Yield, Photosynthesis and Canopy Structure of Maize-Mungbean Intercropping System.

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The aim of this paper is to analyze the yield improvement of maize-mungbean Intercropping from the view point of canopy structure, canopy light conditions and leaf photosynthesis. Monoculture plots of maize and mungbean at each crop standard density, and intercropping plots at three densities of maize sown together with mungbean were prepared. Two rows of mungbean were sown together with one row of maize. The grain yield of maize in monoculture was about 480 g/m2, the highest maximum. There was no difference in maize yield in intercropping. Grain yields of mungbean in the low density plot and mungbean in monoculture were 68.0-82.4 g/m2, the highest maximum. Land equivalent ratio (LER) of the low density plot was 1.39, the highest value. LER in other plots was less than 1.0. LER in the low density plot was maximum because of the high yield ratio, 90%, of mungbean for inter-cropping to monoculture. Light extinction coefficient in the low density plot was similar to that of maize in monoculture compared with mungbean in monoculture. Leaf photosynthesis of both maize and mungbean in the low density plot was almost the same as that in monoculture, while in the higher density plots it was lower than in monoculture. Growth rates of both maize and mungbean at the ripening stages in the low density plot were higher than in both middle and high density intercroppings. Consequently the yield in the low density plot was higher.
日本熱帯農業学会の論文