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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Fageria, N.K., Baligar, V.C., Wright, R.J. et al. Lowland rice response to potassium fertilization and its effect on N and P uptake. Fertilizer Research 21, 157–162 (1990). https://doi.org/10.1007/BF01087425
- Lowland rice
- Oryza sativa L.
- grain yield
- soil extractable K
- K response
- K x cultivar interaction