Paddy pulse cropping system for sustaining soil health and rice yield in Cauvery command area.

摘要

Field experiment was conducted from 1992 to 2003 at Zonal Agricultural Research Station, V. C. Farm, Mandya, Karnataka to study the beneficial effect of pulses on soil fertility and sustainability of rice yield in paddy-pulses cropping system in Cauvery command area. The mean 10 years' research results revealed that growing pulses after or before rice in rice-pulses sequence recorded maximum grain yield (5375 to 5550 kg/ha) as compared to rice-rice cropping system (5160 kg/ha). Improvement in organic carbon (0.54-0.56%), CEC (10.10 to 10.50 cmol/kg), porosity (29.80 to 35.30%) and maximum water holding capacity (28.90 to 30.90%), and drastic reduction in bulk density (1.35 g/cc) was observed with rice-pulses cropping system as compared to rice-rice cropping system (0.32%, 9.60 cmol/kg, 26.50%, 21.20% and 1.67 g/cc, respectively). Available soil nutrient status (kg/ha) was rice-pulses cropping system (288 N, 65 P2O5, 134 K2O, 26.70 S and 0.80 Zn) as compared to rice-rice sequence (118, 53, 73, 10.10 and 0.16 kg/ha, respectively). Water use efficiency was maximum with rice-pulses cropping system (55 kg/ha-cm) as compared to rice-rice system (24 kg/ha-cm) and maximum benefit:cost ratio was obtained with rice-Avare cropping system (Rs. 3.04) as compared to rice-rice system (Rs. 2.29).