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我国南方酸性土壤含锌量一般是比较高的,但是长期施用大量石灰后,pH值就升高,锌与有机质的络合能力也就增强,而锌的有效性却降低,作物就会感到锌的不足。因此,在这时施以锌肥就有一定的效果。倘若土壤pH值在7以上,施锌肥效果就更好。水稻对锌肥较敏感,如果缺锌,初期时基部叶片有锈斑,进而连成条纹,同时根系不发达,须根少,且细而短,植株生长缓慢,无分蘖或少分蘖,直至
The amount of zinc in acidic soils in southern China is generally relatively high, but after long-term application of a large amount of lime, the pH value will increase and the complexing ability of zinc and organic matter will be enhanced. However, the availability of zinc will be reduced and the crop will feel zinc Insufficient. Therefore, zinc fertilizer at this time have a certain effect. If the soil pH value of 7 or more, zinc fertilizer is better. Rice is more sensitive to zinc fertilizer. If zinc is deficient, rust is formed on the base leaves at the initial stage, and then becomes streaks. At the same time, the root system is underdeveloped with less fibrous roots, thinner and shorter, slow plant growth, no tillers or fewer tillers until