Green food production must be approached from an ecosystem perspective, considering crops, pests, weeds, and the entire agroecosystem. It is essential to implement integrated pest and weed management strategies that create unfavorable conditions for pests and weeds while promoting the growth of natural enemies. This helps maintain ecological balance and biodiversity within agricultural systems, reducing damage caused by harmful organisms.
The primary focus should be on agricultural practices such as selecting pest-resistant crop varieties, using non-chemical seed treatments, cultivating healthy seedlings, and implementing proper field management techniques like weeding, fall plowing, and clean cultivation. Crop rotation and intercropping also play a key role in managing pests and weeds effectively. Additionally, measures like light trapping, mechanical pest removal, and manual weeding can be used to control infestations without chemical intervention.
In cases where pesticide use is unavoidable, strict guidelines must be followed. For AA-grade green foods, certain approved pesticides are allowed, including those with moderate toxicity, biological agents, and natural enemies. Pheromone traps, plant-based attractants, mineral oils, sulfur-based products, copper compounds, and limited use of microbial pesticides are permitted.
However, synthetic chemical insecticides, acaricides, fungicides, herbicides, and plant growth regulators are strictly prohibited. The use of genetically modified organisms or products is also banned. Similarly, biogenic and mineral-based formulations containing synthetic chemicals are not allowed.
For A-grade green food production, the use of AA-class and A-grade approved pesticides is permitted. Plant-derived, animal-based, and microbial-based pesticides with moderate toxicity are allowed, along with sulfur and copper-based mineral pesticides. Some low-toxicity and moderately toxic synthetic pesticides may be used under strict national regulations.
Highly toxic, carcinogenic, teratogenic, mutagenic, or high-residue pesticides are completely prohibited. Only one application of each organic synthetic pesticide is allowed per growing season, and all usage must comply with maximum residue limits set by national standards. The use of highly toxic or persistent pesticides during storage is strictly forbidden. Again, genetically modified materials and preparations are not allowed in A-grade green food production.
Blind Flanges are manufactured without a bore and used to blank off the ends of piping, Valves and pressure vessel openings.
From the standpoint of internal pressure and bolt loading, blind flanges, particularly in the larger sizes, are the most highly stressed flange types.
However, most of these stresses are bending types near the center, and since there is no standard inside diameter, these flanges are suitable for higher pressure temperature applications.
Blind Flange,Blank Flange,Blind Plate,Pipe Blind Flange
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