There are many pathogens and pests that overwinter in the soil by deep-turned tree trays. During the dormant period, deep-turned tree trays can turn overwintering insects, cocoons and pupae in the soil to the ground and freeze to death, or turn deep into the soil to prevent them from being unearthed Harm.
Cleaning the orchard When the leaves of the pear orchard are almost finished, the fallen leaves and weeds must be cleaned up in time, bury them together or burn them, which can eliminate overwintering pests and increase the fertility of the pear orchard soil.
Pulling branches in autumn At this time, branching has the characteristics of easy pull, quick setting, good slowing effect and high flower formation rate.
Scraping the bark There are many overwintering pests in the pear bark cracks and warped bark, such as small pear heartworm, red spider, etc. Scraping the bark in winter can scrape out the insects and eggs hidden in the bark, and eliminate them in a concentrated way, reducing the number of next year Insect population density.
For pear orchards with heavy pests and diseases, spray 45% crystal lime sulfur mixture 100 times solution once after pear leaves fall to kill pests that have just entered the dormant period and reduce the occurrence of pests and diseases in the following spring.
Pruning pests and diseases combined with pear winter pruning, the branches with worm holes or eggs, dead branches, dead buds, and dead fruits are cut off and burned together.
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Chloride is a common inorganic anion in water and wastewater. Chloride ions are found in almost all natural water,and their levels vary widely. In rivers, lakes. In marshes, chloride levels are generally low,but in seawater,salt lakes,and some groundwater levels can be as high as tens of grams per liter. In the human survival activities,chloride has very important physiological functions and industrial uses.Because of this,a considerable amount of chloride ions are contained in domestic sewage and industrial wastewater.
If the content of chloride ion in the book reaches 250mg without litres,the corresponding cation is sodium,will feel salty; High levels of chloride in water can damage metal pipes and buildings and hinder plant growth.
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