Effect of Nitrogen and Soil Water Regimes on Soil-Plant-Water Relationship, Yield and Water Use Efficiency of Sorghum

Results of a field experiment on a Vertisol showed that sorghum plant maintained higher leaf water potential (Ψ leaf) as well as soil waterpotential (Ψ soil) under increasing soil moisture regimes, while they did not differ much with the nitrogen application. Leaf water potential showeda significantly positive linear relationship with soil water potential. The treatments of 50 kg N ha⁻¹ and irrigation at 0.6/w/CPE (irrigation water/cumulative pan evaporation) to rabi sorghum cultivar SPV-504 (Swati) gave higher grain yield as well as fodder yield, water use, and nitrogen use efficiencies.