Current fertilizer and fertilizer application

Mr. Gu asked: Does the application of potassium chloride or potassium sulfate to rice and corn?

A: If it is not saline, potassium chloride is recommended because, first, potassium chloride is higher than potassium sulfate and is cheaper than potassium sulfate. Second, rice and corn are relatively chlorine-resistant crops. Most of the chlorine remains in the stems and leaves, and under normal fertilizing conditions, it will not adversely affect crop yield and quality. In addition, it has been reported that appropriate application of potassium chloride to rice can shorten the internodes of the base and increase lodging resistance.

Mr. Shen asked: I use calcium nitrate and diammonium phosphate as fertilization, respectively, after the dissolution of red powder, the effect is very good, but the two kinds of fertilizers mixed together, it is not easy to dissolve, this is how is it?

A: Calcium nitrate is easily soluble in water, and the aqueous solution is slightly acidic; Diammonium phosphate is also soluble in water, and the aqueous solution is alkaline. Both can be used for flushing. However, after the two fertilizers are mixed, the aqueous solution is neutral or alkaline. It will form calcium phosphate salts that are hardly soluble in water, so it is not suitable for fertilization. Mr. Shen did a little experiment on the fertilizer with unknown consequences before the application. This practice is very good and worthy of promotion.

Ms. Jiang asked: How much nitrogen, phosphorus, potassium do organic fertilizers contain? Can the nutrient content of organic fertilizer given in the fertilization manual be used to calculate the amount of fertilizer as fertilizer?

A: The main characteristics of organic fertilizers are a wide variety of ingredients that are complex and difficult to determine. The specific types and contents of nutrients differ depending on the source and maturity of organic fertilizers. The nutrients contained can be roughly divided into two kinds, fast-acting and delayed-effect. In addition to providing NPK nutrients for the current season crop, the organic fertilizer is also beneficial to follow-up crops and fertilization, and the composition of chemical fertilizers is relatively simple and clear. Mostly available nutrients, easy to measure and calculate. Therefore, the nutrient contents of organic fertilizers provided by various fertilization manuals can only be used for reference when fertilizing, for example, understanding the main components and contents of certain organic fertilizers, etc., to help determine the type and approximate amount of basal fertilizers, but it is difficult to calculate them. The specific organic fertilizer and the amount of N, P and K fertilizer applied with it.

Mr. Yao asked: What should I do if rice encounters heavy rain at the booting stage and is flooded?

A: The plants are submerged in water. If they are more than 48 hours, they will cause the death of the entire plant. If some plants are buried, soil nutrients, especially nitrogen, will be washed out and washed away, and they will be susceptible to pests and diseases. It is recommended to take the following measures in time:

(1) Drain the rice as soon as possible to expose the rice to the water. Note that the water cannot be drained all at once during the hot sun and the appropriate water layer must be retained.

(2) When retreating, it is necessary to remove the floating materials with the withdrawal of water; when the water just retreats the seedling tip, it must be cleaned, and the bamboo raft can be used to oscillate back and forth to wash away the silt of the contaminating stems and leaves.

(3) After draining, the rice plant will perform a light dew exposure when it recovers, and then combined with shallow irrigation water to make up for the available fertilizer. In the booting stage, it is necessary to apply 2.5 kg of urea and 3.5 kg of potassium chloride per mu during the break period of 3 to 5 days. In the stage of heading to the milk ripening stage, foliar fertilizers such as phosphorus and potassium fertilizers should be sprayed 1 to 2 times.

(4) Bacterial streak, bacterial blight, and sheath blight, etc. are easy to grow after being affected.

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