INTERACTIONS BETWEEN GREEN MANURE AND ROCK PHOSPHATE ON SOIL NUTRIENT CYCLING ON FAMILY FARMS

ABSTRACT Family farming is important for the production of food human consumption, but it lacks resources to invest in soil fertility its crops. The objective this study was analyze whether use green manures increases terms nutrients N, P and K with low environmental risk family agricultural production. An experiment set up State Mato Grosso (Brazil), randomized complete block design, a 6 x 3 factorial scheme, four replications, corresponding types plants doses phosphorus. Leguminous manure were: velvet bean, Crotalaria juncea, ochroleuca dwarf pigeon pea, addition plots pearl millet weedy fallow control. Rock phosphate (i.e., reactive natural phosphate) applied as source phosphorus at 0, 50 100 kg P2O5 ha-1. species used were cut full bloom levels P, C determined. plants, after mineralization, increased stocks soil. juncea one that reached highest N accumulation constitution, being recommended intercropping C/N ratio > 30 minimize risks contamination nitrate This work concluded managements especially ochroleuca, are environmentally safe technical alternatives farming.