Tomatoes and cucumbers are the main vegetable species in Jiyang, Shandong Province. Excessive planting density is a common problem in the local area. The resulting serious plant growth and thin stalks are serious problems. According to the survey, the density of cherry tomatoes in Daguanzhuang Village, Panshi Town, is 30 cm. Each branch is 3 cm, equivalent to 10 cm in length. In Qudi Town, the cucumber spacing is generally about 25 cm, and the planting density is also high. .
In Jiyang area, the prolonged growth of vegetables and the weakness of the trees are one of the major problems affecting vegetable production. It is very common. Analyze the reasons, the impact of excessive planting density cannot be ignored.
According to reporters in Daguanzhuang Village, Yanshi Town, many vegetable farmers have very thin cherry tomato stalks, and the upper part only has straw thickness. With such a thin stem and too small leaves, the fruit development will not be very good. Because the yield per plant is directly proportional to the thickness of the stem. For example, the locally grown cherry tomato variety “Scorpio†belongs to the large-fruited cherry tomato variety. When planted in Shouguang and other places, it can grow to more than 20 grams, but in the local shed, the normal fruit shape is only about 10 grams. The dense planting, thin stalks, shaded leaves and poor photosynthesis are the main reasons for the small fruit.
In the town of Qudi, where cucumbers are more concentrated, the problem of planting dense vegetation is equally prominent. At present, cucumber varieties grown in greenhouses, such as Dongguan 4 and so on, are mostly characterized by small leaves and high light efficiency. However, when they are planted locally, the fact that the leaves are as big as basketball and the internodes are as long as 20 cm is common.
It is understood that the local outcome period is dominated by high-potassium fertilizers, and there has been no apparent partial application of nitrogen fertilizers. The phenomenon of leggy is so widespread that the reason for the excessive planting density cannot be ignored. When the reporter learned from the Sunsong Township, he discovered that many vegetable farmers purchased seed that could grow two sheds according to the dealer’s recommended density. However, according to the local planting density, the vegetable growers were planted in a shed and the planting density was very high.
If the density is too large, the leaves of the plants will be blocked each other and the light will be insufficient. In order to “race for†more sunlight, the plants will begin to “work hard†to grow upwards, and the internodes will become longer, the leaves will become larger, and the phenomenon of tall or leggy will appear. Under the same conditions, the photosynthetic products produced by the plants on a daily basis are certain, and more photosynthetic products for vegetative growth of stems, leaves, etc. are used, and fewer fruits are used to produce vegetables, and the yield is also low. Moreover, lack of photosynthetic products will greatly affect the differentiation of flower buds and fruit development of vegetables, such as the abnormal fruit of tomatoes and the melons of cucumbers, and the quality of vegetables will be significantly reduced.
Vegetable cultivation promotes proper close planting, but it is not as dense as possible. To solve the problem of vegetable growth, we must start by adjusting the planting density. There are differences in planting habits and density in different parts of the country, but overall there is not much difference. After planting tests in various places, the suitable density of tomatoes and peppers is 2000-2200 strains per mu, and the appropriate density of cucumbers is 2800-3000 strains per mu.