| Planting paddy is one of the effective ways on saline sodic soil improvement and utilization. Also,it is the best way to improve agriculture benefit and increase income of peasants.Howere,it is need some time to form high stable yield farmland.The paper studied the saline sodic soil physical and chemical properties, water and salt movement inorder to enrich the theoretical and practical requirement on technical requirement of development and utilization in saline sodic soil. There results showed that: 1.The effect of improvement measures on the distribution of organic matter and available nutritionsThe improved saline sodic soil of paddy field has higher content of the organic mater and available nutrients in 0-5cm,5-18 cm.Hoever the content significantly decreased under 18 cm. T3 and T4 treatmenthave no change on Allali-hydrolyzable N contents and orgaqnic matter in autumn;the Available K contents higher than T4 treament and the content of Available P contents significantly lower than T4 treament. Totally, The improve amendation of 3-year-old organic fertilizer add Al2(SO4)3 amendment to achieve a rapid amendment objective and improve the fertility of soil.After a growth period,the orgaqnic matter, Available K contents and Allali-hydrolyzable N contents all improved compared to spring data,but Available P contents was significantly decreasd. The newly reclaimed saline paddy field shows a serious shortage of fertilizer, phosphate fertilizershould be increased investment,maintain the balance of phosphorus in the soil. 2. The effect of improvement measures on the content of total salinity and exchange salinityImprovement measures effect the content of total salinity and exchange salinity.The total salt content and exchange salinity content has decrease tendency slightly in autumn than the soil in spring. The both datas of two seasons show “>”style, the total desalting effect were T3 >T2 >T4> T1>CK. We see from the exchange salinity, the ordinary of improving soil alkalinewere T3 >T2 >T4> T1>CK. Totally, 3-year-old organic fertilizer add Al2(SO4)3 amendment is the better treatment. 3. The effect of improvement measures on physical properties.The amended saline sodic soil has significantly improved on physical properties. soil structure was toward good, soil mechanical composition is given priority to with soil silt. Along with the remediation, the soil bulk density decreased.Compared three datas,that they close the optimal proportion.It is 2:1:1. From the structure coefficient and dispersion, we see T3 >T2 >T4> T1>CK.Applacation of 3-year-old organic fertilizer add Al2(SO4)3 amendment have significantly improvement of saline sodic soil. 4. The effect of improvement measures on water and salt movement.Improvement measures all can decreased content of total salinity,Salt content mainly content of K-、Na+、CO32-、HCO3-in top layer.During the paddy growing season,the highest content showed due to the water pressure in 18-30 cm.It is indicates that the water have effect of inhibition salt. After paddy field drying(130d),the content of content of K-、Na+、CO32-、HCO3- decreasd,the content of Ca2+、Mg2+、Cl-、SO42-improved.After salne sodic soil improved,the “desalinated surface”was established. It inhibit the salt movement to the top. 5. The evaluation under soil improvement measures of all datas of applying to the subordinate function analysis.Applying to the subordinate function analysis of different Improvement measures, the comprehensive evaluation of soil improvement effect of different treatments, it is concluded that 3-year-old organic fertilizer add Al2(SO4)3 amendment> 6-year-old organic fertilizer amendment>3-year-old organic fertilizer amendment>3-year-old Al2(SO4)3 amendment >CK, 3-year-old organic fertilizer add Al2(SO4)3 amendment as the best model of afforestation to achieve a rapid amendment objective. |
PDF Full Text Request