Author(s):

Vipul Singh, Ravi Shanker Singh, Raghvendra Singh, BN Singh and Ankit Tiwari

Abstract: A field experiment was carried out at Agronomy Research Farm of Narendra Deva University of Agriculture and Technology, Narendra Nagar (Kumarganj), Faizabad (U.P.) during Rabi season of 2013-14 to study the response of late sown wheat varieties to different phosphorus levels. Sixteen treatment combinations and consisted of four levels of phosphorus (0 kg P₂O₅ ha^-1, 30 kg P₂O₅ ha^-1, 60 kg P₂O₅ ha^-1, 90 kg P₂O₅ ha^-1) and four varieties of wheat (HUW-234, NW-2036, HD-2643 and DBW-14).The experiment was conducted in Split Plot Design (S.P.D.) with three replications on silt loam having organic carbon (3.8%), nitrogen (203 kg ha^-1), phosphorus (12.25 kg ha^-1) and potassium (265 kg ha^-1). The yield components like number of spikes per square meter, spike length (cm), number of grains spike^-1, grain yield (q ha^-1), straw yield (q ha^-1) and phosphorus uptake at harvest (kg ha^-1) were maximum under 90 kg P₂O₅ ha^-1 and among the varieties DBW-14 being at par with NW-2036. Harvest index and 1000-grain weight (g) were not influenced significantly due to phosphorus levels and varieties. The maximum net return (Rs. 50584.3 ha^-1) was obtained at 60 kg P₂O₅ ha^-1 with DBW-14 and B: C ratio 1.97 was computed with the same variety DBW-14 at 60 kg P₂O₅ ha^-1. Thus it may be concluded that phosphorus levels of 60 kg P₂O₅ ha^-1 proved as the most suitable practice for the yield potential of late sown wheat. Among the varieties DBW-14 was found most suitable for cultivation under late sown condition for achieving higher yield and economics.

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