TRACTIVE DEMAND, SOIL MOBILIZATION PARAMETERS, AND CORN YIELD IN COMPACTED OXISOL

ABSTRACT Direct seeding systems are characterized by soil disturbance only occurring in the sowing line and the maintenance of the remaining area is achieved by covering with crop residues. Without total area soil mobilization as recommended by the no-tillage system, associated with the increase in the degree of soil compaction caused by the traffic of agricultural machinery, there can be a decrease in crop productivity. This study aimed to evaluate machine parameters, soil mobilization, and corn yield as a function of different furrow opener working depths (0.065, 0.095, 0.125, and 0.150 m) and evaluate the direct seeding of winter ground cover plants (black oat or forage turnip) in compacted Oxisol. The experiment was arranged in strips, in a randomized block design, with eight treatments and four replications. The deepening of the furrow opener shank increased the strength and power required at the drawbar in the seeding operation, as well as increased the soil mobilization in the seeding line. However, it did not prove to be an efficient management practice to increase corn productivity.

摘要 直播系统的核心特征为仅在播种带内实施土壤扰动，其余区域通过覆盖作物残体维持原生地表状态。若未遵循免耕系统所推荐的全面积土壤耕作规范，加之农业机械通行引发的土壤压实度上升，作物生产力或出现下降。本研究旨在探究不同开沟器作业深度（0.065、0.095、0.125及0.150米）下的农机作业参数、土壤扰动程度与玉米产量的变化规律，并评估在压实氧化土（Oxisol）上直播冬季地面覆盖作物（黑燕麦或饲用芜菁）的可行性与效果。本试验采用条区-随机区组设计，设置8个处理组，4次重复。开沟器铲柄作业深度增加，会提升播种作业时牵引杆所需的牵引力与输出功率，同时增大播种带内的土壤扰动范围与程度。但该措施并未被证实为提升玉米产量的高效田间管理手段。