به گزيني مديريت آبياري تكميلي و بهينه سازي نيتروژن براي گندم ديم

Optimal supplemental irrigation management and optimization of nitrogen for rainfed wheat variety

Improving water productivity is vital to sustain and improve crop production in Iran. A split plot trail (RCBD) was conducted in Maragheh agricultural research institute (DARI) over three seasons in 1999-2002 to examine the effect of applying different levels of supplemental irrigation and nitrogen rates on grain yield of Sabalan rainfed wheat variety. The treatments included four levels of supplemental irrigation (rainfed, 1 / 3, 2 / 3 and Full Supplemental Irrigation) and five N rates (0, 30, 60, 90 and 120 kg.N.ha-1). Yields of rainfed conditions varied with seasonal rainfall and its distribution, with two factors having significant effects. With irrigation, crop response was generally significant up to 60 kg.N.ha-1, while optimum response for rainfed conditions was until 30 kg.N.ha-1. Optimum level of supplemental irrigation was with 1 / 3 of full supplemental irrigation was obtained maximum water productivity (WPI) and good yields. The WPI+P and WPI for this treatments (1BF.ST, N60) averaged over the three seasons were 7.4 and 30 kg. mm-1.