Abstract
The deployment of soybean under no-tillage in degraded pasture has been a trivial practice, and the efficient and rational use of fertilizers is a decisive to its economic viability factor. The objective was to evaluate the agronomic performance of six cultivars subjected to doses of basic fertilization with NPK and straw grown on Brachiaria decumbens . The experiment was conducted in the experimental area of the State University of Mato Grosso do Sul, Unit Aquidauna. The experimental design was a randomized block design in split plot design with four replications. The plots consisted of six soybean cultivars (NA 5909 RR, M SOY 7908 RR, BMX Magna RR, BRS 245 RR, SYN 3358 RR, BMX Potencia RR) and the subplots of five doses of NPK (0, 50, 100, 200 and 400 kg ha -1 ). Were evaluated plant height, first pod height, number of ramifications per plant, mass of 1000 grains and grain yield. Increased doses of fertilizer caused a linear increase in all variables in all cultivars, being recommended for degraded pastures base fertilization with 400 kg ha -1 of NPK. The varieties BMX Power RR 3358 and RR SYN showed higher mass of 1000 grains and consequently higher grain yield.
Highlights
The main oilseed crop grown in Brazil and in the world is the soybean [Glycine max (L.) Merrill], being same source of raw material of great importance, especially to sectors of agribusiness and animal nutrition
To define the type of base fertilizer to be adopted at the time of soybean implantation should be defined considering the inherent characteristics of each cultivar and environmental conditions, because they can interfere in the expected results, such as higher grains yield, plant height and pods insertion height appropriate for mechanized harvesting (REZENDE et al, 2004; CARVALHO et al, 2011)
This study aimed to evaluate the performance of six soybean cultivars at different doses of base fertilizer on straw Brachiaria decumbens Stapf. pasture degraded on Savanna/Pantanal ecotone region
Summary
The main oilseed crop grown in Brazil and in the world is the soybean [Glycine max (L.) Merrill], being same source of raw material of great importance, especially to sectors of agribusiness and animal nutrition. The area planted with this oilseed in Brazil in 2013/14 was approximately 30 million hectares, with an increase of 8.6% compared to 2012/13. In relation to production just over 86.2 million tons of grains was obtained, an increase of 5.9% compared with 81.5 million tones produced in the harvest 2012/13 (CONAB, 2014). The Brazilian average productivity in 2013/14 was 2,900 kg ha-1, considered high in comparison to other countries (CONAB, 2014). To define the type of base fertilizer to be adopted at the time of soybean implantation should be defined considering the inherent characteristics of each cultivar and environmental conditions, because they can interfere in the expected results, such as higher grains yield, plant height and pods insertion height appropriate for mechanized harvesting (REZENDE et al, 2004; CARVALHO et al, 2011)
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