The humic acid urea has good hygroscopicity, and the topdressing in the dryland is as far as possible after the rain so that the fertilizer dissolves quickly and is adsorbed by the soil. And because of the low temperature, it is not easy to volatilize ammonia. At the same time, some fertilizers can also be absorbed through the leaves to increase fertilizer efficiency and reduce losses. Do not use urea in direct sunlight at noon, otherwise it will increase the amount of ammonia volatilization, causing damage to the leaves and causing damage.
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