Desenvolvimento vegetativo do milho em função da calagem e adubação fosfatada

Abstract

The study aimed to determine the best interaction between base saturation (V%) and phosphorus in the implementation of the maize crop in the West Paulista in sandy soils. The study was carried out in a greenhouse in pots at the Faculty of Agronomy, University of Oeste Paulista, UNOESTE during the months of September 2009 to January 2010. The soil was an Ultisol typical dystrophic red-yellow. The experiment was conducted with the use of two base saturation levels, V% 40 (original soil) and 70% V (corrected with lime), as well as the fertilization of five doses of phosphorus, 0, 25, 50, 75, and 100 mg dm-3. We evaluated the phosphorus in the soil by the method of anion exchange resin method and the remainder of the match, but the plant through foliar analysis. Data were subjected to analysis of variance and adjusted linear regression equations for the effect of V%, the doses of phosphorus and the interaction between them. Treatment with lime at a dose of 100 mg dm-3 phosphate gave the highest content of soluble phosphorus in the soil. For parts which are used limestone, all doses of phosphorus was higher than the portion where it was treated with lime. Treatments that had higher phosphorus content remaining doses were 75 and 100 mg dm-3from match for treatments with and without liming. The higher the dose of phosphorus, the higher the content of the element accumulated in the dry matter. For the soils of the region, the use of limestone associated with phosphorus, it was evident that at doses between 50 and 100 mg dm-3 show satisfactory results. Liming resulted in an increase in dry matter production of corn and phosphorus soluble in the soil. The levels of phosphorus increased the levels of soluble phosphorus and phosphorus remaining in the presence and absence of liming. In the absence of liming doses increased the phosphorus content of phosphorus in the plant, while the calcium in the plant were higher with the dose of 75 mg dm-3 of P2O5 in the presence and absence of liming.