Scientific fertilization. This year's navel orange seedlings can generally survive for half a month. After the survival needs, topdressing 65,438+0 effective fertilizer every half month, watering dilute manure or 0.5% urea, spraying 25 grams of urea on each tree, and loosening the disc to promote root absorption.
It is not advisable to apply quick-acting fertilizer after August to avoid late autumn buds. In the second year, topdressing was carried out three times, focusing on spring, summer and autumn. In early February, early May and late July, the dosage of urea per plant is 0.2 ~ 0.4 kg. After the autumn shoots mature, base fertilizer should be applied, and each plant should be applied with fencing fertilizer 1 0 ~ 20kg, calcium superphosphate 2kg and compound fertilizer1kg.
In the third year, the seedlings began to bear fruit, and phosphorus, potassium and organic fertilizer were applied to meet the needs of flower development.
At the same time, from April to early August, the surface treatment was carried out every 20 days or so, mainly using 0.2% potassium dihydrogen phosphate.
+0.3% urea +0.2% borax+zinc sulfate mixture or special micro-fertilizer. In early July, 2 kilograms of compound fertilizer was applied to plants and fruits, and fertilizer was applied in autumn. These trees are gradually cultivated and managed by traditional fertilization methods.
Reasonable shaping and pruning. When young trees are cultivated, they must be tree-shaped and cannot be pruned. Generally, sprouting, drying and pruning are used to promote multi-branches.
Specific operation method: in principle, in the first year, do not move the branch shears, but only cut off the diseased branches and dead branches;
In the second year, the trunk of seedlings is about 25 cm, and 3 ~ 4 main branches are cultivated in plastic bags above the trunk. Do a good job in reducing summer twice. The first time was in mid-May. I was familiar with the shortcut of about one third of the crown spring pin and advocated a healthy summer.
The second time was in mid-July, and I was familiar with the surrounding canopy. It is recommended to leave the roof on the 6th to 8th day in summer. Until mid-July, the Chamber of Commerce will always hang branches on branches. Dense crown and crazy half-length can be tied with rope to remove the bud in time.
In the third year, thinning flowers, thinning flowers and abnormal flowers were cut off, and some measures were taken to protect the fruit.
The yield per plant is generally controlled at about 5-8 kg, and the excess fruit should be removed.
Assist in management. After the seedlings were planted, rice stalks were covered on the tree tray in that year to protect the seedlings.
In winter, before the cold current comes, cover the branches of seedlings with big bags or straw, and brush the trunk with white paint.
Advocate intercropping leguminous crops or planting grass in orchards. Pest control and tree formation are basically the same. In the third year, corresponding measures should be taken to protect the fruit and ensure early harvest.