-994. 
    87. Tsvetanov, E. and K. Koumanov (2010). Improving the irrigation scheduling of a grapevine nursery taking in account the increasing root zone during vegetation. Journal of Mountain Agriculture on the Balkans, 13(4): 985-997.
    88. Tsvetanov, E. and K. Koumanov (2011). Improving the grapevine nursery irrigation regime: a model of root zone enlargement. Journal of Mountain Agriculture on the Balkans, 14(5): 1099-1110.
    89. Tsvetanov, E, I. Simeonov and K. Kumanov (2014). First results of the study on the impact of irrigation upon the actual fertility indicators in table seed and seedless varieties. Journal of Mountain Agriculture on the Balkans, 17(2): 371-387.
    90. Tsvetanov, E. and K. Koumanov (2016). Biophysical coefficients for evaluationof grapevine nursery evapotranspiration. Journal of Mountain Agriculture on the Balkans, 19(4): 183-198.
    91. Tsvetanov, E, A. Matev and K. Koumanov (2015). Calibration of models describing “irrigation rate – yield” correlation under micro-irrigation conditions in the vine nursery. Viticulture and Enology 5: 14-19.
    92. Petrova, R, A. Matev and K. Koumanov, B. Harizanova-Petrova (2013). Productivity of green beans irrigated at different pre-irrigation soil moisture. Journal of Agricultural Science and Technology 5(4): 432-437.
    93. Petrova, R, A. Matev and K. Koumanov (2013). Productivity of green been grown by regulated water deficit conditions. Science & Technologies 3(6): 151-156. (summary in English)
    94. Petrova, R, A. Matev and K. Koumanov (2013). Formation of evapotranspiration at green beens, irrigated at different pre irrigation soil moisture. Science & Technologies 3(6): 157-162. (summary in English)
    95. Petrova, R, Harizanova-Petrova, B., Matev, A., Koumanov, K., Nikolova, M., Kuneva, V. (2016). Evapotranspiration’s biophysical coefficients of French beans for the egion of Plovdiv. Management and sustainable development 60(5): 91-96.
    96. Lichev V., Tabakov S., Yordanov A., Dobrevska G., Govedarov G., Manolov I., Koumanov K., Rankova Z., Nikolov H. (2020). Fruitgrowing. Lichev V. (ed.), Videnov and son, Plovdiv, 663 pp.
    97. Koumanov, K. (2013). Irrigation of walnut. In: Walnut – second revised edition (Dzhuvinov, V, Gandev, S., Koumanov, K and Arnaudov, V.), Monograph, Biofruit BG – Ltd., 128-151 (in Bulgarian).
    98. Koumanov, K. (2013). Floor management in the walnut orchard. In: Walnut – second revised edition (Dzhuvinov, V, Gandev, S., Koumanov, K and Arnaudov, V.), Monograph, Biofruit BG – Ltd., 152-156 (in Bulgarian).
    99. Koumanov, K. (2013). Fertilization of walnut. In: Walnut – second revised edition (Dzhuvinov, V, Gandev, S., Koumanov, K and Arnaudov, V.), Monograph, Biofruit BG – Ltd., 92-127 (in Bulgarian).
    100. Koumanov, K. (2010). Irrigation of walnut. In: Walnut (Dzhuvinov, V, Gandev, S., Koumanov, K and Arnaudov, V.), Monograph, Biofruit BG – Ltd., 112-134 (in Bulgarian).
    101. Koumanov, K. (2010). Floor management in the walnut orchard. In: Walnut (Dzhuvinov, V, Gandev, S., Koumanov, K and Arnaudov, V.), Monograph, Biofruit BG – Ltd., 135-139 (in Bulgarian).
    102. Koumanov, K. (2010). Fertilization of walnut. In: Walnut (Dzhuvinov, V, Gandev, S., Koumanov, K and Arnaudov, V.), Monograph, Biofruit BG – Ltd., 78-111 (in Bulgarian).
    103. Koumanov, K. (2008). Irrigation. In: Handbook on Fruitgrowing (Ed. Dzhuvinov, V.), EXACT 93, Plovdiv, 133-152 (in Bulgarian).
    104. Koumanov, K. (2008). Fertilization. In: Handbook on Fruitgrowing (Ed. Dzhuvinov, V.), EXACT 93, Plovdiv, 101-132 (in Bulgarian).
    105. Kirilov, P., K. Kamburova, L. Fachikov, K. Koumanov and I. Pachev (2010). Liquid Fertilizers: Composition, Properties and application. University of Chemical Technology and Metallurgy, Sofia, 91 pp. (in Bulgarian).
    106. Zhivondov, A., V. Manolova, Z. Rankova, V. Bozhkova, V. Dzhuvinov, K. Koumanov, S. Masheva, M. Mihov, G. Antonova, E. Nacheva, G. Pevicharova, D. Kostova, V. Koteva, L. Krasteva, Ts. Georgiev, D. Strelkova, S. Vitkova, S. Bachvarova, A. Rusenov, S. Tsoneva, K. Lambrev, A. Bozhinova (2008). Strategy for developing the fruit and vegetable production in Republic of Bulgaria during the period 2009-2013. Ministry of Agriculture and Food, Agricultural Academy, 80 pp (in Bulgarian).
    107. Koumanov, K., G. Stoilov, and I. Stamatov (1994). Microirrigation of peach under sod mulch in the interrows. Proceedings, ICID 17th European Conference on Irrigation and Drainage, Varna, 16-22 May, Vol.3, Paper 3.36: 261-266.
    108. Koumanov, K., G. Stoilov, and I. Stamatov (1994). Microirrigation of fruit crops and possibilities of saving the soil fertility. Proceedings, ICID 17th European Conference on Irrigation and Drainage, Varna, 16-22 May, Vol.3, Paper 3.37: 267-273.
    109. Rankova, Z. and K. Koumanov (2010). Effect of some soil herbicides on plant mineral nutrition and yield quality of the ‘Lyulin’ primocane-fruiting raspberry cultivar grown under drip irrigation. Scientific Works of the Agricultural University – Plovdiv. Vol. LV (1): 297-302.
    110. Koumanov, K. (1994). On the structure of the wetted soil volume under micro-irrigation of peach (preliminary results). Proceedings, Research Institute for Irrigation, Drainage and Hydraulic Engineering-Sofia, Vol.XXIV, Agricultural Academy, pp. 122-127 (summary in English).
    111. Koumanov, K. (1994). The birds – a real threat to drip-irrigation systems. Proceedings, Research Institute for Irrigation, Drainage and Hydraulic Engineering-Sofia, Vol.XXIV, Agricultural Academy, pp. 129-130 (summary in English).
    112. Koumanov, K. (1998). Estimation of the drainage below the root zone in field experiments with irrigation. Proceedings of the Research Institute for Irrigation, Drainage and Hydraulic Engineering at the Agricultural Academy, Sofia, Vol. 25: 197-201 (summary in English).
    113. Koumanov, K. and D. Davidov (1998). Evapotranspiration of a peach plantation with grassed interlines under micro-sprinkler irrigation. Proceedings of the Research Institute for Irrigation, Drainage and Hydraulic Engineering at the Agricultural Academy, Sofia, Vol. 25: 190-196 (summary in English).
    114. Koumanov, K. (2006). Application of agrochemicals through the microirrigation systems. Proceedings, First International Symposium “Ecological Approaches Towards the Production of Safety Food”, Association “Regional Science and Technology Unions – Plovdiv”, 19-20 October 2006, Plovdiv: 139-144 (summary in English).
    115. Koumanov, K. (2007). Effective and environment-friendly use of the microirrigation systems in orchards. Proceedings, Second International Symposium “Ecological Approaches Towards the Production of Safety Food”, Association “Regional Science and Technology Unions – Plovdiv”, 18-19 October 2007, Plovdiv, Bulgaria, 207-212 (summary in English).
    116. Koumanov, K., I. Tsareva and G. Kornov (2011). Fertigation: content of mineral nutrients in the soil solution and the leaves of cherry trees between two applications. Proceedings of the International Conference “100 Years Bulgarian Soil Science”, 16-20 May, Sofia, pp. 564-568 (summary in English).
    117. Zhivondov, A., K. Koumanov, V. Dzhuvinov, V. Bozhkova, K. Kolev, Z. Rankova, V. Manolova and V. Arnaudov (2006). Efficient and environmentally friendly fruit production. Proceedings, First International Symposium “Ecological Approaches Thowards the Production of Safety Food”, Association “Regional Science and Technology Unions – Plovdiv”, 19-20 October 2006, Plovdiv: 41-48. (summary in English).
    118. Rankova, Z. and K. Koumanov, G. Kornov, K. Kolev, S. Shilev (2009). Herbigation – ecologically sound approach for weed control in fruit plantations. 3-rd Int. Symposium “Ecological Approaches Thowards the Production of Safety Food”, 55-60.
    119. Koumanov, K., G. Stoilov, and D. Dochev (2000). Possibilities for express evaluation of nitrate content in non-saline soils. Proceedings: 3-rd National Scientific and Technical Conference with International Participation “Ecology and Health’ 2000”, Plovdiv, 26 Oct., pp. 111-114.
    120. Rankova, Z., K. Koumanov, G. Kornov (2016). Herbicide efficiency and selectivity of combined herbicide Metofen (oxyfluorofen + metholahlor) applied through the microirrigation system. National Scientific and Technical Conference with International Participation “Ecology and Health’ 2016”, Plovdiv, 9 June, 25-29.
    121. Koumanov K. (2018). Chemigation - a prospective alternative for application of agrochemicals with the irrigation water. Plant protection 8-19: 25-30.
    122. Koumanov, K. (2005). Toward a proficient design, construction and use of the micro-irrigation systems. Agriculture Plus 4: 32-33. (in Bulgarian).
    123. Koumanov, K. (2005). Micro-sprinkler irrigation in orchards. Agriculture Plus 5: 31-32. (in Bulgarian).
    124. Koumanov, K. (2005). Fertigation: the modern alternative for fertilization. Agriculture Plus 6-7: 31-32. (in Bulgarian).
    125. Koumanov, K. (2007). Chemigation: application of agro-chemicals with the irrigation water. Agriculture Plus 5: 29-31. (in Bulgarian).
    126. Koumanov, K. (2008). Micro-irrigation: use and abuse. Agriculture Plus 7-8: 9-10 (in Bulgarian).
    127. Kornov G., Koumanov K., Staneva I., Germanova D. (2018). State of the art of walnut production and perspectives for development in Bulgaria. Agriculture Plus, 284: 3-5.
    128. Manolova, V., A. Zhivondov, K. Koumanov, K. Kolev (2008). Fruits as a source of additional incoms. Agriculture Plus 3: 14-15. (in Bulgarian).
    129. Rankova, Z., K. Koumanov, G. Kornov (2016). Application of the combined herbicide methophen (metholahlor+oxyfluorofen) with the microirrigation system. Agriculture Plus 7-8: 23-24. (in Bulgarian).
    130. Rankova, Z., K. Koumanov, G. Kornov (2012). Growth of the “Lyulin” primocane-fruiting raspberry cultivar with some herbicides. Agriculture Plus 9: 34-35. (in Bulgarian).
    131. Rankova, Z., K. Koumanov, G. Kornov, K. Kolev, S. Shilev (2010). Herbigation in fruit plantations. Agriculture Plus 4: 42-43. (in Bulgarian).
    132. Koumanov, K. (1997). Investigations on micro-sprinkler irrigation of peach. Ph.D. Thesis, Higher Testimonial Committee at the Council of Ministers, Sofia, Bulgaria, 177pp. (summary in English).
    133. Dzhuvinov, V., K. Koumanov, S. Gandev, V. Arnaudov and I. Slavov (2004). Walnut. FAO—Fruitgrowing Institute-Plovdiv TCP/BUL/0166(3001), Plovdiv 2004, 49 pp. (in Bulgarian).
    134. Dzhuvinov, V., K. Kolev, K. Koumanov, Z. Rankova, I. Slavov (2006). Intensive Growing of Cherries. PrintX Ltd., Plovdiv. 56 pp. (in Bulgarian).
    135. Dzhuvinov, V., K. Koumanov, V. Bozhkova, I. Lecheva and V. Popov (2007). Integrated Pome Fruit Production (Apple and Pear). Basic Principles and Rules. Printex Ltd., Plovdiv, 48 pp. (in Bulgarian).
    136. Dzhuvinov, V., K. Koumanov, H. Kutinkova, Z. Rankova (2008). Ecological Production of Apple Fruit. The Belgium Experience Applied in Bulgaria. PrintX Ltd., Plovdiv, 20 pp. (in Bulgarian).
    137. Koumanov, K., G. Stoilov, D. Dochev (2008). Soil type impact on water and nitrogen distribution in the root zone of peach trees under drip-fertigation. Eurosoil Congress 2008, Vienna, Austria, Report S07.M.04, p. 49 (abstract).

    138. Koumanov, K.S. K. Kolev, Z. Rankova, S. Milusheva, Z. Rusalimov and I. Tsareva (2005). Water Use Efficiency of Raspberry (Rubus Idaeus L.) in Lowland 

      Conditions under Regulated Deficit Drip Irrigation. Interdrought II, the Second International Conference on Integrated Approaches to Sustain and Improve Plant Production under Drought Stress. 24-28 September 2005, Rome (abstract).
    139. Moteva, M., Z. Zhivkov, K. Kumanov and V. Kazandjiev (2010). Irrigation scheduling on the base of variantly estimated crop evapotranspiration. Collection of Abstracts: 4-th International Conference “Trends in Agricultural Engineering 2010”, Czech University of Life Sciences – Prague, p. 104.
    140. Koumanov, K. (2005). Microirrigation: a tale about the master and the chip. Thracian Agronews 41:3.
    141. Koumanov, K. (2005). Microsprinkling: irrigation and what is more. Thracian Agronews 38:3.
    142. Koumanov, K. (2005). Fertigation: the modern alternative. Thracian Agronews.
    143. Koumanov, K. (2008). To “burn down” with drip irrigation. Maritsa, 27.05.2008 p. 11 and 03.06.2008, p. 11.
    144. Koumanov K. (2017). Microirrigation for fruit production. Agricultural Mashinery 15(659).
    145. Zhivondov, A., V. Manolova, K. Koumanov, K. Kolev, and Z. Rankova (2007). Fruit growing is profitable if managed by professionals. Bulgarian farmer, XVI(809): 7-8.
    146. Zhivondov, A. , V. Manolova, K. Koumanov, K. Kolev, and Z. Rankova (2007). Fruit growers should become organized. Bulgarian farmer, XVI(810): 7-8.

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