Longterm Irrigation scheduling with different irrigated land modules and insitu green manuring effects on growth and yield of Sunflower in Vertisol of Malaprabha command area

A long-term field experiment was conducted during 2014-15 to 2017-18 to evaluate the interaction between different irrigated ecosystems viz., rainfed (I₁) and irrigated (I₂-0.8 IW/CPE and I₃ -0.6 IW/CPE) with different land modules (i.e., T₁ and T₂ Compartment bunding without and with sunhemp, T₃ and T₄ Broad bed furrows without and with sunhemp and T₅ and T₆ Furrows without and with sunhemp) in Sunflower. The pooled results indicated that among irrigated ecosystems, irrigation at 0.8 IW/CPE ratio recorded significantly higher sunflower (17.15 q ha^-1) as compared to rainfed ecosystem (14.19 q ha^-1). Among the land modules, broad bed furrows with in-situ sunhemp green manuring showed significant differences on sunflower yield (17.63 q ha^-1) and higher water use efficiency of 4.83 kg ha.mm^-1, respectively. Economic analysis states that, the net returns and B:C ratio were significantly influenced due to irrigation and land modules. The pooled data reveals that, irrigation @ 0.8 IW/CPE ratio recorded significantly higher net returns of Rs.26,399 ha^-1and among the different insitu moisture conservation systems, significantly higher net returns (Rs.27,864 Rs.) and B:C ratio (2.42) were recorded with the broad bed furrows with sun hemp (T₄) as compared to rest of the treatments. Among interactions, irrigation at 0.8 IW/CPE with land module broad bed furrows with sunhemp recorded significantly higher B:C ratio of 2.51.