Abstract
A field experiment was conducted in one of the fields in Nineveh Governorate, in soil texture was clay silty loam, under the axial sprinkler system, where the research included studying the effect of (two levels of soil moisture (13-15%), (17-19%), two depth of tillage (12-14 cm) and (15-17 cm), and three types of chisel plow-share (conventional share, the spearhead and the severed share)), on the following field indicators (draft force, soil adhesion force, the tillage appearance through (number of clods with a diameter larger than 7.5 cm) and the vertical deviation ratio to tillage depth). This experiment was implemented with split-split plot under randomized complete block design (RCBD) with three replicates. The results showed that the lowest draft force, adhesion strength, number of clods, and the lowest vertical deviation ratio to tillage depth were recorded in the soil moisture content (13-15%), the depth (12-14) cm recorded the lowest draft force, adhesion strength and a number of clods, while it outperformed depth (15-17) cm in obtaining the lowest ratio of vertical deviation, as the severed share outperformed in obtaining the lowest draft force, adhesion strength and a number of clods, while the spearhead share outperformed in obtaining the lowest ratio of vertical deviation, achieved interaction between the soil moisture content (13-15%) and the depth (12-14) cm, the lowest draft force, adhesion strength and a number of clods, while the interaction between the soil moisture content (13-15%) and depth (15-17) cm achieved the lowest ratio of vertical deviation.
Highlights
The chisel plow is one of the most prevalent plows
Abdullah and Shaheen (2018) indicated that the increase in the depth of tillage led to a decrease in the vertical deviation ratio, so that the pressure from the plow on the soil will be greater. the degree of soil adhesion depends on its moisture, fragmentation, and the nature of the surface of the working part. when making special agricultural equipment in dealing with the soil, several measures are put into the calculation aimed at reducing adhesion because this characteristic may harm the quality of the tillage and increase the qualitative resistance to pulling (AlBanna, 1990)
1- Draft force: Table (3) shows the recording of soil moisture content (1315%) the lowest significant value of draft force was (6.67) kN compared to the soil moisture content (17-19%), the reason for this is due to increasing the soil moisture content of the soil increases the slippage and reduces the chance of the wheels driving the tractor with the soil surface, which in turn leads to an increase in the load on the rear axial of the tractor, which increases the draft force, and this is consistent with what mentioned (Manuwa and Ademosun, 2007; Jebur and Alsayyah, 2017)
Summary
The chisel plow is one of the most prevalent plows. It has many characteristics: including the lack of power requirements compared to the invert plow. shoving and dismantling the soil at various depths and does not overturn it with little coverage of plant remains. We show the outperformed of the soil moisture content interaction (13-15%) with depth (12-14) cm significant in obtaining the lowest value of the draft force, which reached (5.83) kN compared to the remnant of the treatments.
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