Improvement Of Coastal Saline-Alkali Soil By Wood Vinegar Liquid,FlyAsh And Garden Waste Compost

The soil salinization in coastal areas of China is serious and widely distributed,which restricts the development of agriculture and forestry.In this study,by using the methods of leaching desalination test and indoor culture test,wood vinegar,fly ash and garden waste compost were used as improved materials to explore the application of these three species in the surface soil of idle farmland in Zhongjie Farm,Huanghua City,Hebei Province After improving the material,the effect on the leaching of salt segregants and the physical and chemical indexes of the soil was evaluated,and the improvement effect on the coastal saline-alkali soil was evaluated.conclusion as below.?1?After applying these three kinds of improved materials,it can promote the leaching of salt in the soil,and the effect of applying fly ash is the best.The application of fly ash can quickly reduce the ion content in the soil in a short time,significantly shorten the salt leaching time,the total leaching time is shortened by 25%,the effect of applying wood vinegar is second,and the application of garden waste composting After the soil conductivity and the content of each ion are higher.Comparing the leaching process of wood vinegar,fly ash,and garden waste compost on the leaching of coastal saline-alkali soil,it has no effect on the order of elution of salt separators.?2?In the soil cultivation experiment,the application of wood vinegar,fly ash and garden waste compost can increase the nutrient content of the coastal saline-alkali soil.The most obvious effect on the contents of organic matter,alkali-decomposed nitrogen,available phosphorus,and available potassium in the soil is composting of garden waste,which is the highest when the application amount is 100 g·kg^-1,respectively 44.02 g·kg^-1,59.50 mg·kg^-1,308.24 mg·kg^-1,586.45 mg·kg^-1.Wood vinegar and fly ash did not significantly increase the content of alkali-decomposed nitrogen and available potassium in the soil,but it was better than wood vinegar in changing the effective phosphorus content in the soil.?3?The p H of each treatment of wood vinegar,fly ash,and garden waste composting was lower than that of the control group,and the mixed application of the three had the best effect.When wood vinegar and fly ash are mixed and the maximum amount of fly ash is applied,the soil EC value is the lowest,which is 2.62 m S·cm^-1.When the three are mixed and the application rate is high,the SAR value of the soil is the lowest at 2.83,and the exchangeable Na⁺content in the soil is the highest at 12.13 cmol·kg^-1.After the cultivation,it was found that with the increase of the application amount of fly ash and garden waste compost,the main Na⁺and Cl^-content in the soil decreased significantly.?4?The application of wood vinegar has no significant effect on the bulk density and total porosity of the coastal saline-alkali soil,but the application of fly ash and garden waste composting is significantly reduced.When the amount of application is maximum,the bulk density is reduced by 16.78%compared with the control group.Degree increased by 88%.WR₂and WR_0.25 gradually increase with the application amount of improved materials,of which the highest application amount of fly ash and garden waste compost is the highest,2.77 and 20.88 respectively.The improvement effect of fly ash and garden waste compost on soil saturated hydraulic conductivity is significantly better than that of wood vinegar,and the effect is the best when the maximum amount of fly ash is applied,which is 3.86×10^-4 cm·s^-1,Compared with the control group,it has increased by 8 times.Comprehensive analysis considers that the application of appropriate amount of wood vinegar,fly ash and garden waste compost has a better effect on improving the physical and chemical properties of coastal saline-alkali soil.Considering the application amount of the improved materials,the improvement effect is the best when the application rate of wood vinegar dilution is 600 times,the fly ash application is 9%volume fraction,and the garden waste compost is 60 g·kg^-1.