â‘ Variety selection: Spring cultivation should choose varieties with strong winter characteristics. Fine varieties such as Shanghai Green, February Man, March Man, Winter Evergreen, Special Dwarf Green, and Dwarf Jiqing.
â‘¡Site preparation and fertilization: Since the growth period of small rapeseed is relatively short, 1000kg of decomposed human excrement per mu is applied as base fertilizer one week before the cultivated land, and then the border surface is finely raked and leveled.
â‘¢Sowing: Sowing in time on the basis of a good ground, sowing evenly, shallowly rake the surface after sowing, and then steadfastly or pat. Water should be timely based on soil moisture.
â‘£Field management: Small rapeseed is generally topdressed 2-3 times, and topdressing urea is about 5kg per mu each time.
⑤Harvesting: Spring greenhouse planting is generally harvested 50-60 days after sowing, with a yield of about 1000 kg per mu.
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The production and quality of enzyme preparations produced by plants are unstable due to the influence of growth area, season, climate, etc. The enzymes produced by animals are mainly extracted from the glands of slaughtered livestock, and the source is limited; only enzymes produced by microorganisms can meet the needs of any scale, with high yield and stable quality. Microbial enzyme preparations can not only replace the main types of animal and plant enzyme preparations with the same performance, but also produce high-temperature-amylases that act as catalysts at 100°C and detergent proteases that act at pH 10-12. In the 1940s, the microbial enzyme preparation industry developed rapidly. At present, the production of enzyme preparations is mainly based on deep fermentation, supplemented by semi-solid fermentation, and the ability of the strains to produce enzymes has also been greatly improved. The immobilized enzyme and immobilized cell technology developed in the 1960s and 1970s enabled the enzyme to be used repeatedly and continuously reacted, and its scope of application was also expanded. At present, in addition to the food and textile industries, microbial enzyme preparations are also used in daily chemistry, chemicals, pharmaceuticals, feed, papermaking, building materials, biochemistry, clinical analysis and other aspects, becoming an important sector of the fermentation industry.
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