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15N‐aided investigations were conducted to ascertain the Nj fixation and the nitrogen (N) contribution by mungbean (Vigna radiata L.) and groundnut (Aracbis hypogaea L.) when intercropped with maize (Zea mays). The study involved growing seven genotypes of the above legumes with maize in alternate rows in two separate experiments. A sole crop of maize was used as the reference crop to determine N2 fixation by the 15N methodology. Significant genotypic differences in pod yield and stover N content were observed in intercropped mungbean and groundnut. The percentage N derived from the atmosphere showed a genotypic variation of 31 to 45 % (7 to 10 kg N2 fixed ha−1O in mungbean and 47 to 69 % (9 to 18 kg N2 fixed ha−1) in groundnut. Harvest index for N varied from 58 to 77 % in mungbean and 55 to 75 % in groundnut. In groundnut, the uptake of soil N was significantly affected by the genotype. Assuming that the N contribution to the soil by the helow‐ground plant parts was negligible, the removal of seeds at maturity resulted in a negative N balance in the soil in all the genotypes of mungbean. In groundnut, some genotypes produced a positive N balance in the soil. Owing to high N2 fixation capacity and low harvest index for N, groundnut showed a greater N supplementing ability than mungbean.
Journal of Agronomy and Crop Science – Wiley
Published: Aug 1, 1994
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