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On-line version ISSN 1678-4596
CERETTA, Carlos Alberto et al. Corn grain yield, dry matter and accumulation of nitrogen, phosphorus and potassium in a black oat/corn/ oilseed radish rotation after application of pig slurry. Cienc. Rural [online]. 2005, vol.35, n.6, pp. 1287-1295. ISSN 1678-4596. http://dx.doi.org/10.1590/S0103-84782005000600010.
Pig slurry is widely used as a nutrient source for crops or cover crops but the amount to be applied depends on the efficiency of use by plants. This work aimed at evaluating the efficiency of plants used in typical crop succession in Brazilian areas of pig production to accumulate nutrients from pig slurry application. Application of 0, 20, 40 and 80m3 ha-1 before seeding of each species was done. The most efficient dose for corn grain yield and dry matter production of black oat was estimated as 85m3 ha-1. This large amount and the linear increase in the accumulation of N, P and K suggest that its use may raise operational, economical and environmental issues. Oilseed radish was particularly efficient in nutrient cycling. The apparent percent recover of nutrients by corn (K>N>P) indicated that conservation practices should be applied to avoid losses.
Keywords : manure; animal waste; organic fertilizer.