Aplicação de fontes boratadas no solo na cultura da soja e do milho no Cerrado brasileiro em diferentes classes texturais de solo

Abstract

Cerrado production of corn and soybeans depends on adequate levels of boron in the soil to guarantee high productivity. The Cerrado, as it has acidic and weathered soils, with low soil fertility, predominance of kaolinite, quartz, iron and aluminum oxides, has a low capacity to retain this chemical element. Given the above, the objective of this research was to evaluate the concentration of different borate sources in soybean and corn crops in the Brazilian Cerrado in different soil textural classes. Three boron sources were evaluated on two properties (P1) and (P2) containing an experimental area of 50 m x 100 m on each property, divided into plots of 12.5 m x 20.0 m, located in the municipality of Sinop, MT. The design used was in randomized blocks with 4 treatments and 5 replications observed in soybean and corn crops, in different soils with sandy loam (P1) and clayey (P2) textures. In the field, soybeans were cultivated in the 2021/2022 harvest, followed by corn in the 2023 harvest period. Boron levels were evaluated in the leaves and roots of soybeans and corn, in the soil (0-20 and 20-40 cm) after harvesting soybeans and corn and in corn production (cob, seed and cob). There was no significant difference between the different sources evaluated. A similarity was observed in the effects of treatments with boric acid, oxysulfate and ulexite on soybeans and corn. For the harvest/safrinha cycle in the cerrado soils, boric acid, oxysulfate and ulexite met the demands of soybeans and corn.