Efeito da aplicação nitrogenada suplementar tardia na cultura da soja cultivada em latossolos do cerrado

Abstract

The objective of this work was to evaluate the effect of late application of (N) nitrogen via leaf at the phenological stage (R5), beginning of grain filling, interferes with productivity and dry matter weight. The study was carried out at Chapada do Céu Farm located in Sebastião Leal - PI, in Yellow Latosol, in the no - tillage system. The variety to which the experiment was conducted was the FT4280 IPRO (medium cycle 100 -115). The experiment was conducted in a completely randomized design with two treatments and six replications: T1 - Standard inoculation (PI) with Bradyrhizobium japonicum + Potamol 100 ml.ha-1 + MS-mn20RR 300 g.ha-1 + 300 g .ha-1 + Kymon Plus 300 ml.ha-1, at V6 phenological stage, which was the control and T2 - Standard inoculation (PI) with B. japonicum, + Potamol 100 ml.ha-1 + MS-mn20RR 300 g .ha-1 + Kymon Plus 300 ml.ha-1 at stage V6 + N32 in dose 2.7 L.ha-1 in R5. Data were evaluated by analysis of variance and F test (Fisher) at 5% probability. In the yield evaluation T1 treatment presented 3,938.27 kg.ha-1 and T2 treatment 4074,07 kg.ha-1, in the dry matter weight evaluation T1 was 8,382.07 kg.ha-1 and T2 , 8,643.79 kg.ha-1, they did not differ statistically. The application of 2.7 L.ha-1 of N provided increase in productivity and dry weight, however there was an increase in production around 135.8kg.ha-1.