Q: In the past, the use of diammonium phosphate as a base fertilizer or seed fertilizer had a good effect. Now, the fertilizer effect is not as good as it used to be. Instead, there are more yellow seedlings applied. How is this going to happen? Is the quality of fertilizer down?
A: It is not the quality of the fertilizer that has fallen but the change in soil nutrients and soil fertility. In the past, the black soil had high fertility, rich nitrogen, and appropriate application of some high phosphorus and low nitrogen diammonium phosphate on the line. With continuous high-yield planting and application of diammonium, soil organic matter and nitrogen content continue to decrease, while soil phosphorus is relatively cumulative. Under such circumstances, it is naturally not appropriate to apply high-phosphorus, low-nitrogen and potassium-free fertilizers. One-sided over-application of phosphate fertilizer also leads to the lack of trace elements such as zinc and iron. It is recommended to add organic fertilizer or returning straw to the field in the future. At the same time, it is necessary to apply nitrogen, phosphorus, and potassium fertilizers. If yellow fertilizers appear due to excessive partial application of phosphate fertilizer, timely application of suitable amount of nitrogen fertilizer or spraying of urea and other foliar fertilizers is recommended. .
Q: What is the most effective nitrogen-fixing fertilizer for any crop? Fertilizer and other fertilizers how to apply?
A: Nitrogen-fixing bacteria can convert free nitrogen in the air into effective nitrogen that the crop can absorb. The nitrogen-fixing bacteria fertilizer is widely effective, but it is best to apply sub-grass crops and leafy vegetables. Nitrogen-fixing bacteria are alive. Whether they are effective depends on whether they can meet the conditions of microbial activity. For example, the soil is too acidic, over-alkaline, too dry, and excessive. When the soil temperature is too low or too high, the effect will be reduced. In particular, the amount of nitrogen applied should not be too high, otherwise the nitrogen-fixing bacteria will not work. Although bacterial fertilizers have unique advantages, they cannot replace chemical fertilizers but must be applied in combination with other fertilizers. The method of blending differs depending on the fertilizer and can be directly mixed with the decomposed organic fertilizer and combined with the site preparation before sowing. Normally, do not directly mix with the chemical fertilizer, especially when the chemical fertilizer is too acidic and over-alkali and the application amount is large, the bacterial fertilizer will be inhibited. Microbial activity. The specific application method can refer to the instructions of the fertilizer.
Q: What are the characteristics of lotus root? How should fertilization be?
A: Lotus root is an herbaceous aquatic plant for many years. It is made from fresh stalks and lotus seeds. The growth and development are divided into three phases: the front of the leaf is the budding stage, the growth of the nutrients is stored by the earthworm; the period from the standing leaf to the beginning of the planting is the vigorous growth period, the nutrient absorption is large, and it is the critical period of topdressing; During the period, plant nutrients converged to lotus root and lotus seeds. The amount of fertilizer used for collecting lotus seeds and ploughing the glutinous rice fields was higher than that for the single lotus cultivars. Lotus root is a aquatic crop, with undeveloped root system, requiring fertile soil, applying decomposed organic fertilizer and a small amount of topdressing nitrogen and potash fertilizers. For example, Taiwan lotus root dressing can be as many as five or six times. Fertilization recommendations: for the main production of lotus fields, combined with ploughing before planting, Mushi rotted farmyard fertilizer 3000 ~ 5000 kg, general-purpose compound fertilizer 30 ~ 50 kg; in the beginning of the vertical leaves (field with a few vertical leaves) Mushi high nitrogen potassium Compound fertilizer 20 to 25 kilograms; sit in the beginning of the flood season (When Mantian Liye) Mushi high nitrogen and potassium compound fertilizer 15 to 20 kilograms. For the main producing lotus seed field, the fertilizing amount is slightly less than that of the calving field, and the top dressing is mainly based on top dressing, and the general type or high-nitrogen and potassium type compound fertilizer is applied in batches of 20 to 30 kg. In the acid soil area in the south, the base fertilizer can be applied with an appropriate amount of lime. Phosphate fertilizers are preferably used with superphosphate or calcium magnesium phosphate fertilizers, and potassium fertilizers are added.
Q: What should be done to develop special compound fertilizer or formulated compound fertilizer (BB fertilizer) for corn that is used once?
A: It is understood that there is currently no national standard for special fertilizers. The following opinions are for reference:
Emphasize fertilizer's specificity to soil and crops. First of all, we must make it clear that the special fertilizer developed is for use in northeastern spring corn or northeastern summer corn. Spring maize has higher soil fertility and is a single-season crop with a longer growth period. Compared with summer corn, the use of phosphorus fertilizer is higher, while the application of potash fertilizer is less, so the proportion of phosphorus in special fertilizer is relatively high, and potassium The proportion is relatively low. Summer maize has low soil fertility, especially the soil potassium content is at a critical level. Plus summer wheat and winter wheat rotation, you can use the effect of wheat phosphate fertilizer, so the proportion of phosphorus in its special fertilizer is relatively low, and the proportion of potassium is relatively Higher.
Because nitrogen has a relatively short fertilizer effect, it must be applied in divided doses not only as base fertilizer but also as top dressing. Therefore, the special fertilizer used for one-time application should have sustained-release properties, otherwise it is likely that the early-stage vigorous seedlings will be deferred. Therefore, it is recommended that manufacturers cooperate with units that develop or produce slow/controlled release fertilizers.
After the development of the fertilizer, a small area test should be conducted in the farmer's field and then promoted after success. If we want to form a commodity, produce it in large quantities, and market it, we must also follow the relevant regulations of the state to conduct regular, multi-point fertilizer plot trials and apply for approval by relevant units. The above opinions are also useful for the development of other new types of fertilizers.
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