comportamento do girassol em relação a acidez do solo sunflower response to soil acidity conditions

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ID: 241349
1985
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Abstract
Em solo Podzólico Vermelho-Amarelo, foi instalado, no ano agrícola de 1981/82, um ensaio de rotação de culturas envolvendo milho, soja, mucuna-preta e girassol. Doze parcelas foram plantadas com girassol: algumas apresentaram germinação baixa, parte aérea pouco desenvolvida e com clorose generalizada nas folhas; sistema radicular com raiz pivotante encurvada e ramificações secundárias pouco abundantes e grossas. As produções variaram conforme a intensidade desses sintomas. Com os resultados da análise de solo de cada parcela, obtiveram-se relações lineares entre produção de grãos de girassol e pH (r = 0,95) e saturação em bases do solo (r = 0,92). Obtiveram-se ainda outras relações, também lineares, entre altura de plantas, diâmetro dos capítulos e os índices de acidez do solo. Os resultados mostraram que o girassol também foi sensível à acidez do solo e que o critério do alumínio trocável, para a recomendação de calagem, não foi o mais adequado para esta planta.
A crop rotation experiment involving corn, soybean, sunflower, and green manure was carried out in a Red-Yellow Podzolic soil. In some of the 12 plots with sunflower the seed germination was poor and the plants showed reduced growth, with leaf chlorosis, curved main roots, and fewer and thicker secondary roots. Yield was negatively correlated with the intensity of these symptoms. The grain yield was highly correlated with soil pH (r = 0.95) and soil base saturation (r = 0.92). Plant height and head diameter also showed linear relationship with those soil indices. The results obtained show that sunflower is very sensitive to soil acidity, and that the exchangeable aluminum criterion is inadequate for determining lime requirement for sunflower.
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Authors ;Maria Regina Gonçalves Ungaro;José Antonio Ouaggio;Paulo Boller Gallo;Sonia Carmela Falci Dechen;Francisco Lombardi Neto;Orlando Melo de Castro
Journal revista espanola de salud publica
Year 1985
DOI
10.1590/S0006-87051985000100004
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051985000100004
Keywords
helianthus annuus sunflower liming soil acidity saturação em bases

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