Fertilizer use should be scientific to avoid fat damage
Fertilizer is an important method of scientific fertilization, but the application of seed fertilizer is technically strong, especially the choice of seed fertilizer is very particular. The improper use can easily damage the seed and its rooting and germination, thus delaying the season and causing losses. In the selection of fertilizers, there are the following "four bogeys".
Avoid corrosive fertilizers such as ammonium bicarbonate, ammonia, etc., which are volatile and corrosive. They are easy to smear seeds and seedlings. Superphosphate contains free sulfuric acid and phosphoric acid, which may cause damage to seed germination and seedling growth. Generally, it is not suitable for seeding. fat. This type of fertilizer should be applied during tillage, or applied to the lower layer of the seeding ditch, not in direct contact with the seed, or mixed with soil and fertilizer.
Avoid using the toxic fertilizer urea. During the growth of the crop, a small amount of adipic acid is often formed. If the content of the adipic acid exceeds 20%, the seed and the seedling will be poisoned. In addition, urea molecules with high nitrogen content penetrate into the protein molecules of the seed, denature the protein, and poison the seed germination and radicle.
Avoid strong alkaline fertilizers, strong alkaline fertilizers, such as kiln ash potassium fertilizer, steel slag phosphate fertilizer. The kiln ash potassium fertilizer contains more calcium and has strong water absorption. After absorbing water, it forms mature lime, which releases a lot of heat and easily burns out seeds and radicles. When planting fertilizer, it must be mixed with organic fertilizer higher than 10 times, applied to the lower layer of seeding ditch (hole), not in direct contact with seeds, and pay attention to covering soil after sowing to prevent damage.
Avoid using unfertilized farmyard manure. Generally, the fully decomposed farmyard manure can be used as a seed fertilizer. It is applied near the seeds at the time of sowing, and the effect is very good. However, if the unfertilized farmyard manure is used as a seed fertilizer, the fertilizer will release a lot of heat energy during the fermentation process, which not only causes burnt roots, but also releases ammonia gas and burns the seedlings. The farmyard manure should be fermented by high temperature after being piled up, and fully fermented before use as a seed fertilizer.
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