When it comes to organic fertilizer, people first think of livestock and poultry manure, stinking, in fact, organic fertilizer has now entered the commodity era, farmers still face some confusion when choosing organic fertilizer, what is the real Organic fertilizer? On August 18th, at the 2015 China Organic Fertilizer Forum, Wu Yuguang, a senior agrochemical expert from Zhongnong Holdings, and Yan Baofu, a senior agronomist, answered the practical questions of organic fertilizer selection and application for several organic farmers. Xiaobian will organize it as follows for reference.
Question 1: What organic fertilizer should be selected for the raw material?
Experts answer: The choice of organic fertilizer must first start with raw materials. Organic fertilizer raw materials are more extensive, there are more than 1,500 kinds. We need to know whether an organic fertilizer is suitable for a piece of land. The first thing to know is whether its raw materials are suitable for this land. In the current organic agricultural production, we should first exclude urban garbage and municipal sludge, including industrialized organic fertilizers containing some heavy metals that have not been treated with high temperature or harmlessness.
Secondly, we generally choose some straw, food essence or some food waste, or some organic oils produced from such raw materials containing vegetable protein, such as oil, soybean meal and peanut meal. This organic fertilizer has passed high temperature and no Harmful treatment itself has a strong chelation. After entering the soil, it can feed a large number of microorganisms, and can directly supply nutrients to crops.
At the same time, these organic matter are the synthesis of various complex acids, which can chelate a large number of elements in the soil. Therefore, when using this organic fertilizer, the problem of a micro-environment of the soil can be solved, and the physiological changes of the growth of the shoots above the ground can also be solved. Problems, and can continue to improve the soil and produce some quality agricultural products.
Question 2: Is there a difference in organic fertilizers from different production processes?
Experts answer: The organic fertilizer production process mainly consists of either complete fermentation or semi-fermentation. It mainly depends on whether the high temperature sterilization process has passed, and then it can be judged whether it has undergone harmless treatment. The production of organic fertilizer must be processed at a high temperature of 450 degrees Celsius or higher.
The appearance of organic fertilizers also has a selection criteria. If it is cultivated in a protected area, it is recommended to use powder. If it is cultivated in the field, it is recommended to apply extrusion granulation. Under normal circumstances, the organic content of extrusion granulation is higher than that of disc granulation and spray granulation, while powder The organic matter content of organic fertilizer can reach higher.
Question 3: Is there a simple way to judge the pros and cons of organic fertilizer?
Experts answer: The test method for powdered organic fertilizer is to directly put the powdered organic fertilizer in a cup of water. If it is floating, it is a qualified organic fertilizer. If it sinks directly, then this organic fertilizer may have problems. Because organic matter is lighter than water. To detect granular organic fertilizer, just put it in water and see the solubility. Under normal circumstances, the more precipitation, the worse, the higher the solubility, the better.
The following methods are also available:
One touch: slippery and dry, picking up the group to touch the high-quality fertilizer.
Second smell: It is better to have a little fragrant and distiller's taste.
Third look: grayish white is excessively decomposed, generally not recommended. The field uses mostly semi-fertilized organic fertilizer. This fertilizer continues to be fermented in the ground and can be combined with organic matter in the soil to form a new humus with better effect.
It should be noted that the role of organic fertilizer is a very long process. The degradation rate of the year will not exceed 30%, and the process of fertilizing the soil requires a process.
Question 4: Is there any difference in the choice of organic fertilizers in the South and the North?
Experts answer: As long as the organic fertilizer you buy is qualified, it is no problem to use in the south and north. In the south, as long as the pH of the organic fertilizer is greater than 6.5, the pH value is not explicitly required in the north, as long as it is not a strong acid organic fertilizer.
In the South, it is not necessary to deliberately use alkaline organic fertilizer. The so-called alkaline organic fertilizer is only a concept. The organic fertilizer itself is composed of a variety of organic acids. The main function of the organic fertilizer is to buffer the pH of the soil. It only works after being applied to the soil, and is not directly related to the pH of the fertilizer itself.
Question 5: What is the difference between ordinary organic fertilizer and organic fertilizer obtained by organic certification?
Experts answer: Organic fertilizers that have obtained organic certification refer to fertilizers that can be used in organic agricultural production. The indicators such as heavy metal content are within the control range. Organic matter can be directly absorbed and utilized by crops. Generally, the price is high and the absorption rate can be absorbed. High, has a significant effect on soil improvement, and helps to eliminate heavy and underground soil-borne diseases. Ordinary organic fertilizers only meet national standards. (Li Junxia Jiao Peipei)
Website: Organic fertilizers are harmful to the environment? Experts tell you what is real organic fertilizer
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