Fertilization hotspots focus on solutions

Mr. Yang from Henan Province: What fertilizer should the pepper seedlings be selected? How much is the amount?

Answer: If compound fertilizer is used, it is better to use ternary compound fertilizer and the amount must be less. Or use ammonium sulphate and superphosphate, and use less. Do not use high-nitrogen fertilizers such as urea to avoid burning seedlings.

Mr. Wang of Liaoning Province: Maize rotted up and down with roots red. What is the reason?

Answer: This situation is caused by corn blight. It is prone to occur when corn has low temperature, high rainfall, and high humidity. Mainly through the selection of resistant varieties, seed carbendazim and other fungicides coating and other methods for prevention. In addition, appropriate seed fertilizer was applied at the time of sowing to cultivate strong seedlings and enhance disease resistance of corn seedlings.

Mr. Cui of Jilin Province: Use 50 kg of compound fertilizer with 50% of total nutrients per acre, and make a one-time end-use application on corn. Can it not be top-dressed in the later period?

A: If it is sandy soil, due to poor fertility, nutrients are easy to lose. After fertilization, the effect is fast, but the stamina is small, so the sand soil is recommended to add base fertilizer and top dressing. Due to the high base fertilizer content and large amount, if the base fertilizer is a high-nitrogen slow-release compound fertilizer, the amount of topdressing fertilizer can be appropriately reduced when topdressing. If it is a sticky soil with good fertility, a large amount of rain may cause nutrient loss during the middle period of corn growth. This situation also requires a moderate amount of top dressing.

Mr. Zhang in Xinjiang: How effective is the use of foliar fertilizer?

A: First select the appropriate variety. In the initial stage of crop growth, in order to promote its growth and development, it is necessary to select the regulation of foliar fertilizer; if the crop lack of nutrients or the root growth ability of the late growth period decline, nutrient foliar fertilizer should be used.

Second, the spray concentration should be appropriate. The concentration is too low for the fertilizer to be exerted, and the concentration is too high for the occurrence of fertilizer damage, especially trace element fertilizers.

Also note that the spraying time should be appropriate. Foliar fertilization is best sprayed in the windless evening or without dew morning. The rain should be sprayed once in 3 hours, but the concentration should be reduced properly. Spraying should be uniform. The number of sprays should not be too small and there should be intervals.

Mr. Jin, Liaoning Province: What problems should be paid attention to when fertilizing peanuts?

Answer: The absorption of nutrients by peanuts is less at the seedling stage, full fruit stage, and maturity stage, and there are more flowering needles and knots. The absorption of nitrogen, phosphorus, and potassium is the most nitrogen, followed by potassium, and the least phosphorus. The nitrogen absorbed by peanuts mainly comes from root nodules, and peanuts are hi-calcium crops. Adequate calcium can reduce the rate of empty pods and increase the fullness of pods. Therefore, fertilization of peanuts should use low-nitrogen and high-potassium phosphorus as the base fertilizer, such as soil phosphorus deficiency, appropriate increase in the ratio of phosphate fertilizer in the base fertilizer, according to the appropriate growth in the late stage fertilizer, top nitrogen and potassium fertilizer with the appropriate application. Also pay attention to calcium, boron and other trace elements.

Mr. Wang, Beijing: How should summer corn be fertilized?

A: The growth of summer corn is synchronized with the temperature and humidity of the weather, which is conducive to its rapid growth. Maize seedling stage, jointing and booting stage, heading and flowering stage, and maturation stage. The absorption of nutrient elements in maize is generally the most during jointing and booting stage, and the absorption ratio of nitrogen, phosphorus and potassium is approximately 2:1:2. Because the activity of soil phosphorus increases with the increase of summer temperature, it is beneficial to the absorption and utilization of crops. It is recommended to use high-nitrogen, low-phosphorus and high-potassium compound fertilizer as the base fertilizer. The base fertilizer should be sufficient to facilitate the cultivation of strong seedlings. In the small bell-mouth topdressing nitrogen and potassium topdressing, the amount of topdressing depends on the condition of the seedlings, and a large amount can easily cause corn gluttony to mature.

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