- Sep 22, 2017 -
The essential nutrients for higher plants include carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium, sulphur, iron, boron, manganese, copper, zinc, molybdenum and chlorine, 16 elements. These 16 kinds of essential nutrient elements can be divided into large amount, medium quantity and micronutrients because of their different content in crop body. A large number of nutrients in the crop in the body about the weight of the thousand points to scores, such as carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, and so on, the medium and micro-nutrients in the crop in the body of the weight of the thousand to 100,000 per cent, such as calcium, magnesium, sulphur, iron, boron, manganese, copper, zinc, molybdenum and chlorine.
The lack of any one element will affect the normal growth and development of the crop, for example, the lack of nitrogen can lead to short and thin plants, leaves are yellowish green, yellow orange and other abnormal green, serious nitrogen deficiency, crop significantly premature senescence and early ripening, yield significantly reduced, only by increasing the application of nitrogen fertilizer, can reduce its harm.
Second, nitrogen, phosphorus and potassium dominate the fertilizer market in China, the new fertilizer arises
China's fertilizer industry since 1949 began to develop rapidly, the development sequence is the first nitrogen, post phosphate, potassium, composite (mixed) fertilizer, the development trend of conventional fertilizer is basically following the world's main trend of fertilizer industry development, that is, to the high concentration and compound direction. At present, the pattern of fertilizer in China is the basic self-sufficiency of nitrogen fertilizer, the small amount of phosphate fertilizer imports, the majority of potash need to import.
Chemical fertilizer has always been an important factor for crop yield, and the contribution rate of grain production in China is as high as 40%. However, the unreasonable application of fertilizer for a long time brings a series of problems to the quality of cultivated land, the actual utilization rate of the fertilizer is less than 30%, the soil pollution problem is serious, the pollution accident is frequent, and more than 10% of the national cultivated land area has been polluted by heavy metals, of which about half of Mercury and other toxic heavy metals and oil-like organic pollutants. With the emergence of these problems, new fertilizers have emerged.
The new type of fertilizer refers to a certain amount of fertilizer function and a certain increase in production, from the fertilizer production enterprises to develop and produce, in line with industry or enterprise standards, containing machine, inorganic, microbial agent or both of the above components, by physical, chemical, biological methods processing of new varieties of fertilizer. The new type of fertilizer can effectively improve the traditional fertilizer utilization rate low, excessive application and so on a series of problems, the correct application can improve the utilization rate of fertilizer, to increase efficiency and reduce the amount of pollution, is the development of efficient, green, sustainable agriculture inevitable requirements.