Desempenho operacional de uma semeadora-adubadora de precis?o, em fun??o do preparo do solo e do manejo da cobertura de inverno

摘要

The field operation performance of a precision grain drill with six lines spaced of 550 mm was evaluated in a very loamy soil, classified as Nitossolo Vermelho Distrófico Latossólico for bean (Phaseolus vulgaris L.) seeding. The treatments consisted of three tillage systems: a) conventional (primary tillage plowing with disk plow and twice harrowing with tandem disk harrow); b) chiseling (tillage with chisel plow combined with roller, and c) no tillage. Those procedures were combined with four conditions of soil covering in winter time (consortium oat + turnip managed with cutting-roller, straw-crusher, herbicide and discovered soil). The tillage systems and the soil covering management were replicated on three consecutive years. The values of force and pick of traction force in the bar, skating of the wheeled and consumption of fuel were bigger in the chiseling tillage management related to the ones obtained in the conventional tillage and no tillage. The effective field capacity was bigger in no tillage system related to the other treatments. The management in the winter cover crop and the discovered soil didn't influence any one of the variables.