Interacción fungicidas y fertilizantes, sobre el complejo manchado de grano en arroz de secano.

Abstract

The potential of the agricultural production is limited by a group of restrictive factors, among those that stand out the nutritional deficiencies, the environmental conditions and the harmful organisms, among others. In the last years they are included in this group to the agents fitopatogens, their negative effects on the cultivations, are not only manifested by a decrease of the yields, but they also produce an accented deterioration in the quality of the grain. The objective of this investigation was to determine the existent interaction between the application of fungicides and specific programs of fertilization, on the complex of spotted of grain in rice. Two programs of application of fungicides and five programs of fertilization soils were investigated, in a design of parcels divided with three repetitions. It was sowed in arrays distanced to 30 cm, with the variety INIAP-16, in parcels of 16 m². The evaluation of stockings of the treatments was carried out with the test from Tukey to 5 % significance. The evaluated variables were: panicule longitude, macollo/m² number, panicule/m² number, number of grains for panicule, yield for hectare, the causal agent's identification, incidence and severity. The results determined that the application of a program of fungicides with Tebuconazol + Copper Sulfate together with a fertilization balanced 140-60-90 kg/ha of N-P-K, diminishes the incidence and damage of the spotted one of grain, achieving a maximum yield of 5014,3 kg/ha.