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Provedor de dados:  Repositório Alice
País:  Brazil
Título:  Evaluation of tropical legume cover crops for copper use efficiency.
Autores:  FAGERIA, N. K.
BALIGAR, V. C.
Data:  2014-04-04
Ano:  2014
Palavras-chave:  Cobertura vegetal
Fertilizante fosfatado
Cobre
Microelemento
Raíz
Cover crops
Plant micronutrients
Root growth
Resumo:  Cover crops are important components of cropping systems due to their role in improving soil quality. Lack of adequate levels of soil micronutrients prevents the success of cover crops in highly weathered tropical soils. A greenhouse experiment was conducted with the objective to evaluate copper use efficiency of nine tropical legume cover crops. The copper levels used were 0, 5, 10 and 20 mg Cu kg−1 of soil. Shoot dry weight, maximum root length and root dry weight significantly increased in a quadratic fashion with increasing soil Cu levels in the range of 0 to 20 mg kg−1 soil. Cu x cover crops interactions for shoot dry weight, root dry weight, maximum root length and contribution of root to the total dry weight were significant, indicating different responses of cover crops with the variation in soil Cu levels. Overall, maximum shoot dry weight was obtained with the application of 13 mg Cu kg−1. Similarly, maximum root dry weight and maximum root length were obtained with the application of 12 and 14 mg Cu kg−1 of soil. Root dry weight and maximum root length were significantly and positively related to shoot dry weight, indicating that a vigorous root system is important for improving productivity of cover crops grown on Brazilian Oxisols, especially where deficiency of micronutrients such as Cu exists. The Cu concentration in the plant tissue decreased in a quadratic fashion whereas, Cu uptake increased with increasing Cu application rate from 0 to 20 mg kg−1 soil. There was a significant variation observed in Cu use efficiency among cover crop species. Increasing applied Cu levels significantly increased soil pH and Mehlich 1 extractable soil Cu, Zn, Mn and Fe concentrations in the soil solution.

2014
Tipo:  Artigo em periódico indexado (ALICE)
Idioma:  Inglês
Identificador:  32569

http://www.alice.cnptia.embrapa.br/handle/doc/983950

http://ainfo.cnptia.embrapa.br/digital/bitstream/item/100601/1/nkfbaligar.pdf

http://dx.doi.org/10.4236/ajps.2014.59136
Editor:  American Journal of Plant Sciences, v. 5, n. 9, p. 1236-1247, Apr. 2014.
Relação:  Embrapa Arroz e Feijão - Artigo em periódico indexado (ALICE)
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