Study On The Effect Of Different Modifiers On The Improvement Of Yellow Soil In Qianxi Area

Due to its soil characteristics and irrational agricultural management measures,the problem of compaction of yellow soil in Guizhou is more serious,and seriously affects the crop growth and economic development.In recent years,some progress has been made in the improvement of compaction soils,but there are few studies on the effect of different modifiers on the improvement of crushed yellow soils.In this paper,we selected the yellow soils in the western Guizhou province of Bijie City,Guizhou Province as the research object.By adding the different amount of potassium fulvic acid,foam sand and bamboo charcoal and other soil improver by the combination of greenhouse experiment and field experiment.The results of the study on the improvement effect of different modifiers and their adding amount on the yellowing of yellowing in Guizhou were as follows:1.In the greenhouse test,the modifiers reduced the soil bulk density to varying degrees.Among them,the incorporation of foam sand on the improvement of soil physical properties of the most prominent.The soil bulk density of 0.23 kg foam sand,0.45 kg foam sand and 0.68 kg foam sand treated decreased by 1.85%,5.7% and 6.6%,respectively.In the soil ventilation pores and water holding pores,the improvement of foam sand is better,and foam sand itself,the inorganic porous characteristics.In the field experiment,the addition of organic fertilizer and foam sand had better effect on soil porosity and water holding pore.2.In the improvement of soil chemical properties,the effect of potassium fulvate on the improvement of soil alkali-hydrolyzable nitrogen was the most prominent,and the content of alkali-hydrolysable N in the soil treated with 14 g of potassium citrate and 21 g of potassium citrate was an increase of 10% and 17%;bamboo charcoal on soil available phosphorus and soil available potassium content of the best results.3.In the greenhouse test,the addition of fulvic acid to the increase in the biomass of vegetables has a prominent improvement effect.In the improvement of nutrient elements in vegetables,adding foam sand to improve the effect of the most stable.In the field test,the foam sand can effectively improve the yield of tobacco leaves,in terms of tobacco quality,foam sand and organic fertilizer have a better improvement effect.4.Soil modified agent potassium citrate has better improvement effect on total arsenic and total cadmium content in soil,reducing 6.4% of total arsenic content in soil and 5.3% of total mercury content.Mixed with 14 g potassium fulvate treatmentimproved the most prominent effect.Bamboo charcoal had better improvement effect on soil total mercury and available cadmium,reduced the soil total mercury content by20.5% and 9.8% of available cadmium.The effect of foam sand on the reduction of cadmium and soil total mercury content in soils was poor,but the effect of reducing lead in soil was very obvious.