تاثير تراكم خاك هاي زراعي بر نفوذ پذيري و كارايي مصرف آب در منطقه پاكدشت

Effects of compaction in the cultivated soils on permeability and water use efficiency in Pakdasht region

Soil compaction is a major concern of farmers in Pakdasht region. Extreme soil compaction causes increase in soil penetration resistance and bulk density,also it degrades soil physica properties and reduced permeability. Moreover, water and nutrient absorption have been reduced to minimum which result to a decrease in distribution of roots, plant growth and reduction yield. The aim of this research was to study the effects of compaction in the cultivated soils at 12 farms at 10 to 35 cm of wheat cultivation; each of farms was as a treatment. The experiment has been conducted on based of randomized complete blocks design. In this research compaction is measured by digital Penetrologger in 10 different points of each farm .The results have showed that bulk density, soil penetration resistance and permeability have been changed from 1.34 to 1.79 Mg.m"3, 0.32 to 4.54 MPa and 70 to 12 mm.h"1 in comparison between non compacted and severely compacted soils, respectively. Extreme soil compaction causes, permeability has been reduced to 81.4%,this causes a 34 % decrease in available water which subsequently resluted in 40% yield reduction. Therefore water use efficiency decreased by 39.3%. Reduction of soil compaction could lead to soil quality improvement, in increase water use efficiency, and yield.