These kinds of organic fertilizers should be cautious to determine the quality of organic fertilizer raw materials. Tianjiatun, a fertilizer expert at Northwest Agriculture and Forestry University, recently reminded farmers to use five kinds of things, such as sludge from urban sewage, weathered coal, and waste from paper mills. Do not use organic fertilizer, otherwise it will not only have no fertilizer effect, but also damage crops.
Although the sludge deposited by urban sewage contains a certain amount of organic matter and NPK components, heavy metals and E. coli are seriously exceeded, which may lead to dead roots and dead trees. Fruits may cause malignant cancer after eating.
Deep sludge of industrial wastewater Although this sludge also contains a large amount of elements and organic matter, heavy metals are also seriously exceeding the standard, which can cause rotten roots, dead trees, and seriously pollute the soil.
The waste material produced by the paper mill's scrap is mainly composed of lignin, which is an organic matter that is extremely difficult to absorb. It has great damage to the soil and has a great influence on the roots.
Weathered coal belongs to the apparent organic matter and cannot be the carbon source of soil microbes. The real active ingredient in weathered coal is humic acid, but not deep processing is an ineffective organic nutrient. The waste of the MSG factory waste MSG factory has strong acidity. Although it is a food waste, it is not necessarily a good raw material for organic fertilizer.
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