First, growing habits;

1, the growth, flowering and fruiting of Shatangju fruit trees are closely related to environmental conditions such as temperature, sunshine, moisture (humidity), soil, wind, altitude, topography and slope direction, and these conditions have the greatest influence on temperature. Even if the temperature difference is 0.5℃, sometimes there will be completely different results.

2. The growth and development of Shatangju need the temperature of 65438 02.5 ~ 37℃. The day and night temperatures of flower bud differentiation in autumn are about 20℃ and 65438 00℃, respectively, and the soil temperature of root growth is roughly the same as the ground temperature. If the temperature is too low, Shatangju will be frozen. When the sweet orange is at -4℃ and the satsuma orange is at -5℃, the branches and leaves will freeze. When the sweet orange is below -5℃ and the satsuma orange is below -6℃, the branches will be frostbitten. When the sweet orange is below -6.5℃ and the satsuma orange is below -9℃, the plants will freeze to death.

Second, planting technology;

1, dig a planting pit

Keep a certain distance, dig a planting pit 80 cm deep and wide, then press the green manure 50 cm deep and backfill the soil 40 cm high for planting; Ridge planting: 8 meters, 60-80㎝ wide and 40-60cm deep, with 2 ridges per grid (width 1.5m, center distance 4m, height 20-30cm). When planting, the roots of seedlings should be trimmed appropriately, placed in the center of the planting hole, stretched and righted, and the seedlings should be gently lifted upward while filling the soil, so that the roots are closely connected with the soil. Water the roots, make a 1m tree tray around the seedlings, and cover it with chaff.

2. Soil management

It is necessary to dig holes and solidify soil, prohibit planting tall plants such as corn and wheat in the garden, and do a good job in rational intercropping and intertillage weeding in the orchard.

3. Fertilizer and water management

(1) Fertilization principle: It is necessary to fully meet the demand of blood oranges for various nutrient elements, advocate more application of organic fertilizers, and rationally apply inorganic fertilizers and formula fertilizers. According to the results of leaf analysis, orchard soil analysis and blood orange phenology, fertilization is guided. (2) Fertilization methods: mainly soil fertilization and foliar fertilization. The methods of annular furrow application, strip furrow application, hole application and soil surface fertilization were adopted.

(3) Fertilization of young trees: apply less fertilizer, mainly nitrogen fertilizer, with phosphorus and potassium fertilizer, and apply fertilizer 5-6 times in spring, summer and autumn when bamboo shoots emerge, (March, May, June, July, September, 65438+February, and apply 0.4 kg ammonium bicarbonate or 0.2 kg urea to each plant each time. 1-3 young trees should be applied with pure nitrogen 100-400g every year, and the ratio of nitrogen, phosphorus and potassium is1.0: (0.4-0.5):1.0. Adult trees should be fertilized four times, that is, germination accelerating fertilizer, fruit protection fertilizer, fruit strengthening fertilizer and fruit picking fertilizer. Generally, the amount of fertilizer applied is 2-3 kg of chemical fertilizer and one load of manure. Fruit-keeping fertilizer 1-2 kg phosphorus and potassium fertilizer+1 kg chemical fertilizer; Strong fruit fertilizer 1-2 kg chemical fertilizer+1-2 kg phosphorus and potassium fertilizer; The fruit picking fertilizer (base fertilizer) is mainly organic fertilizer, and each plant is applied with 50- 100 kg organic fertilizer+1-2 kg chemical fertilizer.

(4) Moisture: Irrigation when soil is dry, and drainage when water accumulates.

(5) plastic trimming:

(1) adjust measures to local conditions, prune trees, properly raise and lower them, and ventilate and transmit light to achieve three-dimensional effect.

Plastic surgery. The trunk is 20-40cm high, and the trunk branches (3-4 branches) are scattered on the trunk. The branching angle of the main branch is 30-50 degrees, and 2-3 auxiliary main branches are left on each main branch. Generally, after the third main branch is formed, the central trunk of this kind is cut off and twisted to one side to form a fruiting branch group.

③ pruning. Young trees are mainly cut lightly. After selecting the extension branches of the class center and the main branches and the extension branches of the auxiliary main branches, moderate or even severe pruning is carried out, and the growth balance among the main branches is adjusted according to the pruning degree and the direction of cutting buds. In addition to properly thinning the over-dense branches, the inner branches and weaker branches in the middle and lower part of the crown should generally be retained.

Early fruiting period: continue to choose short cutting to deal with all levels of trunk elongation branches, wipe summer branches and promote strong autumn branches. In autumn, measures such as ring cutting, root cutting and water control are taken to promote the flowering of Wangshu.

Full-fruiting period: timely retract the fruiting branches, falling branches and declining branches, and cut off the shading branches, dead branches and pest branches.