The so-called seed fertilizer refers to the fertilizer applied near the seeds or mixed with the seeds when sowing or planting. Experienced flower growers all know that fertilizers containing toxic effects such as urea contain a small amount of biuret. If the content of this substance is more than 2%, it will poison the seeds and seedlings; fertilizers containing harmful ions such as chlorine Potassium, ammonium chloride, such chemical fertilizers contain chloride ions, will produce water-soluble chloride after application, unfavorable for seed germination and seedling growth. Ammonium nitrate and potassium nitrate have a great influence on seed germination because they contain nitrate ions. Fertilizers with a corrosive effect, such as ammonium bicarbonate, are used as a seed fertilizer, which can cause serious damage to the seed germination and seedlings. Then, what kinds of fertilizers can be used as seed fertilizers when producing flowers and trees? Fertilizers are used as seed fertilizers. Because the seed fertilizers are often in direct contact with the seed or close to the seeds, the requirements for the type and amount of fertilizers are stricter. Once improperly applied, they can easily cause seed burning and rotten seedlings. Phenomenon, fertilizer can be used as a fertilizer as follows: First, ammonium sulfate. Suitable for a variety of flowers and trees as base fertilizer, seed fertilizer and top dressing. When seed fertilizer is applied with fertilizer, excessive contact of ammonium sulfate with seeds should be avoided. Seed dressing is an economical and effective method of applying fertilizer (2.5 kg per acre), but it should be ensured that the seed and ammonium sulfate are in a dry state, and they are not allowed to be stored for a long time. The second is superphosphate. Also known as general-pass calcium phosphate, abbreviated as calcium superoxide. Mainly as basal or seed fertilizer, as a fertilizer can reduce the fixation of phosphorus on the soil, help seedlings absorb phosphorus. Before the fertilizer is used, the calcium superphosphate should be finely ground and sifted. It is best to mix high-quality farmyard fertilizers to minimize the phenomenon of burning of seedlings caused by contact between superphosphate and seeds. For general fertilizer application rate of 7.5-10 kg is appropriate. Concentrated application of 10-20 kg per acre. It is advisable to disperse the application amount per acre to 20-30 kg. In the case of a limited number of SSP fertilizers, it is first considered as seed fertilizer. Superphosphate is a water-soluble phosphate fertilizer, which is a kind of alkaline phosphate fertilizer. It is especially suitable for the application of acidity in the red soil or yellow soil nursery. After the seedlings are unearthed, the phosphorus is easily absorbed by the seedlings. The third is heavy calcium phosphate. Heavy calcium phosphate is referred to as heavy calcium. When used as a seed fertilizer, it is appropriate to apply 2.5-5 kg ​​per acre. As heavy calcium superphosphate does not contain calcium sulfate, the effect of applying fertilizing on the heliolite plants is not as good as that of superphosphate. Some agricultural and livestock manure, manure, and other farmyard manures are used as seed fertilizers. There are sometimes dead seedlings, mainly because the fertilizer is not decomposed. Unfermented Fermentation Fertilizers release large amounts of heat during the fermentation process, which can easily burn the root system and release ammonia gas to burn the seedlings. Therefore, organic fertilizers such as unfamiliar farmyard manure should not be used, but must be subjected to high-temperature rot fermentation after being fully decomposed before they can be used as seed fertilizers. China Agricultural Network Editor
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