Effect of Soil Compaction on Seed Germination of Some Seedlings to Determine Some Design Parameters of Planting Machines

 The soil compaction is one of the main reasons of destructing the soil which caused in changing the soil structure, limitation of air and water penetration and lower level of penetration of the root in the soil. The purpose of this study is to determine the suitable soil compaction for melon, watermelon and cucumber. The independent factor including the cultivation type in two levels of Confined Compression Test (CCT), Plate Sinkage Test and Uniaxial confined compression Test (CCT + PST) for three mentioned agricultural was considered. There were two moisture content levels of 15% and 17.5% and four levels of density including 1.3, 1.4, 1.5 and 1.6 (gr/ cm–3) used for these products. Some parameters such as germination timing (day), stem length (mm), root length (mm) and seedling weight with the regular root in the soil (gram) were measured and investigated. The results revealed that the root lengths at the cultivation type of (CCT) in every three products were more than the root length of the cultivation type of (PST + CCT). Also there were better results for cultivation type of (PST + CCT) for some variables such as stem length and germination day for all studied products by his special cultivation type.