Lowland rice response to potassium fertilization and its effect on N and P uptake |
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Authors: | N K Fageria V C Baligar R J Wright J R P Carvalho |
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Affiliation: | (1) Contribution from the National Rice and Bean Research Center of EMBRAPA, Caixa Postal 179, 74000 Goiania, GO, Brazil;(2) Appalachian Soil and Water Conservation Research Laboratory, USDA-ARS, P.O. Box 867, Beckley, WV, USA |
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Abstract: | Not much is known about the response of lowland rice to K fertilization under Brazilian conditions. A field experiment was conducted during four consecutive years to determine the response of three lowland rice (Oryza sativa L.) cultivars to K fertilization on a Low Humic Gley soil. In the first two years, K was broadcast at rates of 0, 42, 84, 126, and 168 kg K ha–1. In the last two years K rates were reduced to 0, 25, 50, 75, and 100 kg K ha–1 and applied in a band. Potassium significantly (P < 0.01) increased grain yields but the response varied from cultivar to cultivar and year to year. Yield responses to K fertilization were superimposed on a general trend of increasing grain yields across the four growing seasons. Mean grain yields increased 14.3% with broadcast application of K in the first two years and 10.4% with banded application of K in the last two years when compared to the control treatments. Extractable soil K increased with K application rate and decreased with soil depth. Potassium was rapidly removed from the soil and yearly broadcast or banded application of K can be expected to result in a significant increase in grain yield of lowland rice in these soils. |
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Keywords: | Lowland rice Oryza sativa L K-concentration grain yield soil extractable K K response K x cultivar interaction |
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