Effects Of Planting Rice And Salt Movement Characterists In Sodic Saline Soil Through Regulatory Measures

In our study, Sodic saline soils were taken as research objects in the Zhaoyuan County, Heilongjiang Province of China. According to serious soil salinization phenomenon, low land productivity, etc in the study area, we carried out different kinds of ameliorant utilization and organic fertilizer treatments. In our study, three groups of trials were performed, which were: ameliorant regulatory treatment (4treatments), oragnic fertilizer treatment (4treatments) and the researth of profile characteristics (6treatments). We discussed the four aspects of soil fertility characteristics, salt alkaline barrier characteristics and profile characteristics as well as yield of rice. The aim of the study was to achieve the reduction of soil salt alkaline barrier and the improvement of soil fertilizer and land productivity. At the same time, to determine the optimal dosage of and to screen the best organic fertilizer kinds applied to sodic salin soil and to provide a theoretical foundation for the sustainable and healthy development of saline soil area of agriculture of Heilongjiang Province.The results from the experiment indicated that:1. Soil fertility characteristics had been significantly improved, as follows:the soil available phosphorus, available potassium, organic matter and alkali-hydro nitrogen content were all highest in the treatment of applying special modifier500kg-hm"2in saline soil and applying special organic fertilizer in saline soil; the soil cation exchange capacity were all the largest in the treatment of applying special modifier750kg·hm-2in saline soil and applying special organic fertilizer in saline soil.2. Soil salt alkaline barrier characteristics had been significantly reduced, as follows:the soil electrical conductivity and pH value were all lowest in the treatment of applying special modifier500kg·hm-2in salin soil and applying special organic fertilizer in saline soil; the soil sodium ions content were lowest in the treatment of applying special modifier750kg-hm"2in saline soil, the soil carbonate ions content were lowest, soil calcium ions and magnesium ions content were highest in the treatment of applying special modifier500kg·-hm-2in saline soil, the soil sodium ions and carbonate ions content were lowest and the soil calcium and magnesium ions content were highest in the treatment of applying special organic fertilizer in saline soil; the exchangeable sodium percentage were lowest in the treatment of applying special modifier750kg·hm-2in saline soil and applying special organic fertilizer in saline soil.3. Changes in the characteristics of soil profile are as follows:from humus layer, alkaline layer to leaching layer, the alkali-hydro nitrogen, available phosphorus, soil organic matter and available potassium content were all decreased of each profile treatment; the sodium ions content of leaching layer and carbonate ions content of humus layer in the treatment of planting rice were highest, the sodium ions content of humus layer and carbonate ions content of alkaline layer in the treatment of not planting rice were highest; except for the treatment of not planting rice with having grass in the soil, other teratments were highest in the humus layor of calcium and magnesium ions content; the exchangeable sodium percentage were gradually increasing in the treatment of not applying modifier and applying local inorganic fertilizer and appilying special organic fertilizer, the exchangeable sodium percentage were gradually decreasing in the treatment of applying special modifier750kg·hm-2in saline soil, the exchangeable sodium percentage were least in the two treatments of not planting rice; the exchangeable sodium percentage were gradually decreasing in the treatment of not applying modifier and applying special modifier750kg·hm-2in saline soil and applying local inorganic fertilizer and special organic fertilizer in saline soil, the exchangeable sodium percentage in the alkaline layor were highest in the two treatments of not planting rice.4. The rice yield and economic benefit had been significantly enhanced, as follows:the economic benefit were largest in the treatment of applying special modifier500kg-hm"2in saline-alkali soil and applying special organic fertilizer in saline-alkali soil. The alkali-hydro nitrogen, available phosphorus, soil organic matter and available potassium and cation exchange capacity all showed significant positive correlation with rice yield.The results of the determination and evaluation of each index analysis suggest that:the improvement effect of sodic saline-alkali soil was the best when applying special modifier500kg·hm-2in saline soil; special organic fertilizer in saline-alkali soil was the best fertilizer of improving sodic saline.