Root length and architecture of paddy rice genotypes in nutrient solution and their relationship with nutrient uptake and dry matter yield
Abstract
The obtaining of higher grain yield in paddy rice (Oryza sativa L.) is necessary to increase economic gain and to reduce enviromental impact, due to lower area demand. Yield increases can be obtained with the development of more efficient genotypes in nutrient uptake, that can be related to root morphology, architecture and distribution in soil. A greenhouse experiment was conducted, in nutrient solution, to compare genotypes IRGA 417 and IRGA 419 (modern), EEA 406 (traditional), Avaxi (hybrid, RiceTec) and Bluebelle (american) in relation to root lenght and architecture, nutrient uptake (P and K) and dry matter yield, in growth stage V 8 to V 10.IRGA 417 developed lenghter roots, while IRGA 419 and Bluebelle had shorter roots. Avaxi developed more superficial roots, while EEA 406 and Bluebelle developed deeper roots. Avaxi, with root lenght similar to IRGA 417, had greater P and K uptake and greater shoot and total dry matter yield. There was relationship between root lenght and nutrient uptake and dry matter yield, with advantage to plants with lenghter roots.
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