Core Tip: Recently, greenhouse vegetables usher in the change season, after experiencing a cycle of vegetable growth, the greenhouse will no longer be able to recuperate to meet the arrival of a new round of vegetable replacement. At this time, we said that management is critical, including both the greenhouse itself and the shed soil. Experienced growers will often make a full “physical examination†for the greenhouse at this time, to improve the soil, and even to cultivate the vegetables after harvest. Create a good growing environment.
â—† Greenhouse "should" not be sloppy
Loosening of steel wire, it is important to note that with the increase in the service life of the greenhouse, the gable soil on both sides is changed, and the steel wire fixed to the wall becomes loose (this occurs after the greenhouse is used for 3 to 5 years). Loosening will exacerbate the friction between the film and the shed film, form a hole in the shed film, and reduce the service life of the shed film. At this time, the refastening of the steel wire is required. The specific operation is to use the tying machine to fix the steel wire on both sides of the gable. Tightening, generally need to pull the wire out of 20 cm.
Sheds on bamboo sheds and sheds in front of the shed will be maintained and replaced in time. For sheds with a slightly longer service life, they will be subject to rain erosion and pressure loss. The compressive abilities of bamboo sheds and sheds on sheds will be weakened, causing danger to the production of sheds. Sex, therefore, the empty period is the best maintenance period. Supplement the damaged bamboo raft and fix it with iron wire to secure the shed and iron frame.
The back wall film non-woven fabric was updated to a protective back wall and covered with a film and a non-woven fabric. However, it was eroded by rain and snow. The film and non-woven fabric were seriously damaged, and the protective effect was greatly reduced. This is also a vegetable farmer. It is easy to ignore the place, so it is also changing with the slack.
â—† The old shed soil improved carefully selected fertilization
First of all, the base fertilizer should be mainly pure organic fertilizer. When selecting the organic fertilizer, the old shed should not use organic fertilizers with high salt content, such as fresh chicken manure and pig manure, but use organic fertilizer with low mineral element content. In livestock and poultry manure, sheep manure and cow manure have relatively higher content of organic matter and less salt, which is suitable for use as an old shed base fertilizer. Cakes have a higher content of organic matter and more comprehensive nutrition. They are also one of the fertilizers that can be selected, such as bean cakes and peanut cakes.
Secondly, Yuan Topdressing should use water-soluble fertilizers with high absorption and utilization. Although there is high nutrient content in old soil, many of them are fixed and cannot be absorbed and utilized. In the middle and late stages of vegetable growth, when the absorption of nutrients is large, if the fertilizer is not supplemented in time, it will still affect the yield of vegetables. Therefore, the selection of water-soluble fertilizers with high absorption efficiency and low residual content is an essential fertilizer for vegetable top-dressing. It is advisable to use high-intensity irrigation methods such as micro-spraying and drip irrigation in the old greenhouse, so that most of the nutrients put into the greenhouse can be absorbed and utilized to minimize the residual of mineral elements in the soil. With the same amount of fertilizers, the new water-soluble fertilizers have higher absorption and utilization and less residual.
Once again, Yuan gradually increases the amount of beneficial bacteria in the production of old shed vegetables. It is very important, on the one hand, to prevent the spread of soil-borne diseases through supplementation of beneficial bacteria, and on the other hand to increase the amount of bacteria used to promote the organic matter in the soil and be immobilized. The decomposition and transformation of mineral nutrients reduces the residual of mineral nutrients in the soil. At the same time, beneficial bacteria can also protect and promote root growth in harsh soil environments. The use of beneficial bacteria in old sheds is persistent and may not be effective in a short period of time. However, if we persist in using them for more than one year, the beneficial effects of beneficial bacteria will gradually become apparent.
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