Q: What are the main points of the compound fertilizer application technology? Answer: One of the main points of compound fertilizer application technology is that it should be basal fertilizer. The reasons are: 1 The basal fertilizer can be applied deeply, which is beneficial to the absorption of nutrients by the crop roots in the middle and later stages. 2 The compound fertilizers are ternary compound fertilizers containing nitrogen, phosphorus and potassium. The basal fertilizer can meet the greatest need for phosphorus and potassium nutrients in the middle and later stages of the crop. 3 The application of basal fertilizer can overcome the difficulty of top-dressing phosphorus and potassium fertilizers in the middle and late stages. Q: If compound fertilizer is not used in the base fertilizer, can it be used as a top dressing after emergence? Answer: The second part of the technical application of compound fertilizers is that, in principle, it is not advisable to use ternary compound fertilizers as topdressing, but emphasizes the use of simple nitrogen fertilizers as topdressing, so that the ratio of nitrogen, phosphorus and potassium nutrients can be adjusted. The reason why the use of ternary compound fertilizer as top dressing is not advocated is to avoid the waste of phosphorus and potassium resources, because it is difficult for phosphorus and potassium fertilizers to exert their effects on the soil surface and the utilization rate in the season is not high. If no compound fertiliser is applied in the basal fertilizer, it can be topdressed after emergence, but it is better to apply the trench and apply the soil after the application. Q: There are some places that advocate the use of compound fertilizers as fertilizers for greenhouse vegetables. Is this right? A: Cucumbers, green peppers, tomatoes, and other vegetables are harvested several times. After each harvest, appropriate nutrients should be added. Fertilization can do this. However, in general, the content of soil available phosphorus in vegetable greenhouses is extremely high, and it is not necessary to use ternary compound fertilizer as fertilization. Of course, compound fertilizers used for flushing should use high-nitrogen and potassium-content, fully water-soluble compound fertilizers. Q: Can you use compound fertilizers as seed fertilizers? Answer: The third technical point of compound fertilizer application is that, in principle, high-level compound fertilizers cannot be used as seed fertilizers because high-concentration fertilizers are easily mixed with seeds to burn seedlings. If you must do the seed fertilizer, it is necessary to separate the seed from the fertilizer. Farmers in a certain area in the northeast have used the compound fertilizer with total nutrient content of 30% in the same trench as corn. The result has an impact on the emergence of corn. This lesson should be learned. Q: What problems should farmers pay attention to when applying compound fertilizers? A: Three issues should be noted: First, although the compound fertilizer is a good fertilizer, the application amount should not be too large. According to a peasant in Hubei province, the use of 12-6-7 compound fertilizers per mu for Chinese cabbage is as high as 200-250 kg. As a result, cabbage grows unsatisfactory. It is suggested that farmers should consciously go beyond the error of “more fertilizer and more productionâ€. Second, according to the type of crop to buy suitable compound fertilizer, some farmers regardless of the kind of cabbage or radish, all with 12-6-7 compound fertilizer is not appropriate. Because leafy vegetables like nitrogen, and the root vegetables like potassium, they should choose different compound fertilizers. The fertilizer is highly targeted and the effect is naturally good. Thirdly, the amount of compound fertilizer should be calculated based on phosphorus and potassium nutrition. Insufficient nitrogen can be used as a topdressing fertilizer to adjust nitrogen fertilizer, so that balanced fertilization can be achieved. Expert tips 1. Compound fertilizers are best used as basal fertilizers to meet the large demand for phosphorus and potassium in the middle and later stages of crops. 2. Compound fertilizer can not be used as seed fertilizer in principle. If it is necessary to do seed fertilizer, it must be done separately to avoid burning seedlings. 3. In principle, compound fertilizers do not advocate the use of topdressing because the phosphorus and potassium resources are wasted in the current season. Current Expert: Chen Lunshou (Professor, China Agricultural University) Corn Planter,Maize Planter,Planting Machinery,Corn Precision Planter Shandong Dahua Machinery Co.,Ltd , https://www.agrodahua.com