Fertilization principle
In view of the neglect of organic fertilizer application and soil improvement and fertilization in citrus production, soil acidification is serious, the area of ​​infertile orchard is large, the amount of fertilizer used by farmers is large, the amount of fertilizer and ratio, fertilization period and method are unreasonable, calcium, magnesium, Boron, zinc, iron and other trace elements are common, soil erosion is serious, fertilizer utilization is low, etc., the following fertilization principles are proposed:
(1) Pay attention to the application of organic fertilizers, vigorously develop green manure in orchards, and implement straw cover in orchards;
(2) Orchard with severe acidification, apply appropriate amount of acidic soil conditioner such as silicon-calcium fertilizer or lime;
(3) According to the citrus varieties, orchard soil fertility status, optimize the amount of NPK fertilizer, the proportion of compound application and the fertilization period, and specifically supplement the trace elements such as calcium, magnesium, boron, zinc and iron;
(4) Fertilization method is changed to the whole garden for application as a concentrated point or ditch;
(5) Combining fertilization with water management and high-yield and high-quality cultivation techniques, conditional orchards advocate the use of water and fertilizer integration technology.
2. Fertilization advice
(1) Orchard with an output of more than 3,000 kg per mu, organic fertilizer 2~4 square/mu, nitrogen fertilizer (N) 25~30 kg/mu, phosphate fertilizer (P2O5) 8~12 kg/mu, potash fertilizer (K2O) 20~30 kg /mu;
(2) Orchard with 1500~3000 kg per mu, organic fertilizer 2~4 square/mu, nitrogen fertilizer (N) 20~25 kg/mu, phosphate fertilizer (P2O5) 8~10 kg/mu, potash fertilizer (K2O) 15~25 Kg/mu;
(3) Orchard with an output of 1500 kg or less, organic fertilizer 2~3 square/mu, nitrogen fertilizer (N) 15~20 kg/mu, phosphate fertilizer (P2O5) 6~8 kg/mu, potash fertilizer (K2O) 10~20 kg /mu.
For the orchard lacking calcium and magnesium, calcium magnesium phosphate is used. For orchards lacking boron, zinc and iron, 0.5~0.75 kg of borax, 1~1.5 kg of zinc sulfate and 2~3 kg of ferrous sulfate per mu, mixed with organic fertilizer and applied in autumn; orchard with pH<5.5 The application of silicon-calcium fertilizer or lime is 60-80 kg, 50% in autumn, and 50% in summer.
Spring fertilization (germination or pre-flowering fertilizer): 30%~40% nitrogen fertilizer, 30%~40% phosphate fertilizer, 20%~30% potash fertilizer applied before germination in February and March; summer fertilization (strong fruit fertilizer): 30%~40% nitrogen fertilizer, 20%~30% phosphate fertilizer, 40%~50% potash fertilizer applied in June~July; autumn and winter fertilization (seeking fruit fertilizer): 20%~30% nitrogen fertilizer, 40%~50 % of phosphate fertilizer, 20%~30% of potash, all organic fertilizer and boron, zinc fertilizer and iron fertilizer are applied before and after fruit picking from November to December.
This article URL: 2016/2017 autumn and winter citrus scientific fertilization guidance citrus fertilization skills
Radial Artery Compression Tourniquets
Radial Artery Compression Tourniquets,tourniquet oem,medical tourniquets,tourniquet pneumatic
Anesthesia Medical Co., Ltd. , https://www.jssinoanesthesias.com