What should be noted when applying nitrogen fertilizer?
How should foliar fertilizer be sprayed on wheat? Please provide guidance. After wheat flowers, it enters the key period of yield formation. Spraying foliar fertilizer from flowering to grain filling can effectively improve yield and quality. 1. Spraying method. 1. For spraying multi-dimensional monopotassium phosphate, use 100 grams of 99.5% multi-dimensional monopotassium phosphate per mu, dilute with 30 kg of water and mix evenly...
What should be noted when applying nitrogen fertilizer? Please provide guidance.When applying nitrogen fertilizer, the following points should be noted:
First, ammonium nitrogen fertilizer should not be mixed with alkaline fertilizers. Because after mixed application, ammonia gas will volatilize and reduce the fertilizer effect. Commonly used ammonium nitrogen fertilizers include ammonium bicarbonate, ammonium sulfate, ammonium chloride, ammonium acid, ammonium nitrate, etc. Alkaline fertilizers include calcium-magnesium fertilizer, plant ash, lime, etc.
Second, nitrate nitrogen fertilizer should not be mixed with organic fertilizer. Organic fertilizer contains more organic matter. When it meets nitrate nitrogen fertilizer, nitrification will occur under the action of denitrifying bacteria, causing nitrogen loss. Commonly used nitrate nitrogen fertilizers include ammonium nitrate, sodium nitrate, ammonium nitrate calcium, etc.
Third, nitrate nitrogen fertilizer should not be applied in rice fields. Under anaerobic conditions, nitrate nitrogen fertilizer is easily decomposed by denitrifying bacteria, causing nitrogen loss. The separated silver nitrate is lost with water, reducing fertilizer efficiency. Dry land should also prohibit application before and after heavy rain or watering heavily after application.
Fourth, urea should not be applied by irrigation. Because after being applied to the soil, urea will be hydrolyzed into ammonium bicarbonate through the action of soil microorganisms, and then decompose into ammonia and volatilize.
Fifth, urea should not be placed close to seeds. Urea contains a small amount of biuret, which affects seed germination. When the concentration is too high, it will poison the seeds. When using urea as seed fertilizer, do not let it directly contact the seeds or control the amount of urea applied, and it should not exceed 2.5 kg per mu.
Sixth, the concentration of urea used as topdressing outside the roots should not be too high. Used as foliar fertilizer, urea is indeed effective, but blindly increasing the amount will backfire. The suitable application concentration is 0.8--1% for grain and cotton crops, and 0.4--0.6% for high-efficiency economic crops such as fruit, vegetables, tea, and medicinal plants.
Seventh, ammonium bicarbonate should not be applied on the soil surface. Avoid shallow application. Ammonium bicarbonate is unstable in nature and should be covered with soil immediately after application.
Eighth, ammonium sulfate should not be applied for a long time. Ammonium sulfate is an acidic fertilizer. Long-term application will increase soil acidity and destroy soil structure. When applied on calcareous soil, sulfate ions will combine with calcium ions and cause soil compaction. Therefore, it should be applied alternately with other nitrogen fertilizers.
Ninth, ammonium sulfate should not be applied in paddy fields. Because after application, it will fall into the oxygen-deficient reduction layer, and sulfate will be reduced to hydrogen sulfide, forming black ferrous sulfate around the rice roots, causing black roots and nutrient loss.
Tenth, ammonium chloride should not be applied to chloride-sensitive crops. Applying it to chloride-sensitive crops such as sugarcane, sugar beet, potato, citrus, grape, tobacco, etc. will produce side effects, destroy the physiological functions of the crops, and even cause death, and reduce the quality of the harvest.
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