Photosynthetic efficiency measurements of intercrop and monoculture plantings of rice and corn
1977
Isara Suksathan
Field experiments were conducted for two seasons to study the physiological responses to varying plant populations and row spacings of rice and corn in monoculture and intercrop plantings. The lowering of dry matter production of rice over the entire growing period in intercrops having high corn population was shown through decreasing leaf area index, net assimilation rate and crop growth rate. Intercrops with corn suppressed the growth of rice probably through shading and competition for growth resources. Corn yield increased with a corresponding increase in corn populations both in monoculture and intercrops. The increase in leaf area index resulted in increased crop growth rate. Dry matter production subsequently increased though net assimilation rate decreased. The period of overlap of reproductive stages of both rice and corn caused a high rate of competition and subsequently a reduction in yield of each crop. The compatibility of rice and corn in intercrop combinations resulted in higher total yield as compared to monoculture plantings. The early rapid growth of corn as the result of high productive efficiency early in the season and a high rate productivity late in the season from rice resulted in this yield advantage of the intercrops.on from rice resulted in this yield advantage of the intercrops.
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