Studies on Crop Geometry and Nutrient Management for Maize + Rice bean Intercropping System
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Date
1997
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Birsa Agricultural University, Ranchi
Abstract
For suitable planting geometry and nutrient management in saize + ricebean interoropping, a field experiment was conducted during Kharif 1996, at Birsa Agricultural University Farm, Ranchi in a Randomised Block Design replicated thrice. The experiment consists of 19 treatment combinations of maize and ricebean where maize was taken as normal, paired and skip row planting at 100 per cent of nutrients requirement and ricebean intercropped with maize at 188, 58, 25 and zero per cent of the recommended dose of fertilizers.
Results revealed that maize grown in association with ricebean in 2:3 row ratio, at 100 per cent of the recommended dose of fertilizers to both component crops, produced maximum naize grain yield (37.25 q/ha), however, it was statistically at par with maize + ricebean in 1:2 row ratio at 100 per cent of the recommended dose of nutrients to both component crops (33.19 q/ha). Maximum ricebean grain yield (12.25 q/ha) was recorded from paired row of naize alongwith ricebean in 2:3 row ratio at 100 per cent of the recommended dose of fertilizers to component crops. Maximum naize equivalent yield (51.03 q/ha) was obtained from paired row planting of maize in association with ricebean in 2:3 ratio at full dose of fertilizers to both component crops and it was significantly superior to rest of the treatments having net return of Rs. 12,367.49 ha-1 and benefit cost ratio of 1:43.
Maximum energy from economical (75,014 MJ/ha) and biological yield (1,48,421 MJ/ha) was recorded from the treatments receiving 100 per cent of the recommended dose of fertilizers to both the components crops under 2:3 row ratio. But maximum energy use efficiency (11.59 from economic yield and 26.29 from biological yield) and energy productivity (788 grain gram/MJ) were recorded from sole ricebean at zero level of fertilizer. The results are in conformity with those of Mahapatra and Pradhan (1992). Maximum Land Equivalent Ratio (LER) 2.11 was recorded from maize skip row planting alongwith ricebean in 2:5 row ratio at 25 per cent of the recommended dose of nutrients to ricebean and it was on a par with all the other combinations except normal planting of maize+ ricebean in 1:2 row ratio. where ricebean received 100 or 50 per cent of the recommended dose of fertilizers.
Maximum available nitrogen (277 Kg/ha) was recorded from maize + ricebean in 1:2 row ratio. where ricebean was fertilized with 50 per cent of the recommended dose of nutrients. However, maximum available phosphorus (54.23 Kg/ha) and potash (218.67 Ks/ha) were recorded from normal planted maize alongwith ricebean in 1:2 row ratio at 100 per cent of the recommended dose of fertilizers to both the component crops.