SOIL Studies

SOIL Studies

2016, Vol 5, Num, 2     (Pages: 059-064)

Irrigation and Nitrogen Fertigation Strategies Providing the Maximum Net Return and Water Productivity for Second Crop Silage Corn

Ramazan YOLCU 1 ,Neşe ÜZEN 2 ,Öner ÇETİN 2

1 Devlet Su İşleri 10. Bölge Müdürlüğü, Diyarbakır
2 Dicle Üniversitesi Ziraat Fakültesi Tarımsal Yapılar ve Sulama Bölümü, Diyarbakır

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The objective of this study was to evaluate the effects of nitrogen fertigation and irrigation regimes of silage corn on net return and water productivity. The experiment was carried out using grown second crop silage corn in Diyarbakır from 2011 to 2012. The experimental design used split-plots in randomized blocks with three replications. The main plots contained four different rates of irrigation water (IW) and Class A pan evaporation (CPE); I1: 0.50, I2: 0.75, I3: 1.00 and I4: 1.25. In subplots; N1: Application of twofifths of the total N when the plant height became about 6-7 leaves and the last two-fifths of it when the plants entered the stage of tasseling; N2: Application of N applied at each two irrigation cycles for 10 days, and N3: Application of N applied at each irrigation cycle for 5 day. One-fifth of the total N was applied to the soil at sowing in all treatment regimens. Increasing amount of water applied and fertigation frequency significantly increased fresh yield of silage corn in both two experimental years. According to the optimum conditions, the most appropriate irrigation scheduling and nitrogen fertigation were application of irrigation water (447 mm) consisting of 100 % cumulative evaporation from Class A pan (Ep) and equal amounts of nitrogen at each irrigation cycle (5 days). For this treatment, the fresh silage corn yield was 87.9 t ha-1. The maximum water productivity or irrigation water use efficiency, net return per unit area and net return per volumetric water were 19.6 kg da-1 m-3, 305.4 TL da-1 and 1.78 TL m-3, respectively.

Keywords : Drip irrigation, fertigation, net return, silage corn, water productivity