Vegetable greenhouse is an excellent thermal insulation properties of the PC structure frame , so it appears that people can eat in-season vegetables. Usually vegetable greenhouses using steel skeleton , the top covered with a layer or multi-layer insulation PC , thus forming a greenhouse space. Drain well to prevent the outer membrane of the internal growth of vegetables produced by carbon dioxide , so the studio has good insulation effect .
Adjust vegetable production season, Promote high yield and quality of vegetables, it is one of the effective means to increase revenue. Commercial vegetable greenhouse from most people, the benefits are obvious. But some greenhouse vegetable cultivation, the effect is unsatisfactory, in addition to vegetable varieties wrong way, the "four evils" of the constraints is often an important factor in the loss. Such as:
The product is actually harmful salts, mainly due to the partial excess chemical fertilizers or fertilizing the soil salinization generated. Problems arising after fertilizer damage occurs, first suppressed vegetable root development, weaken the water, fat absorption function; The second is the soil solution concentration is too large, the occurrence of reverse osmosis vegetable strains body, leading to physiological wilting or scorched leaf margins; Third it is marching toxic gas hazards; Fourth initiator vegetables element deficiencies.
There is explicit phytotoxicity symptoms. There are hidden injury, symptoms of latent or deferred JC vegetable. Causes injury, first choice of pesticides wrong way or a misuse of herbicides; The second is the concentration of pesticide is too large; Third is to purchase and use a low-quality pesticides; Four is not enough to avoid the hot season spraying. After the injury occurred, and some vegetables blade quickly chlorosis; Some produce burns, perforation; some leaves, flower, fruit drop or deformity; The most serious whole withered.
●The drought victims.
There is explicit phytotoxicity symptoms. There are hidden injury, symptoms of latent or deferred vegetable. Causes injury, first choice of pesticides wrong way or a misuse of herbicides; The second is the concentration of pesticide is too large; Third is to purchase and use a low-quality pesticides; Four is not enough to avoid the hot season spraying. Causes, one vegetable greenhouses inappropriate siting, local lack of water; Second, although the water, but poor water quality; the third is the amount of water than the foot, ditch, drainage, irrigation and drainage facilities are not complete, water is difficult to lead. Drought damage affecting both vegetable sowing seedlings security, but also affect the norma growth of vegetables, and vegetable fertilizer to fight drugs and other management has brought great difficulties.
●Even stubble obstacles.
It is in the same category or the same kinds of vegetables, while the yield and product quality is declining. Cause disorder, one is similar or the same kind of vegetables you prefer a certain nutrients, such elements is not timely supplement prone element deficiencies; the other is due to the accumulation of soil diseases caused by pathogens cause, such as Fusarium wilt, Wilt etc.
Therefore, in order to make plastic greenhouses to produce more high-quality vegetables, in the selection and production studio site, the lessons learned should take effective measures in a timely manner.
First of all, to choose the right tent site, and improve water system facilities.
Before determining greenhouse, shed site to examine whether there is sufficient water, the water has not been contaminated? With sufficient water, be sure to make a good ditch, drainage, easy water drainage. Wherever conditions permit, every seat greenhouses should install a water faucet. High standard should be disposed of irrigation facilities.
Second, balanced fertilization, promote healthy growth of vegetables.
(1). It must be administered year-round full maturity of organic manure;
(2). To be administered refined organic fertilizer, organic fertilizer high energy;
(3). To change the bias applied to reduce nitrogen and phosphorus as nitrogen, phosphorus stability, increased potassium, Fertilizers fertilizer;
(4). To Graded amount of fertilizer;
(5). Day fertilizer damage appears to be more active spraying liquid fertilizer to alleviate hazards.
Third, we must adjust the rotation vegetable cultivation environment.
(1). Eggplant, tomatoes, melons, vegetables susceptible to yearly or quarterly replacement planting other varieties of vegetables;
(2). Prone to disorder again and again to shed organic fertilizer, soil improvement; the third is the choice of soil cropping agent, inhibit bacteria;
(3). For the soil nutrient deficiency, replenish the missing nutrients.
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