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

Abstract

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.