Tomato cracking fruit is a disease that occurs in autumn and is a serious disease in autumn, which makes vegetable farmers very headache. However, in the prevention and treatment of tomato cracking, in addition to the comprehensive measures such as scientific water and fertilizer management and rational regulation of the greenhouse environment, it is difficult to find an effective agrochemical product to prevent cracking. After a lot of experiments, ingenious spraying with 20-30ppm gibberellin can effectively prevent tomato cracking.
Gibberellin is sprayed on the top of the tomato (seventh spike) and sprayed with the size of the bean (not suitable for spraying at the flowering stage to prevent the fruit from being poor or the plant length). At this time, the tomato is in the color changing period. The tomato in the middle ear position is in the period of fruit expansion. Spraying gibberellin can play the role of stretching the pericarp cells and promoting the growth of the peel, thus achieving the purpose of preventing cracking.
The concentration of gibberellin should be strictly controlled, and if the concentration of spray is too large, it will easily form a hollow fruit, which will also reduce the benefit. Under normal circumstances, when the temperature in the shed exceeds 25 °C, the spray concentration can be 20ppm; if the temperature is lower than 25 °C, the spray concentration should be slightly increased, and sprayable 25-30ppm. In addition, it should be noted that the tomato varieties are different, and the spray concentration is also different. It is best to test the small area before spraying, and then promote it in a large area.
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