TY - JOUR T1 - The Simple and Combined Effects of Organic and Mineral Amendments on Aggregates Size of the Salic Sodic Soil with Silt Loam Texture TT - بررسی آثار جداگانه و توأم مواد آلی و معدنی بر اندازه خاکدانه‌ها در یک خاک شور و سدیمی با بافت سیلت لوم JF - JSTNAR JO - JSTNAR VL - 15 IS - 56 UR - http://jstnar.iut.ac.ir/article-1-1716-en.html Y1 - 2011 SP - 169 EP - 178 KW - Wheat straw Farm yard manure KW - Gypsum KW - Cement KW - Aggregates N2 - Soil structure and aggregate stability affect soil erodibility. There is a necessity for increasing aggregate stability against erosive factors such as wind and water. This study was conducted on surface soil samples (0-20cm) collected from agricultural land susceptible to erosion located in Chahoo, southeast of Fars province. The experimental design was CRD with 10 treatments and was replicated 3 times as follows: control plot (without addition of soil amendments), pure gypsum, chopped wheat straw, farm yard manure, gypsum+wheat straw, gypsum+ farm yard manure (1% w/w), cement at levels (0.3% w/w), (0.6% w/w), (0.9% w/w), gypsum +cement (0.9% w/w). After one, four and seven months, the amounts of soil aggregates in 53-4000 µm sizes were determined by wet sieving and MWD was calculated. The results of aggregate size distribution in every stage of the experiment showed that application of farm yard manure and wheat straw separately or in combination with gypsum through reduction in aggregates with diameters of 106 µm. Based on the results of this research, the effect of these treatments, which increased MWD of the aggregate, results from the amount of aggregates with diameters larger than 1000 µm. According to the results of this study, it is suggested that these treatments be considered suitable to increase the stability of sensitive silt loam soils. M3 ER -