Author(s):

HP Verma, OP Sharma, LR Yadav, SS Yadav, AC Shivran, Rajesh Kumar and Balwan

Abstract: A field experiment was conducted under loamy sand soil during two consecutive rabi seasons of 2014-15 and 2015-16 at S.K.N. College of Agriculture, Jobner, Rajasthan study to the effect of irrigation scheduling and organic manures on growth, yield and quality of wheat. The treatments consisted of five irrigation scheduling i.e. I₁ (irrigation at critical stages), I₂ (0.9 IW/CPE ratio), I₃ (0.6 IW/CPE ratio at vegetative phase + 0.8 IW/CPE ratio at reproductive phase), I₄ (0.6 IW/CPE ratio at vegetative phase + 1.0 IW/CPE ratio at reproductive phase) and I₅ (0.8 IW/CPE ratio at vegetative phase + 1.0 IW/CPE ratio at reproductive phase) in main plots and four organic manures (control, FYM @ 15 t/ha, VC @ 6 t/ha and FYM @ 7.5 t + VC @ 3 t/ha) in sub plots were replicated four times in split plot design. The pooled data results showed that irrigation applied at 0.9 IW/CPE ratio (I₂) recorded the maximum values of growth indices (matter accumulation per metre row length, leaf area index, leaf area duration, crop growth rate, relative growth rate and net assimilation rate) and yield (grain, straw, biological and HI) proved significantly superior over I₁, I₄ and I₃ except treatment I₅. Results further indicated that application of FYM at 7.5 t + VC at 3 t/ha (M₃) recorded significantly higher growth indices (matter accumulation per metre row length, leaf area index, leaf area duration, crop growth rate, relative growth rate and net assimilation rate), yield (grain, straw, biological and HI) and being at par with M₂ proved superior over rest of the treatments. Scheduling of irrigation to wheat either at 0.9 IW/CPE ratio throughout the growth or 0.8 IW/CPE ratio at vegetative phase + 1.0 IW/CPE ratio at reproductive phase brought about significantly higher growth indices and yield (grain, straw and biological). So far as saving of irrigation water is concerned, irrigating the crop with 0.8 IW/CPE ratio at vegetative phase + 1.0 IW/CPE ratio at reproductive phase was most effective as the above schedule besides producing almost equal yields also curtailed one irrigation with highest water use efficiency.

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