Estado nutricional, produção de forragem e de colmos industrializáveis pela RB867515 em área de adubação verde ou pousio

Abstract

Several managerial and agricultural tecniques have been proposed for the implantation and management of sugarcane fields, aiming at high productivity for the cane-plant cycle and small decreases in regrowth. Green manuring with sunn hemp is one of these techniques. Thus, the onjective of the presente study was to evaluate in a small rural property, in the edaphoclimatic environment of mercês, wood zone Mineira the accumulation of dry matter and nutriente cycling by sunn hemp and by plants in the fallow field, on the nutritional status, the production of forage and industrializable stems using the RB867515 variety. In setember, limestone and gypsum were Applied based on the results of soil samples in the 0 to 20 cm and 20 to 40 cm layers. Then the soil was plowed and harrowed. At the beginning of october, right after the first rains, the study was installed, consisting of na zone with sunn hemp sowing and another fallow fields. At the beginnig of february of the year following sowing, the accumulation of dry matter and nutrientes in the aerial parto f sunn hemp and in the plants in the fallow zone was evaluated. Subsequently, sunn hemp and vegetation from the fallow zone were incorporated into the soil, followed by planting RB867515. In january of the year following planting, the nutritional status of the sugarcane was evaluted in the zone previously cultivated with fertilizer and in the fallow zone, systematically sampling at seven points in the crop. In july, When the sugarcane was mature, the production of forage and industrializable stems was evaluated,sampling in the same places used for the evaluation of the nutritional status. The results ontained were subjected to Analysis of variance and means compared by the test 5% probability. Crotalaria juncea cultivation resulted in greater. Nutriente cycling than the vegetation in the fallow zone, especially for nitrogen. At the difference was observed in the nutritional status of RB867515, comparing the plants from the zone previously cultivated with sunn hemp and those from the fallow zone, both of which were well nourished. Green manuring with sunn hemp increased forage production and stem production. In the zone formerly with crotalária jucea the palnt’s aerial biomas production was 20:30 more than in the fallow zone. For the productio of industrializable stalks, green manure increased production by 16.7t per hectare.

Keywords: Family farming, dairy farming, production system, sustainability.