1. What nutrients are needed for crop growth
Under normal circumstances, fresh crops contain 75%-95% moisture and 5%-25% dry matter. About 95% of the dry matter is organic compounds, and only about 5% of inorganic compounds.
If the dry matter is heated and burned, almost all of its organic compounds can be oxidized and decomposed, and escape in the form of carbon dioxide, nitrogen, and water. The remaining residue is ash, which contains dozens of chemical elements, including those necessary for crop growth. Non-essential nutrients.
According to research, there are 16 essential nutrients for plants: carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, boron, manganese, copper, zinc, molybdenum and chlorine. Although these 16 nutrient elements occupy different weights in crops, they all play a very important role.
For example, the macro elements nitrogen, phosphorus, and potassium are very important to the growth of crops, but the middle and trace elements are also very important. The lack of any kind of trace elements will affect the normal development and growth of crops. In the process of crop growth, which nutrients are lacking should be supplemented in time.
2. The difference between chemical fertilizer and organic fertilizer
1. Fertilizer
Namely, chemical fertilizers are fertilizers made by chemical or physical methods that contain one or several nutrient elements required for the growth of crops. They are also called inorganic fertilizers, mainly including nitrogen fertilizer, phosphate fertilizer, potash fertilizer, micro-fertilizer, compound fertilizer, and so on.
Chemical fertilizer has high nutrient content, fast fertilizer effect, and strong fertilizer, but it generally does not contain organic matter, and it has no effect on improving soil and fertilizing.
2. Organic fertilizer
The main sources are animal and plant residues, animal and plant wastes, etc., which are carbonaceous materials that are applied to the soil to provide nutrients for crops. Organic fertilizers contain a lot of beneficial substances, such as various organic acids, peptides, and rich nutrients including nitrogen, phosphorus, and potassium.
It can not only provide comprehensive nutrition for crops, but also has a long fertilizer effect, which can increase and renew soil organic matter, promote microbial reproduction, and improve soil activity.
