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<p>in unison, or separately allowing the operator to plough the center of rows as well as between and around <a href="page.php?w=orchard">orchard</a> trees.</p>

<p><big>Types</big></p>
<p><big>Primary and secondary tillage </big></p>
<p>Primary tillage is usually conducted after the last harvest, when the soil is wet enough to allow plowing but also allows good traction. Some soil types can be plowed dry. The objective of primary tillage is to attain a reasonable depth of soft soil, incorporate crop residues, kill weeds, and to aerate the soil. Secondary tillage</p><p>
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