Produtividade e qualidade de mandioca, com adubação verde e aplicação de ácido húmico, em solo tropical propenso a coesão

Abstract

In the soil of the humid tropics, which is subjected to a high degree of inclement weather, the greatest challenge for tropical agriculture is to avoid unsustainable practices that can lead to deforestation of fresh areas when soil nutrients are depleted. The objective of this work is to study how interactions within the alley system, aiming to evaluate the effects of the combination of legume biomass and humic acid on the soil chemical properties, organic matter content and no rents and biofortified cassava quality, in a tropical soil with low fertility, focusing on the sustainability of culture. The cassava biofortified alley cultivation experiment consisted of 10 treatments and 4 replications arranged in randomized blocks, as follows: L + C, leucaena + clitoria; L + A, leucaena + acacia; G + C, gliricidia + clitoria; G + A, gliricidia + acacia; and bare soil, all with and without humic acid. Our results confirm that legume biomass can improve as cationic bases and an organic matter in tropical soil. Under these circumstances, cassava biofortified productivity can be increased up to 60% by application of humic acid, but as negative interactions between a legume crop and biomass of species such as Acacia mangium can neutralize the positive effects of humic acid on root growth. A combination of biomass of legumes with high nitrogen release and lower antagonistic effect, such as gliricidia + clitoria, may increase starch and protein content in cassava. However, the beta-carotene content was not affected by the treatments.