Tomato reason analysis:
Tomato plant leggy mainly due to soil moisture, relative humidity of about 80%, more nitrogen fertilizer, or continuous rainy weather, air humidity is often higher than 50% -60%, lack of light, colonization too dense, or poor ventilation and ventilation. The temperature of autumn tomatoes is too high, nitrogen fertilizer is too high, and the lack of timely planting is also easy.
Its main preventive measures are as follows:
First, control the seedling age, timely planting
Strictly control the seedling age, such as the general early-maturing tomato seedlings age about 60 days, the mid-late maturing varieties should be 70 to 80 days, the autumn tomato seedlings about 25 days.
Second, early preparation for planting, promote seedlings and seedlings
10-30 days before planting, do a good job in soil preparation, basal fertilization, covering the top film and skirt of the greenhouse, drainage around the shed, etc., so that when the larvae are planted, the humidity in the shed is lower and the temperature is higher, which is conducive to easing seedlings.
Third, control the amount of nitrogen fertilizer, using deep sorghum cultivation to promote root growth.
Fourth, timely pruning and pruning, put a frame, so that ventilation and good ventilation, and the use of growth regulators such as anti-dropping flower spray, promote fruit set, inhibit excessive vegetative growth.
Fifth, the application of pharmaceutical agents
After planting seedlings, shoots were sprayed every 15 days with equal volume of Bordeaux mixture or 77% of WP 500-700.
Six, timely ventilation
After the plants are rejuvenated, they should be allowed to ventilate and reduce the humidity in the shelter while maintaining a certain temperature. The beginning of fruiting and fruiting, it is necessary to put under the skirt of the end of the wind, the minimum temperature outside the night when not less than 15 °C, stay up late to be ventilated. Into the hot summer season, the plastic film can be removed, as in open field cultivation.
Seven, control fertilizer
Bottom fertilizer is sufficient, generally do not apply fertilizer before flowering and fruit setting, especially the use of mulching, after sitting on the fruit, it began to appropriate fertilizer according to the situation.
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