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A simulation test of the impact on soil moisture by agricultural machinery

机译：农业机械对土壤水分影响的模拟试验

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摘要

To study the impact by agricultural machinery on changes in soil moisture, we used a simulated test method employing round iron plate based on the ground pressure ratio between the front and rear wheels of wheeled tractors and crawler tractors. We conducted soil compactions with five pressure loads (35, 98, 118, 196 and 345 kg), and measured soil moistures at different depths and under different compaction times, as well as compared those before the loads was applied. The results indicate that soil moisture was generally lost after compaction by agricultural machinery and its loss was related to pressure load, soil depth and compaction times. Generally, moisture loss increased with the increase of pressure load and mostly occurred at the soil surface (0 to 5 cm) for light loads (110 kg). Moreover, the moisture loss decreased gradually with the increases in soil depth for light loads (37 and 98 kg), although it was first increased and then quickly decreased for heavy loads (>= 118 kg). The loss of soil moisture by 5 compactions was in similar pattern with 1 compaction, but was much larger with the gap by 0.5 to 1.5% between them.
机译：为了研究农业机械对土壤水分变化的影响，我们使用了基于轮式拖拉机前轮和履带拖拉机的前轮和后轮的地压比采用圆形铁板的模拟试验方法。我们用五个压力负荷（35,98,118,196和345千克）进行土壤相容，并在不同的压实时间下测量土壤水分，以及在施加载荷之前比较。结果表明，农业机械压实后土壤水分普遍丧失，其损失与压力负荷，土壤深度和压实时间有关。通常，随着压力负荷的增加，水分损失增加，并且大多发生在土壤表面（0至5cm）的光负荷（110kg）。此外，水分损失逐渐随着光负荷（37和98kg）的土壤深度的增加而降低，但首先增加，然后迅速降低重载（> = 118千克）。通过5个作用的土壤水分损失在相似的图案中具有1个压实，但在它们之间的间隙比差距更大。

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