Scientific Electronic Archives (Oct 2018)
Forms of nitrogen fertilization on soybean in the northern of Mato Grosso State, Brazil
Abstract
This study aimed to verify the effects of soil and foliar application of N in different growth stages of two soybean cultivars in the Northern of Mato Grosso State, Brazil. The experimental design was randomized complete block design with four replications in factorial scheme 2 x 7. The soybean cultivars were: TMG 132 and TMG 1179. The treatments were: control (without N fertilizer), 20 kg of N applied in the furrow at sowing, 20 kg of N applied on the soil surface at sowing time, 20 kg of side dress N applied in V2 on the soil, 20 kg of side dress N applied in V4 on the soil; 20 kg of N applied via foliar in V2 and lastly 20 kg of N applied via foliar in V4. The N in the soil, even at sowing, reduces nodulation of soybean plants, generating small gains in productivity. The application of 20 kg N ha-1 starting in V2 stage increases vegetative growth, nodulation and soybean yields. Foliar application of N at a dose of 20 kg ha-1 in V2 or V4 stages is the most efficient way to increase soybean productivity.