National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Wheat (Triticum aestivum L.) is a highly irrigation-responsive crop and produces contrasting results under limited irrigation situations, and therefore demands judicious use of irrigation water to produce ‘more crops per drop’ (i.e more grain per mm of water). A three year field experiment was conducted to study the effects of water deficit on yield of wheat crop and their productivity functions. Three wheat varieties sown on 25th November and 20th December were tested under three different irrigation levels at various growth stages. The seasonal evapotranspiration (ET) was maximal under 25th November with five irrigations while the highest water use efficiency (WUE) was obtained under one irrigation applied at crown root initiation (CRI). With timely sown conditions, wheat WUE values varied from 14.5–14.8 kg ha-1 mm-1 for one irrigation at CRI to 11.3–11.6 kg ha-1 mm-1 under five irrigations. Under delayed sowing the values ranged from 13.0–13.1 kg ha-1 mm-1 with one irrigation to 10.7–10.9 kg ha-1 mm-1 for five irrigations. Values of the yield response factor (Ky) greater than one illustrated the sensitivity of the crop to water stress. Treatments receiving five irrigations were most sensitive (Ky = 3.52) while those receiving three irrigations were least sensitive (Ky = 1.75). The highest yield was obtained when the elasticity of water productivity (EWP) = 0, regardless of date of sowing. The lowest values of EWP were obtained under one irrigation under timely sown condition. Higher values of EWP under delayed sowing indicate that there is a scope to increase yield and WUE of the crop through better irrigation management.
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