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Nutrient release, plant nutrition, and potassium leaching from polymer-coated fertilizer

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Nutrient release, plant nutrition, and potassium leaching from polymer-coated fertilizer

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Título Nutrient release, plant nutrition, and potassium leaching from polymer-coated fertilizer
Autor Bley, Henrique
Gianello, Clesio
Santos, Lenio da Silva
Selau, Lisiane Priscila Roldão
Abstract The increase in food consumption and limitations in food production areas requires improved fertilizer efficiency. Slow- or controlled-release fertilizers are an alternative for synchronizing nutrient availability with the plant demands, reducing losses to the environment. The aim of this study was to evaluate the efficacy of polymer-coated KCl compared with conventional KCl. The products were incubated in soil under controlled conditions to evaluate the time required for nutrient release. A greenhouse experiment was performed with corn plants in pots with loamy sand- or clay-textured soil types to evaluate plant nutrition and losses due to leaching. The K application rates were 0, 18, 36, and 54 mg dm-3. The pots were irrigated, and the percolated liquid was collected. The plants were harvested 30 days after sowing to quantify dry matter (DM) and its K content. In the incubation study, the K release from the coated fertilizer was found to be 42 % over 154 days. The data were fit to a linear function from which a period of 315 days was estimated as required for the release of 75 % of the nutrient. Meanwhile, conventional KCl releases 85 % of the K nutrient in the first 48h. In the cultivation of plants in pots, the coating reduced K losses due to leaching in the loamy sand soil; however, only the application rate of 54 mg dm-3 promoted DM production equivalent to conventional KCl. It is possible that the need for K in the early stages of corn development was not met by a coated KCl.
Contido em Revista brasileira de ciencia do solo. Viçosa. Vol. 41 (2017), [art.] e0160142
Assunto Lixiviação
Nutricao vegetal
[en] Enhanced efficiency
[en] Leaching
[en] Slow- or controlled-release
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/159371
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