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叶面喷肥吸收快、利用率高。在干旱、水渍、根早衰或风灾根损伤等条件下,根系从土壤吸肥受影响;微量元素需要量少;磷、锌、硼、铁易被土壤固定,均更适宜叶面喷肥。喷肥最大的缺点是浓度稍高容易灼伤叶片,因此,生产上推荐的方法是大水量低浓度喷肥。国内农作物生长中后期喷尿素通常用1％～2％浓度,亩喷50～75公斤水。由于用工多,补充的肥料有限,就限制了叶面喷肥作用的发挥。为
Foliar fertilizer absorption fast, high utilization. In the condition of drought, waterlogging, premature root failure or wind damage, the root system is affected by the absorption of fertilizer from the soil; the requirement of trace elements is small; phosphorus, zinc, boron and iron are easily fixed by the soil and are more suitable for foliar fertilizer application. The biggest disadvantage of fertilizer is the higher concentration of easy to burn leaves, therefore, the production of the recommended method is a large amount of low-concentration fertilizer. In the latter part of the domestic crop growth, urea is usually sprayed with 1% -2% of the concentration, spraying 50-75 kg of water per mu. Due to the large number of workers, supplements limited fertilizer, limiting the role of foliar fertilizer. for