Q: In the past, the use of diammonium phosphate as a base fertilizer or seed fertilizer was very effective. Now the fertilizer effect is not as good as before. If it is applied, it will appear yellow seedlings. What is going on? Is the quality of fertilizers reduced?
A: It is not that the quality of the fertilizer has decreased, but that the soil nutrients and soil fertility have changed. In the past, black soil had higher fertility and nitrogen, and it was good to apply some high-phosphorus and low-nitrogen phosphate. With the high-yield planting and application of diammonium in successive years, the soil organic matter and nitrogen content are continuously decreasing, while the soil phosphorus is relatively accumulated. Under this circumstance, the fertilizers that are still applied with high-phosphorus, low-nitrogen and potassium-free are naturally not used. Excessive application of phosphate fertilizer on one side can also lead to the lack of trace elements such as zinc and iron. It is recommended to add organic fertilizer or return straw to the field in the future, and at the same time apply nitrogen, phosphorus and potassium fertilizers together; if yellow seedlings appear due to excessive application of phosphate fertilizer, timely application of appropriate amount of nitrogen fertilizer or spraying of foliar fertilizer such as urea .
Q: What crops are most effective for nitrogen-fixing bacteria? How is bacterial fertilizer applied in combination with other fertilizers?
A: Nitrogen-fixing bacteria can convert free nitrogen in the air into effective nitrogen that crops can absorb. Nitrogen-fixing bacteria fertilizer is widely and effective, but it has the best effect on the application of grass crops and leafy vegetables. Nitrogen-fixing bacteria are animate. Whether it is effective or not depends on whether the microbial activity conditions can be met. For example, when the soil is too acidic, over-alkaline, over-salted, over-soiled, and the soil temperature is too low or too high, the effect will decrease. In particular, the amount of nitrogen applied should not be too much, otherwise the nitrogen-fixing bacteria will not work. Although the bacterial fertilizer has unique advantages, it cannot replace the fertilizer, but it should be combined with other fertilizers. The compounding method varies depending on the fertilizer, and can be directly mixed with the decomposed organic fertilizer, and combined with the soil preparation before sowing; generally, it should not be directly mixed with the chemical fertilizer, especially when the chemical fertilizer is too acidic, over-alkali and the application amount is large, the bacterial fertilizer is inhibited. Microbial activity. Specific application methods can be referred to the instructions for bacterial fertilizer.
Q: What are the characteristics of lotus root? How should I apply fertilizer?
A: Lotus root is a herbaceous aquatic plant for many years, with fresh stems and lotus seeds as products. There are three stages of growth and development: the germination stage before the leaves, the growth of nutrients by the sorghum storage; the strong growth period from the lobes to the beginning of the sputum, the nutrient absorption is large, is the key period of topdressing; from the knot to the harvest for the scar During the period, the plant nutrients are concentrated in the lotus roots and lotus seeds. The fertilization amount of the lotus seed and the picking powder field is higher than that of the single lotus root. Lotus root is an aquatic crop, the root system is underdeveloped, the soil is fertile, the decomposed organic fertilizer is applied, and a small amount of nitrogen and potassium fertilizer is applied. For example, Taiwanese lotus root topdressing is as many as five or six times. Fertilization recommendation: For the main production of lotus roots, combined with pre-planting and ploughing, 3,000 to 5,000 kg of fertile farmyard manure, 30 to 50 kg of general-purpose compound fertilizer; and high-nitrogen potassium at the beginning of the initial stage (a few leaves in the field) Type compound fertilizer 20 ~ 25 kg; at the beginning of the sitting period (when the field is full of leaves), the application of high nitrogen and potassium compound fertilizer is 15-20 kg. For the main lotus seed field, the amount of fertilization is slightly less than that of the paddy field, and the top dressing is mainly for the initial flowering period, and the general-purpose or high-nitrogen potassium compound fertilizer is applied in 20 to 30 kg. In the southern acid soil area, the base fertilizer can be applied with a suitable amount of lime, and the phosphate fertilizer should be superphosphate or calcium magnesium phosphate, and the potassium fertilizer should be added.
Q: How do you start to develop a special compound fertilizer or a compound compound fertilizer (BB fertilizer) for corn one-time application?
A: It is understood that there is no national standard for special fertilizers. The following comments are for reference:
Emphasize the relevance of fertilizers to soils and crops. First of all, it is necessary to clarify whether the special fertilizer developed is used for northeast spring corn or north China summer corn. Spring maize has higher soil fertility and is a single-season crop with a longer growth period. Compared with summer maize, the application rate of phosphate fertilizer is higher, while the application rate of potassium fertilizer is less, so the proportion of phosphorus in special fertilizer is relatively higher, while potassium. The proportion is relatively low. The soil fertility of summer maize is low, especially the soil potassium content is at a critical level. In addition, the summer maize is mostly rotated with winter wheat, and the effect of wheat phosphate fertilizer can be utilized. Therefore, the proportion of phosphorus in the special fertilizer is relatively low, while the proportion of potassium is relatively low. Higher.
Because nitrogen fertilizer has short fertilizer effect, it is used as base fertilizer and top dressing, and must be applied in several stages. Therefore, the special fertilizer for one-time application should have sustained release property, otherwise it may happen that the early stage of seedlings and the later stage of de-fertilization. Therefore, it is recommended that manufacturers cooperate with units that develop or produce slow/controlled release fertilizers.
After the fertilizer is developed, a small area test should be done in the farmer's field first, and then promoted after successful. If it is necessary to form commodities, mass production and listing, it is necessary to conduct regular and multi-point fertilizer community tests in accordance with relevant state regulations, and report to relevant units for approval. The above comments also have reference significance for the development of other new fertilizers.
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