First, ammonium nitrogen fertilizer should not be mixed with alkaline fertilizers. Because ammonia will be produced after mixing, the effect of fertilizer will be reduced. Ammonium nitrogen fertilizers commonly used are ammonium bicarbonate, ammonium sulfate, etc., alkaline fertilizers are grass ash, lime and so on. Second, nitrate nitrogen fertilizer should not be mixed with organic fertilizer. Organic fertilizers contain more organic matter, and nitrate nitrogen fertilizers will cause nitrification under the action of denitrifying bacteria, resulting in loss of nitrogen. The commonly used nitrate nitrogen fertilizers include ammonium nitrate, sodium nitrate, and calcium ammonium nitrate. Third, nitrate nitrogen fertilizer should not be applied in Tanaka. Nitrate nitrogen fertilizer under anaerobic conditions is easily decomposed by denitrifying bacteria to cause nitrogen loss and reduce fertilizer efficiency. Dry land should be prohibited from pouring heavy water before or after heavy rain. Fourth, urea should not be poured. Because after applying the soil, urea will be hydrolyzed into ammonium bicarbonate by the action of soil microorganisms, and then it will decompose and volatilize ammonia. Fifth, urea should not adhere to the seeds. Urea contains a small amount of biuret, which can affect the germination of the seed. If the concentration is too high, it will poison the seed. When using urea as a seed fertilizer, do not directly touch the seed or control the amount of urea. Sixth, urea as top dressing concentration should not be too high. Used as foliar fertilizer, urea effect is indeed good, but can not blindly increase the amount. Seventh, ammonium bicarbonate should not be applied on the soil surface for too long. Do not apply shallowly, the nature of ammonium bicarbonate is not stable and should be covered immediately after application. Eighth, ammonium sulfate is not suitable for long-term application. Ammonium sulfate is an acidic fertilizer. Long-term application will increase the acidity of the soil and damage the soil structure. When applied to alkaline soils, sulfate ions interact with calcium ions to bind the soil. Therefore, use alternating with other nitrogen fertilizers. Nine is not suitable to apply on bogey nitrogen crops. If applied on bogey nitrogen crops, the physiological function of crops will be destroyed, and when serious crops will be killed.
Watermelon seed production company, within the territory of China, gansu province, ningxia province, yunnan and other places have a watermelon seed production base, breeding area of 2000 mu, the annual watermelon seed volume of 20 tons, seed production, according to international standard products for all seed purity
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