With the rapid development of China’s chemical industry, the production and application of chemical fertilizers have been increasing. Increasing application of chemical fertilizers has undoubtedly played an important role in the development of agricultural production. However, with the increase of fertilizer application, the cost of fertilizer application increases and the utilization rate of fertilizer decreases. Currently, utilization rate of nitrogen fertilizer in China is 30-50%. The utilization rate of phosphate fertilizer is 10-20%. The utilization rate of potash fertilizer is 50-70%.There are many ways to improve the utilization rate of chemical fertilizer. How to improve the utilization rate of fertilizer has become a very important research topic all over the world. Currently, the most effective achievement is to use biological active additives to activate humic acid. Enhance its chemical and biological activities such as chemical synthesis, adsorption, chelation and microbial reproduction to effectively improve the utilization rate of chemical fertilizer.
1. Reduce nitrogen volatilization loss
Represented by urea and ammonium bicarbonate fertilizer, volatile, general utilization rate is low, farmers is generally accepted that its “critical and fierce, short,” after mixed with humic acid mixture, can improve the utilization rate of absorption of 20 ~ 40% (ammonium bicarbonate release of nitrogen absorbed by crops more than 20 days, after mixed with humic acid can be up to more than 60 days), farmers considered to be “slow, steady, long”.
2. Effect of humic acid on soil available nitrogen
Humic acid has various effects on the potential nitrogen in soil. The stimulation effect of humic acid increases the microbial spread in soil, leading to the acceleration of organic nitrogen mineralization. Humic acid has a higher base exchange capacity, which can reduce the volatilization loss of nitrogen and increase the content of available nitrogen in soil.
3. Effect of humic acid on phosphate fertilizer
Study of effects of humic acid on the phosphate fertilizer has been many years abroad. China has also conducted the research, the results showed that don’t add humic acid, phosphorus in the soil vertical movement distance of 3 ~ 4 cm, adding humic acid can be increased to 6 ~ 8 cm, nearly double, help crop root absorption humic acid and has the obvious effect on the decomposition of phosphate rock, and for the protection of available p and reduce soil available p and fixed on crop root absorption of phosphorus, the use of phosphate fertilizer absorption rate has very high value.
4. Effect of humic acid on potassium fertilizer
Effect of humic acid on k mainly displays in: the acidic functional groups of humate potassium ion, can absorb and store Potassium ions in sandy soil and Prevent loss in sand soil and leaching strong soil with water, and can prevent cohesive soil potassium fixation, for potassium silicate, erosion on potassium feldspar minerals, can increase the release of the slow decomposition, so as to improve the content of soil available potassium.
5. The synergistic effect of microfertilizer
Crop growth. In addition to nitrogen, phosphorus, potassium three elements, but also need calcium, magnesium, boron, manganese, copper, zinc, molybdenum and other medium, trace elements. They are a variety of enzymes in the body of crops, to promote the growth and development of crops, improve disease resistance, increase yield and improve quality have a very important impact. Sometimes it is not the lack of trace elements in the soil, but the amount of available parts that can be absorbed by plants is too low.The application of humic acid can have chelating reaction with refractory trace elements to produce humic acid trace elements chelates with good solubility and easy to be absorbed by crops, which is conducive to the absorption of roots or leaves, and can promote the transfer of absorbed trace elements from roots to the ground, which is not available in inorganic trace element fertilizers.