1, the excessive vegetative growth
Solanaceae vegetables of vegetative growth to reproductive growth is larger than many other varieties of vegetables, the influence of the tomato.Plant, vegetative growth to reproductive growth inhibition.once the tomato plants, often leads to difficult flowering, or flower fall easily, does the flower is bad, how do you sit still?Excessive growth is usually caused by the following reasons:
Improper low nutrient supply If tomatoes applying fertilizer, especially nitrogen fertilizer is overmuch, can make the plants absorb nutrients is overmuch, excessive is prone to plant growth.
Low temperature is too high High temperature within greenhouse, especially the night temperature is higher, the tomato will grow quickly, stem elongating stage quickly, very long, it is not easy to fruit.
When applying fertilizer containing hormone If fertilizer containing hormones, use the number of times is overmuch, can make tomatoes growing too rapidly, leading to nutritional imbalance, plant a moderate growth.
2, illumination reasons
Solanaceae vegetables mostly very bright light.Tomatoes are no longer the strong light, under the condition of weak light easily fallen petal fruit drop.If you can't put the tomato seed in direct sunlight or direct back shadow parts of the time is short, so is likely to result in "flower bloom again a year".(by the way remind: eggplant, cucumber, watermelon, some hot pepper varieties have this feature.)
3, high temperature influence the flower bud differentiation
If the inflorescence development in high temperature and drought, high temperature will affect the flower bud differentiation, appear even inflorescence of all or part of the flower flower abortive.And the temperature is too high that led to a moisture evaporates too fast, resulting in crop nutrient uptake of boron calcium must not affect normal flower bud differentiation has quite a relationship.Can't normal differentiation of bisexual flower, the fruit rate is lower.
The solution
1, the temperature management
Barn temperature is unfavorable and exorbitant, during the day and no more than 30 ℃, 35 ℃ temperature for 2 hours or more a affects the flower bud differentiation of tomato.General is 12 ~ 18 ℃ at night, the night temperature is unfavorable and exorbitant, otherwise there will be a moderate growth, stem out easily.
Shade can be sprayed with water to reduce the temperature in the greenhouse, choose a sunny day the shade at noon, spray once every 1 ~ 2 days of water, reduce the temperature in the greenhouse, with the reduction of temperature will gradually get flowers.
2, the use of growth regulators
The early stage of the tomato growth, can spray on a sunny afternoon with flourishing growth regulator (CCC, etc.);In addition, in the early flowering can use 2, 4-d (can only be painted flowers or dip, spray), gibberellin, and the element such as plant hormones processing tomato flower, blossom in gibberellin is used when the spray, flowering mid-term use fall prevention, the effect is better.
3, remove the blade
Vigorous part can be removed to adjust the blade looks like the tomato.Attention should be paid to moderate, so as not to harm the plants.
4, adding boron calcium and other nutrients
In plant growth too fast or high temperature lead to moisture evaporates quickly and cause the lack of calcium and other cases, can lead to crop of boron low calcium intake.Can be spraying on the leaf boron containing calcium and other trace elements in foliar fertilizer + sea elves biological stimulants, have the effect of balanced nutrition, flower and fruit.
