Cultivation Techniques of Navel Orange Variety--Late Navel Orange

1. Adaptability and cultivation suitable area: adaptability is wide, navel orange can be planted in China, but the yield is low or unstable after planting. two。 Key points of cultivation techniques and matters needing attention: (1) suitable rootstock and reasonable planting: in acidic and neutral soil, Fructus Aurantii rootstock can be used; but in alkaline, red orange or Ziyang orange should be used as rootstock. Strong seedlings are planted with a height of more than 60 cm, a stem diameter of more than 0.8 cm and 3 or more branches. The planting density is generally 3 meters between plants and 4 meters between rows, that is, 56 plants per mu. (2) increase the application of fertilizer: mainly organic fertilizer, supplemented by chemical fertilizer. In the first, second and third years after planting, young trees are mainly promoted to shoot in spring, summer and autumn, and should be applied frequently, mainly nitrogen. In the early stage of the result, the amount of fertilizer application should be increased and the times of fertilization should be reduced. Timely irrigation: flowering and young fruit stage are very sensitive to high temperature and drought, lack of water will cause a large number of young fruit shedding. (3) to protect flowers and fruits and promote a good harvest: before the first physiological fruit drop, the fruit was coated with 200 mg / L cytokinin and 100 mg / L gibberellin, or the whole plant was sprayed with 50 mg / L gibberellin solution; before the second physiological fruit drop, the foliar spray was made with E T2 solution with a concentration of 24 mg / L. (4) shaping and pruning to prevent and control diseases and insect pests: in the first and second years of planting, the shaping of young trees is mainly to pick the heart and wipe buds, so that the tree becomes a natural round head. Trees entering the fruiting stage are pruned by means of thinning truncation and pruning. The pruning time is mainly in winter and supplemented by summer. In the prevention and control of diseases and insect pests, we should do a good job in the prevention and control of red spiders, aphids, butterflies, leaf moths, leaf rollers, leaf beetles, malignant leaf beetles, scale insects, rust wall lice, anthrax, foot rot, fat spot, and so on.