Management measures of cherry over-summer in greenhouse

First, pay attention to summer shears. While removing the film, it is necessary to retract the crown in time and carry out heavy strength pruning.

1. Return to the leadership of the Central Committee. This method can reduce the overall height of each cherry crown by 50-80 cm, preventing the tree from growing higher and higher, affecting indoor ventilation and light transmission conditions.

2. Pruning and thinning the main branches. It is necessary to re-cut the strong main branch and the mediocre main branch, let it retract to the middle or rear branch, and re-cultivate and develop into the main branch.

3. Prune each branch group. It is necessary to carefully prune the groups and branches of the main branches and trunk, remove dense chicken claw branches, erect branches, overlapping branches and peripheral competitive branches, cut heavy short medium-long branches, and retain the flat and oblique mediocre branch group.

4. Cultivate new fruiting branches. After re-pruning, the tree will stimulate a large number of new buds and new branches, which should be cultivated into new main branches or fruiting branches if the position is suitable; if the position is not suitable, the sprouting should be removed in time and cleaned up between layers.

II. Fertilizer and water management

1. Topdressing and watering. Fertilization should be carried out in time after the film is removed, and between every two plants in each row, a fertilizer application ditch with a depth of 30 cm, a width of 30 cm from north to south and a length of 100 cm from east to west should be dug, and 250-300 grams of nitrogen, phosphorus and potassium compound fertilizer should be applied to each ditch. After sealing the soil, it will be restored to a high ridge, covered with plastic film, sprinkled on the film and sealed. Combined with trenching, the exposed roots should be cut off, and the roots should be renewed and shrunk to reduce the amount of roots and control the expansion of the tree. When digging ditches, be careful not to shovel the agricultural film at the bottom of the ditch. Water should be watered once while fertilizing. The second fertilization is carried out in the middle and late September, and the fertilization ditch should be dug on the other side of the planting row. In the future, the operation can be rotated every year.

2. Spraying fertilizer outside the root. After removing the film and shearing, combined with disease prevention and pest control, spray 1000 times liquid fruit tree special type "Tianda-2116" + 0.7% brown sugar + 0.3% urea solution every 7-15 days for 3-4 times in a row. After the end of June, 0.4% potassium dihydrogen phosphate solution + 0.7% brown sugar solution + 0.3% urea solution was used alternately, spraying once every 7-10 days for 3-4 times.

Third, spray paclobutrazol. From the beginning of July, 200-300 times liquid 15% paclobutrazol was sprayed every 10-15 days for 1-3 times in order to inhibit the growth of new shoots and promote flower bud differentiation.

Fourth, drainage and waterlogging prevention. Cherry trees are afraid of waterlogging. once the field is flooded, when the time is about 24 hours, the trees will die because of flooding. Therefore, after removing the film, it is still necessary to raise a high ridge, and the ridge surface is covered with plastic film to prevent waterlogging. When it rains, we should also pay attention to timely drainage, and it is strictly forbidden to accumulate water between rows in the shed.