Irrigation and Yield Parameters of Soybean as Effected by Irrigation Management, Soil Compaction and Nitrogen Fertilization

Authors : Halil KIRNAK, Ergün DOĞAN, Osman ÇOPUR, Zeki GÖKALP

Pages : 297-309

Doi:10.1501/Tarimbil_0000001255

View : 20 | Download : 6

Publication Date : 2013-12-03

Article Type : Research Paper

Abstract :Irrigation parametersinsert ignore into journalissuearticles values(reference crop evapotranspiration, actual plant water use, amount ofirrigation water, water use efficiency, irrigation water use efficiency, plantwater consumption coefficient, variations in soil moisture based on plant waterconsumption-amount of irrigation water); and yield parameters insert ignore into journalissuearticles values(seed yield,1000-kernel weight, harvest index); were investigated for soybean grown inHarran Plain under conventional every-furrow and alternate-furrow irrigationmanagement systems, three different compaction levels insert ignore into journalissuearticles values(control withoutcompaction, low compaction, high compaction); and three different nitrogenlevels insert ignore into journalissuearticles values(6, 9, 12 kg da-1);. Experiments were carried out during 2006and 2007 cropping seasons in Şanlıurfa, Turkey in split-split plotsexperimental design with 3 replications. Irrigation program was created byKanSched simulation model. The amount of applied irrigation water inconventional and alternate furrow systems in 2006 and 2007 were measured as435.61 and 291.59 mm, and 429.51 and 271.72 mm, respectively. ET valuesdecreased with increasing compaction levels. The highest ET value insert ignore into journalissuearticles values(568 mm); wasobserved in non-compacted control treatment and the lowest value insert ignore into journalissuearticles values(240 mm); inhigh-compaction treatment. Irrigation water use efficiency increased withdecreased irrigation water and the values were higher than water useefficiencies. While the highest yield insert ignore into journalissuearticles values(94.78 kg da-1); was observed in controltreatment of the year 2006, conventional furrow system had the highest yieldinsert ignore into journalissuearticles values(209.93 kg da-1); in the year 2007. While effects of compaction and irrigationon harvest index were insignificant, nitrogen doses were found to besignificant. Results revealed that KanSched irrigation model could be used forirrigation scheduling but plant coefficients to be used in the model should bedetermined properly based on climate conditions. Negative impacts of soilcompaction in agricultural fields due to traffic and various other reasons canbe eliminated with proper irrigation and fertilization implementations.However, yield losses at high-compaction levels may reach up to 45%.
Keywords : Irrigation management, Alternate furrow irrigation, Soil compaction, Soybean, Nitrogen level