Pruning fallen vines is one of the important techniques to prolong the growth period of greenhouse vegetables and achieve high quality and high yield. In the annual cultivation of cherry tomato in greenhouse, the techniques of single stem continuous topping pruning and vine falling can make the leaves evenly distributed, keep a reasonable light position, improve photosynthetic efficiency, plant grow vigorously, produce more fruits, and have high yield and excellent quality.

First, variety selection. Choose mid-late maturity varieties with strong growth potential, long fruiting period and overhead cultivation, such as Shenghongguo, Hong Qian L and Japanese Jindou. According to the specifications of L-meter wide row and 0.6-meter narrow row, ridge cultivation is carried out, and about 3000 plants are planted per mu.

Second, pruning technology. When the trunk bears two ears, leave two leaves at the top to pick the core. This branch is called the first branch. When the fruit of the first inflorescence begins to harvest and the fruit of the second inflorescence begins to swell, a strong lateral branch remains under the top panicle to continue to grow instead of the main stem. According to the growth of the plant, the secondary fruiting branch is the second fruiting branch after two ears of fruit grow on the side branch. When the fruit of the second fruiting branch begins to harvest, select a strong lateral branch from its upper part as the third fruiting branch, and so on. During the whole growth period, the panicle was changed for 6- 17 times, leaving 6- 17 fruiting branches and l2-l4 panicles per plant.

After retaining the branch, all other side branches should be erased, and side branches should not be knocked out prematurely. Generally, when it grows to more than 20 cm, two leaves should be reserved to be knocked off, so that the lateral branches can be better utilized and the growth of tomatoes can be promoted.

Third, the vine-dropping technology. Water should be controlled before the vines are turned upside down to reduce the water content of stems and vines and enhance their toughness. Rattan falling should be carried out in the sunny and warm afternoon, when the water content of the stems and vines is low, the tissue is soft and the operation is convenient, so as to avoid and reduce the damage to the stems during rattan falling. When the vines fall, the old yellow leaves and diseased leaves at the lower part of the vines should be removed and taken outside the shed for burial or incineration. All the fruits in this part should also be harvested to prevent the leaves and fruits from getting sick on the wet ground after falling vines, forming a diseased heart. Hang vines when the first inflorescence opens. After the fruit of the first fruit branch was harvested, the first ear of the second fruit branch expanded rapidly, and when the second ear set fruit, the vine dropped 1 time. After that, each fruiting branch will fall 1 time after harvest.

Take the method of cross-falling vines between plants, that is, untie the plants from the rope, knock off the old leaves at the lower part, gently twist the plants to the position of the same-nearby plants, and then hang the vines. The fallen vines should be neatly oriented in the same direction and gradually coiled on both sides of the cultivation ridge. When winding stems and vines, take the natural bending of stems and vines as the degree, and do not bend forcibly or reversely to avoid winding or breaking. Every time the vines fall, the leaves and stems should be kept about l5 cm away from the ridge surface, each plant should keep more than 20 functional leaves, and the plant height should be kept at 0. 8 meters (south of the shed) ratio 1. 5 meters (north of the shed). It should be noted that the top of the stem in the front row should not exceed the back row to avoid shading. Ensure that the leaves are evenly distributed, always in the best position of stereoscopic illumination and the best state of leaf area, and keep the leaf area coefficient at 3-4. The vines will drop 5-6 times during the whole growth period.

Fourth, management after pruning and falling vines

1. temperature: within a few days after pruning, the temperature in the shed should be raised appropriately to promote the healing of the wounds of the injured stems and vines. The temperature should be kept at 20-25 degrees Celsius during the day and around l5 degrees Celsius at night.

2. Spraying: According to the common diseases of cherry tomatoes, prochloraz, botrytis cinerea, chlorothalonil, mancozeb and other chemicals are sprayed after pruning and vine falling to prevent leaf mold, botrytis cinerea and epidemic diseases in the morning and evening. When spraying pesticides, seasonal rain lOl foliar fertilizer can be added, which can not only prevent diseases, but also increase production.

3. Fertilizer and water management: although the vine can reduce the fruiting position of plants, it can not shorten the actual distance between the fruiting position and the root system. In addition, more and more nutrients, such as insufficient supply of fertilizer and water, will cause problems such as worse and worse fruit quality and smaller fruit. Therefore, sufficient fertilizer and water should be supplied to meet the growth needs of plants. Topdressing is mainly potassium fertilizer such as potassium sulfate, with topdressing of L5-20kg per mu and watering at the same time.

4. Branching and picking old leaves: After picking the fruits on the fruiting branches, the side branches located below the branches should be knocked out in time to ensure the nutritional supply of the fruiting branches, and all the leaves below the fruiting branches should be removed at the same time. In order to ensure the good development of the upper fruit, the leaves on the ear cannot be removed. Branching and picking old leaves should be done in sunny days to facilitate wound healing. In order to avoid the spread of tobacco mosaic virus, the hand that breaks the fork only touches the fork, not the whole stem. When picking leaves, try to remove the leaves close to the branches, and be careful not to leave petioles to avoid gray mold.