02165naa a2200337 a 450000100080000000500110000800800410001902400280006010000190008824501100010726000090021752012040022665000160143065000140144665000260146065000090148665000100149565000120150565000170151765000140153465300260154865300210157465300320159565300290162765300170165665300280167370000190170170000180172070000230173877300660176111978762020-06-24       1990    bl uuuu     u00u1 u    #d7 a10.1007/BF010874252DOI1 aFAGERIA, N. K.  aLowland rice response to potassium fertilization and its effect on N and P uptake.h[electronic resource]  c1990  aNot much is known about the response of lowland rice to K fertilization under Brazilian conditions. A field experiments 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 &lt 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.  aGrain yield  aPotassium  aPotassium fertilizers  arice  aArroz  aCerrado  aOryza Sativa  aPotássio  aAdubação potássica  aArroz de várzea  aConcentração de potássio  aK x cultivar interaction  aLowland rice  aPotassium fertilization1 aBALIGAR, V. C.1 aWRIGHT, R. J.1 aCARVALHO, J. R. P.  tFertilizer Research, Dordrechtgv. 21, p. 157-162, Jan. 1990.