Abstract
Soils with improved fertility indicate opportunities for more rational use of fertilizers. The objective of this study was to evaluate the management of potassium fertilization in the succession of soybean-corn in soil with improved fertility, in the southwestern region of the state, Goiás. The experiment was set in 5×3 factorial scheme, arranged in randomized blocks with four repetitions. The treatments consisted of the combination of potassium doses (0, 40, 80, 120 and 160 kg ha-1 of K2O) and seasons of application (100% of the dose in pre-planting, 100% of the dose in coverage and in installments with 50% of the dose in pre-planting + 50% in coverage). The best performance of soybean, considering grain yield, was obtained with the parceled application of 80 kg ha-1 of K2O, with production of 3.6 Mg ha-1. The highest corn production was obtained with the anticipated application of 160 kg ha-1 of K2O in soybean. In the management of potassium fertilization in improved fertility soil in the soybean-corn succession, the parceled application of 120 kg ha-1 of K2O kept the available K reserve in the soil constant when compared to its initial content.
Highlights
The soybean production chain (Glycine max (L.) Merrill) is one of the most important economic segments of Brazilian agribusiness (CONAB, 2017)
Considering primary production alone, soybean accounts for about 51.8% of national grain production (USDA, 2016). Much of their success is related to the incorporation of technology in the production process, among which stands out the no-tillage system, which is the seeding process without soil disturbance, straw maintenance and rotation of cultures
Among the main species used in rotation and succession are corn (Zea mays), which, as a little harvest, has consolidated itself in recent years by the significant increase of 63.5% in planted area and, 36.5% in productivity, consolidating the no-tillage system in the soybean-corn succession (Pauletti et al, 2010)
Summary
The soybean production chain (Glycine max (L.) Merrill) is one of the most important economic segments of Brazilian agribusiness (CONAB, 2017). Considering primary production alone, soybean accounts for about 51.8% of national grain production (USDA, 2016). Much of their success is related to the incorporation of technology in the production process, among which stands out the no-tillage system, which is the seeding process without soil disturbance, straw maintenance and rotation of cultures. In this way, the cultivation of earlier soybean varieties opened the opportunity for the cultivation of a second crop, common in the Cerrado region (Guareschi et al, 2008). Soybean and corn together account for 87.13% of total grain production in Brazil (CONAB, 2016a)
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