Viabilidade agroeconômica de rotação de culturas e manejo do solo em áreas irrigadas por aspersão

Abstract

No-tillage (NT ) , crop rotation is an essential requirement . However , there are still questions about the economic viability of the system , especially in irrigated agricultural areas . The objective of this study was to determine the effect of crop rotations and soil management on grain yield of maize and common bean and economic efficiency of the system . The experimental design was a randomized block design in split plots with six replications . Treatments included three systems of land management (plots ) : P1 = tillage in summer followed annually from a preparation with plow in winter ; P2 = tillage followed biennially preparation with a plow in the winter ; P3 = continuous tillage ; include it was also three crop rotations ( subplots ) : R1 = corn / beans / corn / beans , R2 = millet / beans / corn / beans , R3 = Soybean / beans / corn / beans . At the end of the rotation, the same were repeated rotations in the same area , thus having two cycles of rotation . The tillage gave the lowest grain yield for crops of maize and common bean . Pearl millet provides the highest grain yield of common bean in the SPD . All rotations tested provide positive economic returns , ie , are economically viable . Among the tested , crop rotation millet / dry bean / maize / common bean , the SPD , is the one that provides the greatest economic return .