Author(s):

Sachin Singh, Tejbal Singh, Anurag Kumar Singh and Ramesh Kumar Singh

Abstract: The influence of rate of N application and PGRs on Wheat (Triticum aesitivum L.) morphogenesis, yield and economics was studied under field condition at Agricultural Research Farm of Institute of Agricultural Sciences, B.H.U-Varanasi in Rabi season of 2015-16. The experiment with twelve treatments consisted of four nitrogen levels (0, 150, 180, 220 kg N ha^-1) as alone and in combination with two PGRs spray namely Chlormequat chloride applied as single @ 0.2% at 45 DAS and in combination with Tebuconazole as Chlormequat chloride @ 0.2% at 45 DAS followed by Tebuconazole @ 0.1% at 70 DAS. Nitrogen rates significantly affected growth characters, lodging, yield and economics as alone and in combination with PGRs, each treatment was replicated thrice in completely randomized block design. The results revealed that, higher plant height, tiller number, leaf area index, dry matter and lodging value recorded with higher dose of nitrogen i.e. 220 kg N ha^-1 but higher grain yield, HI and gross return was obtained with marginally higher nitrogen rate i.e.180 kg N ha^-1 while higher straw yield, net return and B:C ratio with optimum nitrogen rate i.e. 180 kg N ha^-1. PGR treatments significantly reduced plant height, leaf area index, increased tillering, and dry matter accumulation. They had significant effect on lodging score even at higher nitrogen rates and had obvious effect on the final yield and economics. The combined application of two sprays of Chlormequat chloride and Tebuconazole at different rates of N significantly reduced plant height, LAI, dry matter and lodging score as well as increased tiller number over nitrogen rates alone and insignificant to nitrogen with two sprays of Chlormequat chloride. In overall, application of 180 kg N ha^-1+ Chlormequat chloride+Tebuconazole recorded higher grain yield (48.37 q ha^-1), harvest index (40.52), gross return (116376.25 ha^-1), cost of cultivation (34212 ha^-1), net return (82164.25 ha^-1) and B:C ratio (2.40) while, 150 kg N ha^-1 recorded maximum straw yield (73.45 q ha^-1. However, treatment T₁₀: 150 kg N ha^-1+ Chlormequat chloride+Tebuconazole recorded maximum B:C ratio (2.42), considered to be most remunerative for wheat cultivation in farmer’s perspective but at marginally increased nitrogen i.e. 180 kg N ha^-1+ Chlormequat chloride+Tebuconazole have certain grain quality significance as well as maintains nitrogen balance in soil, preferred for cultivation.

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