Abstract
The main objective of this study was to evaluate the efficiency of potassium fertilizer application, as related to rate, placement (in-row, broadcast, and split topdress) and time (before sowing, at sowing, and topdressing), in a soybean, pearl millet, and cotton no-till rotation system, in a typic dystrophic Red Latosol (Hapludox), in Turvelândia, Goias State, Brazil (17 o 51’S, 50 o 18’W). The experimental design was a factorial randomized block, with 4 replications. Potassium source was KCl. Potassium was applied to soybean (0 kg ha -1 , 30 kg ha -1 , 60 kg ha -1 , and 180 kg ha -1 of K 2 O ) in the planting row or broadcasted before sowing, at sowing, or topdressed. For cotton, the K rates were 0 kg ha -1 , 60 kg ha -1 , 120 kg ha -1 , and 240 kg ha -1 of K 2 O, applied before sowing and placed in the planting row, with none or one topdressing, or split in two applications. The pre-planting cotton K was applied in the pearl millet. There was no effect of potassium fertilization on soybean yield. As a cover crop, pearl millet used, more efficiently, the 60 kg ha -1 of K 2 O rate. Results showed that the best cotton agronomic efficiency was obtained with 146 kg ha -1 of K 2 O, supplied before sowing. Results also showed positive effects of potassium fertilization on cotton fiber quality. KEY-WORDS: Glycine max ; Pennisetum ; Gossypium hirsutum ; fiber quality; agronomic efficiency.
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