the effect of tillage systems on soil nutrients case study: agricultural land, city of kalaleh - golestan province

the challenge for today's researchers and practitioners agriculture, increase productivity while maintaining or improving environmental quality (including water, soil and air) to be ¬ rapid population growth and increasing demand for food, researchers are continuing to study the management of high yielding varieties suitable for growing to escape environmental stresses in dry conditions and provide appropriate solutions and technical manuals, planting vbrdasht will be required to increase crop production. the purpose of soil conservation tillage is reducing soil tillage operations and crop residue management on soil.to different tillage methods on soil for nitrogen, phosphorus and potassium in soil. this study was conducted with three tillage treatments including: conventional, reduced and no tillage and three replications in a completely randomized design (crd) in some agricultural fields with silt loam texture.. results of the study have shown that conventional tillage caused highest n and k contents in comparison with other tillage treatments; while highest p content was observed by implementation of no-till and reduced tillage systems, respectively.