Abstract
Factorial experiment carried out in 2024 in southern Baghdad, for the aim of evaluation the performance of heavy disc harrow offset with tractor engine 120 horse power under different moisture soil (14 % and 8 %), depth of pulverization (8 and15 cm) speed of tractor (4.7 and 8.2 km.h-1) in medium texture soil which was silty clay loam, after soil tilted at 20 cm by used moldboard plow width 1.05 cm as a primary tillage. Pulverization the soil under moisture 8 % gave higher (best) soil pulverization rate was 70.49 %, productivity 1.5824 ha.h-1, specific productivity 5273 m.h-1, least number of clods < 0.05 was 7.83 clods.m-2 and fuel consumption 12.40 L.ha-1. Depth pulverization 8 cm gave on the best pulverization soil rate 71.51 %, number of clods < 0.05 was 5.08 clods.m-2, productivity 1.5992 ha.h-1 and least fuel consumption 12.04 L.ha-1. Speed of the tractor8.2 km.h-1 gave better soil pulverization rate 70.57 %, productivity 2.0151 ha.h-1, specific productivity 6715 m.h-1, least number of clods< 0.05 was 7 clods.m-2 and fuel consumption 11.81 L.ha-1. All interaction among the treatments was significant difference. Correlation were direct and inverse, significantly and non-significant. Concluded the most effected factors in the study was tractor speed then depth of tillage and both of them more than influent from moisture of soil, pulverization soil at low moisture level 8 % and used higher speed tractor 8.2 km.h-1 and pulverize depth 8 cm gave a better results comparing with the rest of the factors in this field experiment.
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