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Physiological basis for yield advantage in a sorghum groundnut intercrop exposed to drought 2. plant temperature water status and components of yield



Physiological basis for yield advantage in a sorghum groundnut intercrop exposed to drought 2. plant temperature water status and components of yield



Field Crops Research 17(3-4): 273-288



In a replacement series intercrop of two rows of groundnut (cv. Kadiri 3) alternating with one row of sorghum (hybrid CSH-8), increases in grain and filled-pod weight per plant due to intercropping were large, especially in droughted stands. For sorghum, grain yields were 38% and 93% higher per unit row in the well-watered and droughted treatments respectively, while intercropped groundnut produced 81% more filled-pod weight per unit row than did sole stands during drought. Harvest index was larger for both species in the intercrops, by 8% and 33% in 'wet' and 'dry' sorghum, and by 12% and 68% in 'wet' and 'dry' groundnut. In groundnut, harvest index was increased in the 'wet' intercrop because individuals pods were heavier, whereas the 'dry' intercrop produced twice as many pods per plant in comparison with the sole crop. There were large differences in plant temperature and water status between 'wet' and 'dry' stands troughout the post-rainy season, but mean differences between sole crops and intercrops within each water regime were small. However, shading of groundnut by sorghum in the intercrop ameliorated to some extent the effects of high temperature and water stress, especially in the droughted stands. This was particularly important during peg production. It is suggested that less damage to flowers in the 'dry' intercrop resulted in more pegs forming pods than in the 'dry' sole crop, leading to the observed advantage in harvest index in groundnut.

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Accession: 006117820

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DOI: 10.1016/0378-4290(87)90040-2


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