Ziaulhaq Zia
A study was carried out in the research farm of Agriculture Faculty at for two seasons 2020/2021. The aim to study the effects of supplementary irrigation on growth and yield of Spring Wheat (Triticum aestivum L.), especially to find the effect of limited water in the time of cease rainfall. Randomized Complete Block Design (RCBD) was used and had three repeats. Five irrigation (T1 = control, T2 =one irrigation at tillering, T3 = one irrigation at an thesis, T4 = one irrigation at grain filling, T5 = three irrigation at (tillering ,an thesis and grain filling) . the plot size was 1.6× 3m consisted of 8 rows . The fertilizer dose of Nitrogen (150kg/ha-1) Phosphorus (100kg/ ha-1) was applied in the form of Urea and DAP. The variety of wheat used was Lalmi4 #. Data obtained included crop growth and yield parameters of wheat adopted for analyzing the parameters, with the supplemental irrigation treatments as plots. Supplementary irrigation significantly affected the yield, the high yields were obtained from three irrigation in tillering, a thesis and grain filling stages, whereas the lowest was obtained by the no irrigation treatment. There was slight difference effect on growth and yield components. The result of this study showed that supplementary irrigation affected the growth and yield parameters of wheat, and also it was concluded that three supplementary irrigation at (tillering, anthesis and grain filling) gave the highest yield parameter viz. spike length, number of spikelet, number of seed per spike, thousand grain weights, biological yield and grain yield compared to others.