Atributos químicos de um latossolo vermelho-amarelo sob sistemas integrados de produção agropecuária

Abstract

In Brazil, the integrated agricultural production systems have been shown to be one of the best forms of recovery of degraded pasture areas, however, there are few studies evaluating the integration and productivity of upland rice in this system, either due to fertility soil after use of forage as preceding crop. Given the above, aimed to evaluate the spatial variability of chemical attributes of an Oxisol and performance of upland rice, inserted on different cover crops, which were the treatments T1: cowpea (Vigna unguiculata ) and pasture (B. ruziziensis) consortium; T2: crotalaria (Crotalaria ochroleuca) and pasture (B. ruziziensis) consortium; T3: Sudan grass (Sorghum sudanense) and pasture (B. ruziziensis) consortium which were assessed productivity, mass hundredfold, number of tillers, panicle number and stain severity score of rice grain and soil were evaluated pH in water and pH potassium chloride, calcium, magnesium, potassium, bases amount more aluminum hydrogen, base saturation and CEC to layers 0 to 0.10 and 0.10 to 0.20 m. For it was adopted a rectangular grid with 100 sampling points with a total of 26400 m² area of study. The attributes of the soil and the plant were placed in separate main components, however, the spatial distribution of calcium and severity spots were directly correlated with productivity. The calcium content to 3.90 cmolc dm-3provided yields of up to 3.11 Mg ha-1, while the spots severity note restricted productivity up to 0.69 Mg ha-1. Cowpea consortium (Vigna unguiculata) and pasture (B. ruziziensis) was presented as the best option for cultivation predecessor to the upland rice.