Saline-alkali soil is a general term for saline soil and alkaline earth. Saline soil is salinized soil with high salinity (chloride or sulfate). The soil alkalinity (in terms of pH) is not necessarily high; and the alkaline earth is a soil with carbonate or bicarbonate, and the pH is high. The soil is alkaline. The common characteristics of saline-alkaline soils are low organic matter content, poor physicochemical properties of soil, and many negative and positive cations harmful to crop growth. Soil fertility is low, and crops are difficult to catch.
The general principle of fertilization in saline-alkali soil is to increase the use of organic fertilizers and to appropriately control the use of chemical fertilizers. Organic fertilizer contains a large amount of organic matter, which can increase the buffer capacity of the soil against harmful cations and cations, and is conducive to rooting and keeping seedlings. In places where conditions permit, a large number of methods can be used to return straw, plant salt-tolerant green manure and other methods to reduce the harm of salt and alkali to crops.
Fertilizer application should not be too much to avoid aggravating soil secondary salinization. Fertilizers should be mainly applied in small fractions, combined with organic fertilisers. When applying chemical fertilizers, attention should be paid to irrigation, which can reduce the concentration of soil solution. Phosphate fertilizers should be added to saline-alkali land, and nitrogen fertilizer should be applied in an appropriate amount, with little or no application of potassium fertilizer, because the potassium in saline-alkali soil is generally not lacking. Alkaline soil fertilization should be applied more physiological acidic fertilizers, especially the application of superphosphate, ammonium sulfate and other sulfate-containing fertilizers, to improve the alkaline earth. Salt Fertilizer Fertilizer application of physiological neutral fertilizer as much as possible, does not leave the useless on the crop of yin and cations. Since saline-alkali soil is generally not easy to grow seedlings, it is necessary to be careful when applying seed fertilizers and try not to approach the seeds so as not to increase the concentration of soil solution and affect germination. Top dressing should be applied in time according to the situation of fertilizer shortage. Pay attention to basal fertilizers, especially farmyard fertilizers that contain many organic substances, and use them as a large amount of basal fertilizer, which is beneficial to soil improvement and crop yield increase.
The general principle of fertilization in saline-alkali soil is to increase the use of organic fertilizers and to appropriately control the use of chemical fertilizers. Organic fertilizer contains a large amount of organic matter, which can increase the buffer capacity of the soil against harmful cations and cations, and is conducive to rooting and keeping seedlings. In places where conditions permit, a large number of methods can be used to return straw, plant salt-tolerant green manure and other methods to reduce the harm of salt and alkali to crops.
Fertilizer application should not be too much to avoid aggravating soil secondary salinization. Fertilizers should be mainly applied in small fractions, combined with organic fertilisers. When applying chemical fertilizers, attention should be paid to irrigation, which can reduce the concentration of soil solution. Phosphate fertilizers should be added to saline-alkali land, and nitrogen fertilizer should be applied in an appropriate amount, with little or no application of potassium fertilizer, because the potassium in saline-alkali soil is generally not lacking. Alkaline soil fertilization should be applied more physiological acidic fertilizers, especially the application of superphosphate, ammonium sulfate and other sulfate-containing fertilizers, to improve the alkaline earth. Salt Fertilizer Fertilizer application of physiological neutral fertilizer as much as possible, does not leave the useless on the crop of yin and cations. Since saline-alkali soil is generally not easy to grow seedlings, it is necessary to be careful when applying seed fertilizers and try not to approach the seeds so as not to increase the concentration of soil solution and affect germination. Top dressing should be applied in time according to the situation of fertilizer shortage. Pay attention to basal fertilizers, especially farmyard fertilizers that contain many organic substances, and use them as a large amount of basal fertilizer, which is beneficial to soil improvement and crop yield increase.
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In 2008, BCHT successfully launched its product Varicella Vaccine, Live in China. In the following years, BCHT continuously committed to improving the product and led in 2010 removal of gelatin from adjuvant and extended the vaccine shelf-life up to 36 months which is the longest one in the world in 2011. And it has the following qualities.
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