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Abstract
The practice of using green manure provides for the better utilization of chemical fertilizers and a lower cost of mineral fertilizers, and it promotes an increase in the soil’s biological activity. Green house experiment was conducted to evaluate the effect of different phosphorus sources and lime on pigeon pea growth and their effects as green manures on the dry matter production of green corn. The experiment was conducted in a greenhouse of the Federal University of Mato Grosso, Rondonópolis campus, from May 2011 to May 2012. Two sources of phosphorus (rock phosphate and triple superphosphate) were used with and without liming. The treatments were assigned in completele randomised design (CRD) with twelve replicates, the treatments (contro), rock phoshate and triple super phoshate with and without liming formed the bases of the experiment. The phosphorus was incorporated into the soil with 200 mg dm-3 of phosphorus (P2O5) based on the availability of phosphate in the sources, that is, triple superphosphate (44% P2O5) and rock phosphate Bayóvar (29% P2O5) and the method of lifting the base saturation of 60%. The experiment was conducted in two phases: pigeon pea variety cv. BRS Mandarim was cultured in the first one, and the corn was variety cv. AG1051 grown in the soil under the residual effect of the first culture. Liming and rock phosphate provide a greater dry mass of pigeon pea leaves. In the presence of lime, triple superphosphate increased pigeon pea shoot and root dry weight. The cultivation of corn after pigeon pea fertilized with triple superphosphate and rock phosphate in the presence of lime, induced the dry matter production of corn. Key words: Greeno fertilization, Cajanus cajan, rock phosphate, Triple superphosphate, Cerrado Oxisol.
Highlights
Phosphorus is the most limiting nutrient in biomass productivity (Corrêa et al, 2004)
The objective was to evaluate the influence of fertilization with triple superphosphate and rock phosphate with or without liming, on pigeon pea growth and its effects as green manure on the dry matter production of green corn
Through fertilization with rock phosphate and triple superphosphate observed increase of 15.26 and 13.03 g pot-1 dry weight of leaves of pigeon pea when compared with the absence of phosphate fertilizer
Summary
Phosphorus is the most limiting nutrient in biomass productivity (Corrêa et al, 2004). In Brazil, phosphorus deficiency is observed in several kids of soils, as a result of the source material of low natural fertility, high acidity, low base saturation, toxicity of some chemical elements and the strong interaction of phosphorus with the soil. The combined use of mineral fertilizers and green manure is a management practice that seeks to preserve the environmental quality without foregoing high crop yields (Arf et al, 1999) In this context, the objective was to evaluate the influence of fertilization with triple superphosphate and rock phosphate with or without liming, on pigeon pea growth and its effects as green manure on the dry matter production of green corn
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