掺沙和有机物料对南疆板结黏土特性及棉花生长的影响OA

In order to explore the improvement effect of different organic materials and sand admixture on cemented clay soil,a field experiment was set up in Kuqi,Xinjiang,and a split-plot experiment was used to set up sand mixing(S)and non-sand mixing treatments.On this basis,5 organic material treatments were set up,including farmyard manure(N),biochar(T),biological fungus fertilizer(J),commercial organic fertilizer(P)and mineral potassium fulvate(H).For each group,there were 3 gradient treatments of 50%(1),100%(2)and 150%(3),with no sand addition and no application of organic materials as control(CK),the effects of sand mixing treatment and 5 kinds of organic materials on the physical and chemical properties of clay soil and agrologic characters of cotton at harvest time were investigated.The results showed that the 5 kinds of organic materials improved soil bulk density,porosity and mechanical composition,and the improvement effect of the single application of organic materials and the combined application of fertilizer and sand in N and T treatments were most significant.Single application of 5 kinds of organic materials and combined application of fertilizer and sand increased the contents of soil organic matter,total nitrogen,alkaline hydrolyzed nitrogen,available phosphorus and available potassium in different degrees.Compared with CK,the soil salt content of each group in the organic materials and sand treatment was reduced,and HS3 treatment had the best improvement effect on pH and total salt content.The contents of organic matter and alkaline hydrolyzed nitrogen in JS3 treatment increased the most,and the contents reached 18.67 g·kg-1 and 45.12 mg·kg-1,respectively.The contents of available phosphorus and available potassium in NS3 treatment increased the most,which reached 24.23 and 441.33 mg·kg-1,respectively.After the application of organic materials,the plant height,stem diameter,dry and fresh weight and yield of each treatment were significantly improved,and the agrological characters and yield of cotton under the fertilizer and sand combined application were improved.Among them,the best treatment was the combination of sand and farmyard manure.In conclusion,by adding organic matter and river sand to clay,soil physical and chemical properties could be improved and cotton stress resistance could be improved.Above results provided a new research reference for improving crop yield on cemented clay soil.