Effects of four potassium doses on six sprinkler irrigated rice upland cultivars. I. Yield and yield components.
DOI:
https://doi.org/10.15361/1984-5529.2004v32n2p115-120Abstract
The effects of four potassium rates (0, 20, 30, and 40 kg/ha of K2O ) on yield components and grain yield of six upland rice cultivars (IAC-20, Carajás, Caiapó, Canastra, Araguaia, and Cirad 4) were studied. Half the dose of potassium was applied at sowing and the other half at flowering onset (50% of the plants starting panicle emission). All plots received a basic fertilization of 40 kg/ha of P2O5 (simple superphosphate), 0 kg/ha of N (ammonium sulphate) and 60 kg/ha of N (urea) 30 days after seedling emergence. Plants were irrigated with a central pivot. Potassium increased panicle length, weight of 00 grains, number of filled grains/panicle, number of empty grains/panicle, number of grains/panicle, number of panicles/m2, spikelet fertility and grain yield.Additional keywords: dryland rice; supplementary irrigation; fertilization.Downloads
Published
07/05/2008
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Animal Production
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The authors, upon submitting the manuscript, agree that if it is accepted for publication, the copyright of the work will automatically be transferred to Científica: Journal of Agricultural Sciences.Opinions and concepts contained in the article and the reliability and accuracy of the information and references presented in it are the sole responsibility of the authors.
How to Cite
Effects of four potassium doses on six sprinkler irrigated rice upland cultivars. I. Yield and yield components. Científica, Dracena, SP, v. 32, n. 2, p. 115–120, 2008. DOI: 10.15361/1984-5529.2004v32n2p115-120. Disponível em: https://cientifica.dracena.unesp.br/index.php/cientifica/article/view/75. Acesso em: 9 nov. 2026.
