Correção e condicionamento do solo, com aplicação de mistura de calcário e gesso para crescimento da Urochloa brizantha cv. Marandu

Abstract

The objective of the present work was to evaluate the effect of superficial applications of concealers with different granulometries and formulations on the development of Urochloa brizantha cv. Marandu and soil chemistry. The experiment was installed in a greenhouse at University of Oeste Paulista (UNOESTE), Campus II, in the municipality of Presidente Prudente - SP. The treatments of the present experiment were carried out in polyethylene pots with a capacity of 30 kg filled with argisol and corrected according to the technical information of recommendations for interpretations of soil analyzes, according to Bulletin 100.A completely randomized experimental design was adopted, with superficial applications of corrective agents: T1 - Dolomitic limestone (PRNT 91); T2 - Dolomitic limestone (PRNT 91) overlaid with agricultural plaster; T3 -Mixed Mineral Concealer (PRNT 65); T4 - Mixed and Micronized Mineral Concealer (PRNT 80) and T5: Control. Both with 05 repetitions, totaling 25 experimental units. After planting U. brizantha cv. Marandu, the first collection of the aerial part of the forage was carried out 45 days after the emergency and three more collections in periods of 30 days, totaling four cuts of the aerial part, for the analysis of growth (height) and development (weight of the matter of the fresh and dry aerial part); as well as leaf tissue analyzes and soil samples were also collected for chemical soil analysis (pH, H + Al, Al, P, S, K, Ca, Mg).It was concluded that the application of the correctives in the soil neutralized the Al3+ in the layer of 0-10 cm and the correctives that contained gypsum in its composition significantly increased the sulfur contents in the first soil sampling, while the treatments that contained in its formulation limestone with higher PRNT provided the soil with higher amounts of Ca and Mg, as well as increased the pH in the surface layer. Except for Ca in the fourth leaf sampling, in the other seasons, the chemical analysis of plant tissue, treatments T1 and T2 showed the best results regarding the mineral nutrition of forage U. brizantha cv. Marandu.