How to improve saline soil?

I. Rapid improvement of saline soil

"Horticultural saline soil improvement fertilizer" (hereinafter referred to as improved fertilizer) formula design with reference to domestic and international information, using "sodium ion adsorbent", soil acidifier, chemical improver, humic acid, rooting agent, etc. It is made of 10 kinds of raw materials. And contains nitrogen, phosphorus, potassium and a variety of trace elements, organic improvers and inorganic improvers combined, fast-acting and late combination, the best ratio of NPK content, the use of acid-base reaction principle, the principle of ion exchange, the principle of salt transformation, so that the physical and chemical shape of saline soil to improve, reduce the PH value and salt content, improve soil fertility, that is, for the base fertilizer can be fertilizer and can be used as a fertilizer, set of alkali and fertilizer all in one.

"Sodium ion adsorbent" has a strong exchange capacity, the saline soil Na +, SO4-2, Cl- and other adsorption capacity, the soil can be applied to improve the fertilizer to reduce the PH value and alkalinity, adsorption of ammonium ions and potassium ions and improve the exchange of soil ions, so as to achieve the purpose of soil reclamation, desalination, soils to the direction of plant growth, so that the soil to the direction of plant growth. The soil will develop in the direction favorable to plant growth, and it is effective for plants grown in saline and alkaline conditions for 1-2 years. In addition, due to the "sodium ion adsorbent" exchange performance is good, can be used to improve the cation exchange capacity, adjust the PH, exchange to capture the harmful metal ions in the soil, reduce soil salinity, the effect is very obvious, desalination rate of up to 18.6-29.3%.

At present, the improved fertilizer since 1997 in the country since the promotion, has affirmed the effect of 8 special formulas: Dezhou formula, Tianjin formula, Yinchuan formula, Panjin formula, Lanzhou formula, Yancheng formula, Liaocheng formula, Dongying formula. 2003 constantly adjust the formula, the introduction of the third generation of formulas, especially acidity have different degrees of increase, PH value of 5.5-6.0. Improved Fertilizer can be used for trees, green space, lawn cultivation (ground spreading).

In recent years, the Bohai Sea area centered on Tianjin has become a hot spot for national economic development, and how to effectively green the coastal saline belt has been a problem. Tianjin Liu Yuan nursery contracted by the Tianjin Municipal Development Zone water purification plant greening project, soil salt 0.40%, soil PH value of 8.5, is a coastal saline and alkaline land. The application of improved fertilizer (Tianjin formula) 40 tons, according to 1kg/m2 application, sowing rye and tall fescue mixed lawn 40,000 square meters, once into the lawn, lawn green period extended 18-20 days. The project in 1996 in tianjin development zone greening project evaluation won the second place.

Tianjin Development Area Green Source Landscape Engineering Co., Ltd. in the construction specification for many years with improved fertilizer treatment of saline and alkaline, has completed the CuiXiang village community greening and other projects, the survival rate of trees reached more than 95%.

Yinchuan Association of Science and Technology Yan Xiuhua in PH8.0 saline and alkaline land planting Xinjiang poplar, per plant application of improved fertilizer (Yinchuan formula) 1kg, survival rate than the control increased by 8.7%; per acre of improved fertilizer application 100kg, the diameter of the ground diameter of the rough growth than the control increased by 0.49cm, planting of ash per plant application of 1kg, its growth height and diameter increased by 0.44cm and 0.27cm, respectively, compared with the control.

Texas Huaneng Power Plant is located in Northwest Shandong to chloride, sulfate-based moderate saline area, the plant green space in 36 cedar due to saline and alkali hazards withered, yellowing dying, each plant only 2kg improved fertilizer (Texas formula) sprinkled on the surface of the loosening and watering, rapid improvement of saline and alkaline soils, 34 plants see the shadow of the "back from the dead! "Back from the dead". And magically drew out the tender green shoots.

In recent years, the practice shows that improved fertilizer management of saline soil below the medium degree (salt content of 0.4% or less) compared with other methods of alkali change has the advantage of rapid management. Especially when trees, flowers, lawns due to the tight schedule, it is too late to apply other measures to change the alkali, with improved fertilizer is simple and easy to do. As long as the improved fertilizer sprinkled on the surface of the soil loosening, watering, soil PH value can be rapidly reduced, but the decline in salt content to last a few months to see the effect. Generally an application, 1-2 years effective. Diameter 5cm trees 0.5-1kg per plant, especially for the heavier alkali spots in the green space can be "a small number of" intervals of several days "many times" application, in order to be effective.