| Aiming at the problem that it is difficult to grow crops in Soda Saline-Alkali soil,the improvement effects of five treatments,zeolite(Z),acid zeolite(ZH),aluminium sulfate(AL),aluminium sulfate+zeolite(AL+Z),aluminium sulfate + zeolite(AL+ZH),on Soda Saline-Alkali Soil were studied in this experiment,which provided theoretical basis and technical support for the improvement and utilization of Soda Saline-Alkali soil.1.Sedimentation test results show that simple aluminium ion improvers and acidic substances such as citric acid and phosphogypsum have the best effect on reducing soil pH.The metal cations in soil equilibrium solution treated with aluminium ion improvers increase significantly,and pure zeolite improvers can significantly reduce the cations content in soil equilibrium solution;the treatment of soil equilibrium solution containing aluminium ion improvers has the best effect on reducing soil pH.The SAR of liquid solution increased significantly,while the SAR of pure zeolite amendments in soil equilibrium solution decreased significantly.2.Compared with CK treatment,all treatments can significantly reduce soil bulk density in dryland and paddy fields,among which AL treatment effect is the most significant;all treatments can improve soil structure in dry and paddy fields,and application of different amendments and combinations in dry soil The proportion of small particle size microaggregates <0.001 mm and 0.001-0.005 mm decreased by 28.46%-55.46%,which reduced the proportion of small particle size microaggregates of <0.001 mm and 0.001-0.005 mm in paddy soil by 34.21%-55.00%;the proportion of large particle size microaggregates in dry soil increased by 19.05%-52.78%,and the proportion of large particle size microaggregates in paddy soil increased by 37.61%-69.21%;thus increasing soil permeability and improving The poor physical properties of saline-alkali soil.From the influence of different improvers and combinations on the physical properties of saline-alkaline soil,AL treatment is the best treatment,but the improvement effect of AL+ZH treatment is not much different from AL treatment.3.Compared with CK,all treatments can significantly reduce the content of exchangeable sodium in dry and paddy soils.Different amendments and combinations reduced soil exchangeable sodium content by 38.60%-61.30% in dry fields and 25.20%-71.50% in paddy soil.Regardless of the paddy field,AL+ZH treatment is the largest reduction treatment;all treatments can increase the soil cation exchange amount to some extent,but the effect is not significant;because the exchangeable sodium content decreases,the cation exchange capacity increases,all treatments The alkalization degree of the soil can be significantly reduced,the soil alkalization degree in the dry land is reduced by 14.24-22.23 percentage points,and the soil alkalization degree in the paddy field is reduced by 14.43-40.92 percentage points.From the influence of different modifiers and combinations on the chemical properties of saline-alkaline soil,AL+ZH treatment is the best treatment.4.Compared with CK,all treatments can increase the organic matter content of dryland and paddy soils;soil organic matter content increased by 0.94%-3.84% in the first year and 2.00%-11.30% in the second year;soil under paddy conditions The content of organic matter increased by 2.00%-11.22% in the first year and increased by 5.00%-23.04% in the second year.The treatment with AL could significantly increase the content of soil organic matter.Zeolite treatment had a certain increase in soil organic matter content but the effect was not significant.From the influence of different improvers and combinations on the content of soil organic matter,the treatment with AL is a good treatment.5.Compared with CK,all treatments have a significant positive effect on the yield components of maize and rice,among which AL+ZH has the best improvement effect;all treatments can significantly increase the yield of maize and rice,and the first yield of maize The annual increase is 18.62%-56.38%,the second year is increased by 29.59%-65.33%,the AL treatment yield is the highest;the rice output is increased by 41.20%-226.80% in the first year,and the second year is increased by 64.90%-296.90%,AL+ZH treatment output highest.From the influence of different improvers and combinations on crop yield,AL+ZH treatment is the best treatment.In summary,AL+ZH is the best improvement agent. |
PDF Full Text Request