Skillful fertilization-- the principle of fertilizer use
The use of fertilizer must meet the needs of fruit trees for nutrient elements, maintain or increase soil fertility and soil microbial activity. The application of organic or inorganic (mineral) fertilizers should not have adverse consequences for the environment and fruit trees. To achieve three main, three combinations, that is: mainly organic fertilizer, supplemented by chemical fertilizer, the combination of organic fertilizer and chemical fertilizer; root topdressing, foliar fertilizer spraying as a supplement, topdressing and spraying fertilizer; a large number of elements, trace elements, a large number of and trace elements. Prohibited to use: urban garbage without harmless treatment by ① or garbage containing harmful substances such as metal, rubber, plastic and so on. ② nitrate nitrogen fertilizer, unspoiled human feces and unregistered fertilizers, etc.
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Effective control of Plutella xylostella with bacterial insecticides
Plutella xylostella appears all the year round, and bacterial insecticides are skillfully used to control Plutella xylostella. The control effect of bacterial insecticides is better for Lepidoptera pests such as Plutella xylostella. There are many kinds of bacterial insecticides, and the first high-efficiency Bt in China is Bacillus thuringiensis. The commonly used dosage is 8000 international units / ml per mu.
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Six kinds of fertilizers are not suitable for growing vegetables.
Seed fertilizer refers to fertilizer applied at the same time as sowing or mixed with seeds. The role of seed fertilizer is mainly to meet the nutrient needs of seedling roots, because fertilizer is near the seeds, seedling roots can quickly absorb nutrients. Planting fertilizer has a great effect on vegetable seeds, such as proper selection can ensure the smooth germination of vegetable seeds.
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