Uniformidade de aplicação de um distribuidor centrífugo a taxa variada

Abstract

Centrifugal distributors are implementing machines that changed the technology of application of solid agricultural products. The objective of this study was to evaluate the uniformity of a centrifugal distributor, equipped with variable rate application system, depending on the type of treadmill and of lime applied. The trial was conducted in UFGD, Dourados, MS, Brazil, in an Oxisol. The centrifugal distributor pulled by a tractor 4 x 2 TDA was used. Uniformity of application for the types of conventional treadmills metal, and rubbe, with its smooth surface, and three application rates (1500, 2000 and 2500 kg ha -1 ), which were changed depending on the speed was evaluated metering conveyor, totaling six treatments which were applied in three replicates and tested at random manner. To evaluate the distribution of the input collectors with dimensions of 0.5 m long x 0.4 m wide x 0.15 m deep, which were covered with plastic bags to prevent to rebound material, were used. For the tests the collectors were lined up on a flat surface transverse and longitudinal form, side by side, with 20 collectors on the right side and 20 on the left side, and 15 stations, totaling 55 collectors. The method used to determine the effective width was based on the coefficient of variation (CV%) of each application. From the values ​​of analyzes of the limestone distribution profiles were assembled. The doses of the different doses were required in the area, both the rubber mat and for the metal. In the lowest dose administered (1500 kg ha-¹) a rubber mat provided the widest application, and its effective width of 13 m.