Rt. Tanaka et al., EFFECT OF LIMING AND POTASSIUM ON SOYBEAN S OIL AND PROTEIN-CONCENTRATION AND YIELD, Pesquisa agropecuaria brasileira, 30(4), 1995, pp. 463-469
A study was made on the effects of potassium and liming on soybean ('I
AC-14') oil and protein. The experiment was carried out in a Dark-Red
Latosol at Mococa, during three years, in which in the last two years
the residual effect of fertilizers was studied. A split plot design wa
s used where the main plots consisted of liming (0, 3.5 and 7.0 t/ha),
and the sub-plots were of K2O (0, 150, 300, 450 and 600 kg/ha). The r
esults showed that the K fertilization increased the oil content by 2.
2 percentage points in the grains and decreased the protein percentage
in 4.2 to 6.6. Liming increased the protein content and decreased the
oil content. At the 3.5 and 7.0 t/ha of liming rate, the maximum yiel
d (MY) of oil was obtained with the K2O application between 423 to 438
and 430 to 480 kg/ha, respectively. To obtain MY of protein at 3.5 an
d 7.0 t/ha of liming rate, these doses were associated with the applic
ation of 408 to 453 and 455 to 581 kg/ha of K2O, respectively.