USO DE CALCÁRIO AGRÍCOLA, GESSO AGRÍCOLA E CAL HIDRATADA AGRÍCOLA EM SISTEMA AGROPASTORIL NO NOROESTE PAULISTA: EFEITOS NA CULTURA DO MILHO.

The objective of this work was to evaluate the effect of the application of agricultural lime, agricultural gypsum and agricultural hydrated lime on the agronomic characteristics of the maize crop, cultivated in agropastoral system, under the edaphoclimatic conditions of the Northwest region of São Paulo State, Brazil. The parameters evaluated in the maize crop were: height of insertion of the first cob, height of plants, final stand ha-1, number of cobs ha-1, mass of one hundred grains and grain productivity. The experimental design was a randomized block with seven treatments (T1: standard treatment: without the use of agricultural limestone, agricultural gypsum and hydrated agricultural lime and no tillage; T2: agricultural limestone and agricultural gypsum on the surface in first year and agricultural limestone on the surface in second year; T3: agricultural limestone and agricultural gypsum incorporated in first year and both on the surface in second year; T4: agricultural limestone incorporated in first year and on the surface in second year; T5: agricultural hydrated lime and agricultural gypsum on the surface; T6: hydrated lime on the sub surface, at a dose of 450 kg ha-1 and agricultural gypsum on the surface in first year and hydrated agricultural lime on the surface in second year; T7: hydrated agricultural lime on sub surface, at a dose of 260 kg ha-1 and agricultural gypsum on the surface in first year and hydrated agricultural lime on the surface in second year) and four replications. The data were submitted to the F test and the means were compared by the Tukey test (p <0.05). It was verified that the application of agricultural hydrated lime at a dose of 260 kg ha-1 along the soil profile, associated to the use of agricultural gypsum on the surface and the application of hydrated agricultural lime on the surface in the following year resulted in a higher corn grain productivity and that soil tillage for the incorporation of agricultural limestone and agricultural gypsum in the previous year compromised the grain productivity of the maize crop. [ABSTRACT FROM AUTHOR]