Energetic balance for crop rotation systems to wheat under no-tillage

Abstract

From 1990 to 1992, at the Cooperativa Agrária Mista Entre Rios Ltda., in Guarapuava, PR, Brazil, the effect of some crop rotation systems of wheat on energetic balance was estimated. Four rotation systems for wheat were studied: 1) monoculture; 2) rotation of one winter without wheat: 3) rotation of two winters without wheat; 4) rotation of three winters without wheat. The winter crops (oat, barley, common vetch, and wheat) and summer crops (corn and soybean) were seeded under no-tillage. A randomized complete block design, with four replications and plots with 60 m2, was used. In the 1990 growing season under monoculture wheat showed lower energetic balance than under rotation. Soybean presented energetic efficiency and stabilized cultural productivity of several winter crop rotation systems.