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Practical Methods of Using Fertilizers to Control Crop Pests
1. Nitrogen fertilizer: Commonly used nitrogen fertilizers, such as urea, ammonium bicarbonate, and ammonia water, have stimulating, corrosive, and fumigating effects on pests, and are effective for controlling small, low-endurance pests such as aphids and red spider mites. When pests occur, spray a 2% urea solution or 1% ammonium bicarbonate solution on the leaves, once every 7 days, for 2--3...
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What fertilizer should be used to effectively prevent and control cotton premature senescence?
What fertilizer can prevent and control cotton premature senescence? Please allow me to explain the causes of cotton premature senescence: 1. Genetically modified hybrid insect-resistant cotton has a greater demand for potassium fertilizer than conventional hybrid cotton, and its absorption and conversion rate of potassium fertilizer is slower. If the amount of potassium applied is insufficient, potassium deficiency symptoms are very likely to appear; 2. There are now many old cotton fields and few new cotton fields...
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What are the methods for identifying controlled-release fertilizers?
What methods are used to identify controlled-release fertilizers? Please explain the identification methods. To identify genuine versus fake controlled-release fertilizer, you can refer to the following methods: The rub test: genuine fertilizer is not afraid of rubbing; its coating has good strength and high strength, and when you rub the granules with both hands, the coating does not lose color or come off; fake fertilizer is afraid of rubbing. Poor-quality or fake controlled-release fertilizer, because its strength does not reach...
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