Apple lobular disease is the effect of zinc deficiency in apple zinc deficiency. Zinc deficiency can make apple leaf area smaller, cell volume increase, palisade tissue smaller, specific leaf weight lower, chlorophyll total decrease, and photosynthesis intensity lower. The growth and development of apple trees after zinc deficiency is blocked, leading to the occurrence of lobular disease. The incidence is related to the decrease of acetic acid content in the stem tip. The typical symptoms are as follows: the new tip is impeller, small and narrow, and the fragile is tabby; The base is bare, and when it is severe, it forms a tip; the flower is small and not easy to bear fruit, the fruit is small and deformed; the root of the old tree has decay.
Specific measures have found that apple trees consume more zinc during the germination stage, the new shoots and the flower bud differentiation stage, which is the best period for zinc application. The apple orchard is supplemented with zinc in a large area, and can be applied in the autumn. Generally, zinc Zn-SO4·H2O1~2 kg of zinc sulfate is applied per mu, and it is best to mix it with organic fertilizer and then apply it. For the treatment of apple tree zinc deficiency or mild lobular disease, 0.5% zinc sulphate plus 1% urea solution can be sprayed 1~2 times in 1~2 weeks before germination in spring or 3 weeks after germination.
Promotion prospects China's main apple producing areas are concentrated in the Loess Plateau and the Bohai Sea region. In recent years, the planting area has reached 2.27 million hectares. Most of these areas are calcareous soils with high pH and low zinc availability. The soil sampling analysis results show that the apple orchard has zinc deficiency problems to varying degrees, and the zinc deficiency in the old orchard is more serious. The potential of zinc fertilizer promotion and application is huge.
This article URL: Apple lobular disease is zinc deficiency, the effect of apple planting using zinc fertilizer
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