During the maturation period of tomato fruit in autumn and winter, when the outside temperature is getting lower and lower, when the greenhouse temperature is improperly controlled, the management of fertilizer and water and the adjustment of the plant are unreasonable, it will easily cause the fruit to turn slowly, color unevenly, and the commodity is poor. Even difficult to change colors. Therefore, management should pay attention to the following points:
1. The regulation of greenhouse temperature should be balanced. The suitable temperature for tomato fruit color conversion is 24-25°C, and the maximum temperature does not exceed 28°C. The nighttime temperature control is not lower than 12°C. The suitable temperature of the greenhouse helps to promote the red ripeness of the fruit. It not only matures quickly but also has good coloring and good fruit quality. Therefore, in management, the temperature of the greenhouse should be prevented from falling or falling suddenly, and the air should be placed in a top wind. Cold air should not be blown directly into the shed from the bottom.
2. The base leaves should not be excessive. During the tomato fruit period, some farmers believe that all the leaves at the bottom (below the ear) are not clear under the light and the fruit matures quickly. This is wrong. Because the photosynthetic products of the lower leaves of the tomato mainly provide nutrients to the root system. If the removal is excessive, it will easily lead to premature plant failure, resulting in empty fruit and slow color transformation. Therefore, if it is necessary to remove the yellow and old diseased leaves, if the leaves around the fruit are too large (large leaf type), too dense, after appropriate removal of 1-2 pieces, the remaining functional leaves must be preserved, so that it is both photosynthetic It is better not to be closed.
3. Water and fertilizer management should be reasonable. Tomato fruit into the mature coloring period, do not big floods and big fertilizers, avoid a lot of topdressing nitrogen fertilizer. If the fertilizer is too much water during the period, it will not only cause cracking, but will also lead to a sudden drop in the temperature of the greenhouse due to watering, slow color conversion or uneven coloration. Therefore, in the management of fertilizers and waters, it is necessary to apply watering at the appropriate time during the fruit expansion period, and to increase the application of potash fertilizer. Water should be poured in the expanded fruit water, and the soil should be kept moist during the ripening period of tomato growth. If the plant has deferred fertilizer during the mature coloring period, it can be sprayed with foliar fertilizer containing trace elements.
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