dc.contributorUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:25:27Z
dc.date.available2014-05-20T15:25:27Z
dc.date.created2014-05-20T15:25:27Z
dc.date.issued2001-01-01
dc.identifierNutrient Cycling In Agroecosystems. Dordrecht: Kluwer Academic Publ, v. 59, n. 2, p. 143-149, 2001.
dc.identifier1385-1314
dc.identifierhttp://hdl.handle.net/11449/35878
dc.identifier10.1023/A:1017555023168
dc.identifierWOS:000170945300005
dc.identifier5720775873259528
dc.identifier0000-0003-2001-0874
dc.description.abstractThere is a lack of long-term research on potassium fertilization for soybean in the tropical and subtropical soils of Brazil and the residual effect of the fertilizer has generally not been considered. An experiment was conducted in plots that had been fertilized with 0, 40, 80, 160 and 240 kg ha(-1) of K2O for 3 years on a Dark Red Latosol, loamy sand (Acrortox). The effects of annual or residual fertilization with those rates of K were studied for three additional years. Potassium was supplied as potassium chloride or potassium sulphate. Soil and leaf samples were taken annually. There was a residual effect of the nutrient, which provided for high yields up to the 3rd year with the highest rate of K. In order to maintain the K contents of the soil in the medium range and obtain at least 90% of the maximum grain yield, an annual application of 80 kg ha(-1) of K2O was necessary, irrespectively of the source. The highest soybean yields were always associated with K levels above 15 mg kg(-1) in the leaves and 1.2 mmol(c) dm(-3) in the soil.
dc.languageeng
dc.publisherKluwer Academic Publ
dc.relationNutrient Cycling in Agroecosystems
dc.relation2.105
dc.relation0,895
dc.rightsAcesso restrito
dc.sourceWeb of Science
dc.subjectexchangeable potassium
dc.subjectfoliar diagnosis
dc.subjectGlycine max
dc.subjectpotassium sources
dc.titleResidual and annual potassic fertilization for soybeans
dc.typeArtículos de revistas


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