Intercropping of Azolla biofertilizer with rice at different crop geometry
1990
Singh, A.L. | Singh, P.K. (Central Rice Research Institute, Cuttack (India))
Intercropping of Azolla with rice transplanted in rectangular (10 x 40 cm) spacing produced greater biomass and accumulated more nitrogen in the Azolla than its intercropping in square (20 x 20 cm) spacing. The differences in biomass and N accumulations were greater in the second crop of Azolla at 50 days after transplanting (DAT) of the rice crop than in the first crop of Azolla at 30 DAT. The E-W direction of rice rows in the rectangular spacing produced greater biomass and fixed more nitrogen in the Azolla than with rice rows in the N-S direction. Growing and incorporating Azolla once before transplanting and twice after transplanting produced the highest grain and straw yields, greatest number and weight of panicles, and N uptake by rice. The application of Azolla also significantly improved the soil fertility by increasing total N, organic C and available P of the soil.
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