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Heavy damage is a irreplaceable alternative
When interviewed by reporters in various places, vegetable farmers generally showed that the yield and quality brought about by vegetable weighting decreased more and more prominent, among which melons, balsam pears and other melons were the most serious, followed by tomatoes and peppers. However, in many regions, vegetable production has become regionalized and specialized in the market. From the perspective of production and sales, many vegetable growers are still planting crops year after year. The reporter went to Jujia Village, an ancient city street in Shouguang, said vegetable grower Zhu Zhilong: “The growth of cherry tomatoes is relatively weak, but the stalks can grow to the thickness of the thumb when planted in previous years. It is now possible to weigh heavily. Cherry vine stalks are weak, and most of them are only the thickness of the little finger, and the yield is also obvious. Lower.†The growers who grow melons are even more aware of the fact that the new muskmelon grows exceptionally well, with fewer diseases and high yields, while the yield and quality of the muskmelon are greatly reduced after heavy muskmelon production. In order to alleviate the harm caused by heavy crops, vegetable farmers have used high-temperature stuffy sheds, methyl bromide smoke sheds, lime nitrogen treatment, organic fertilizers, biological fertilizers, etc. It is difficult to fundamentally solve the problem of strangulation from one aspect. It is difficult to fundamentally solve the problem of strangulation. For example, high-temperature stuffy sheds, methyl bromide smoke sheds, and lime nitrogen treatment soil just eliminate the pathogens in the soil. Rational fertilization can only maintain balanced soil nutrients. The harm of toxic substances is difficult to solve. Therefore, there is an irreplaceable role in the cultivation of greenhouse vegetables. Rotation is beneficial to both pest control and fertility. Rotation can make use of the nutrient elements in the soil in a balanced way and combine land use with land conservation. Secondly, it can change the ecological conditions of the farmland, promote microbial activity that can antagonize pathogens in the soil, inhibit the growth of pathogens, and improve soil physical and chemical properties; Exemption and reduction of some of the pests and diseases that are significantly more severe after the replantation of insect pests can lead to the death of a large number of insects with strong parasitic, single host plant species, and limited migratory capacity; IV. The elimination of self-toxicity problems after the replacement of vegetable varieties, and promotion The decomposition of self-toxic substances. In practice, many vegetable farmers have come to realize the importance of crop rotation and began to rationalize arrangements and carry out crop rotations. With reference to local market conditions, planting different types of vegetables, such as rotations between solanes, beans, melons, or rotations between vegetables and grain crops, can achieve very good results. Some time ago, when the reporter visited the town of Anqiu Jinzizi, he discovered that local farmers were harvesting melons in the spring shed, and the autumn worms were planted with corn to avoid long-term replanting. In some places, the establishment of a mobile shed can better complete the rotation. The village committee can guide farmers through rotation by helping to solve market sales problems.