21. Effect of nitrogen on pigeonpea (cajanus cajan) and rice (oryza sativa) intercropping system.
Indian J. of Agric. Sc., 60, 1990, pp. 519-522
An experiment was conducted under rainfed situation to assess the legume advantage under varying levels of N in a pigeonpea [Cajanus cajan (L.) Millsp.] - rice (Oryza sativa L.) intercropping system.
The experiment was conducted during the rainy seasons in a randomized block design with 4 replications in the rainfed upland. The soil was lateritic with a sandy -loam texture.
N was applied through urea 30, 45, 60 and 75 kg/ha. Of the total N applied, 10 kg/ha was given in lines uniform to all the treatments at sowing along with 18 kg P/ha and 17 kg K/ha. The remaining amount of N for each treatment was top-dressed to rice in 2 equal splits, at 20 and 40 days after sowing. The sole pigeonpea received a fertilizer dose of 28, 18, 17 kg N, P, K/ha at the time of sowing.
The land-equivalent ratio was calculated for each fertilizer N level by adding the proportion of rice yield in the intercrop to that in the sole crop with the proportion of pigeonpea yield in the intercrop to yield of sole pigeonpea. The energy input and energy output were also calculated.
The transfer of N during the rice-growing period from pigeonpea to rice was negligible. Application of 30kg N/ha to rice in the intercrop gave the optimum economic return. This could recover 59 and 90% of the grain yields of sole rice and pigeonpea with an yield advantage of 49%, net profit of Rs 4432, energy output of 129400 MJ/ha, and energy output-input ratio of 16.59. Sole rice was an inefficient user of energy input.
It can be concluded that pigeonpea can adjust well with rice in the rainfed upland in an intercropping system at different levels of N.
Optimum economic returns with high energy-use efficiency were observed when only 30 kg N/ha was applied to rice in the intercropping system.
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Africa, Togo, cropping practices, cotton, yield, smallholder, production systems, extension, research topics
COUSINI+, P. and K. DJAGNI
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