In recent years, many vegetable farmers have reported a growing problem: after years of continuous planting, seedlings are dying, showing stunted growth, leaves are wilting or deformed, and stems are malformed. This has become increasingly severe over time. Qi Bo, a researcher from the provincial vegetable office, explained that this issue is mainly due to the long-term use of chemical fertilizers, soil acidification, deficiency of trace elements, serious soil-borne diseases, increased pesticide residues, and higher nitrate levels in vegetables. Additionally, secondary salinization under specific conditions inside greenhouses has led to a deterioration of the agricultural ecosystem. To address these challenges, comprehensive measures must be taken to prevent and control continuous cropping obstacles.
One key solution is to apply scientific fertilization methods. Farmers should combine base fertilizer with top dressing. The base fertilizer should be applied deeply, using layered or furrow application techniques. For top dressing, it's important to combine it with watering and promote the use of foliar fertilizers to improve nutrient absorption.
Another important step is to increase the use of organic fertilizers. High-quality, fully decomposed livestock and poultry manure should be utilized, and proper fermentation is essential before application. Combining organic and inorganic fertilizers can help maintain soil fertility. Inorganic fertilizers provide quick nutrient release but require multiple applications, while organic fertilizers offer slow and steady nutrient supply, meeting the long-term needs of crops.
Improving irrigation and drainage systems is also crucial. Deep trenches should be dug between greenhouses to lower the groundwater level. During the hot months of June to September, removing plastic film allows rainwater to leach salts from the soil, reducing its salinity. Replacing traditional irrigation methods with drip irrigation can further improve water efficiency and reduce salt buildup.
Crop rotation is another effective strategy for salt removal. In late summer, planting cucumbers, peppers, or tomatoes after corn—without additional fertilizer—can help reduce soil salt content. Growing Sudan grass is also beneficial as it helps absorb excess salts from the soil.
In addition, selecting disease-resistant grafted seedlings can significantly reduce pest and disease outbreaks. Improving the overall planting environment and practicing crop rotation, such as paddy-wheel rotation, can help change vegetable types and prevent the spread of pests and diseases. These integrated approaches are essential for sustainable greenhouse vegetable production.
Transmission Parts
This classification mainly includes the aluminum alloy die casting transmission parts using in Auto area,the raw material is aluminum alloy.
In the die casting process,higher specific pressure is required, so that higher filling speed can be obtained.which is beneficial for alloy to overcome mold filling resistance.and effectively fill each part of the cavity.The Casting General Tolerance is Grade GB-CT4.
Process Technology: High pressure die casting, Cold Chamber
Product Dimensions: Customized
Casting General Tolerance: Grade GB-CT4
Flow Processes: Die casting, Degating to remove the residual of the gate, Polishing and Deburring to remove the burrs, Polishing to remove the parting line, flash,CNC Turning, Cleaning, Packaging, Storaging, Shipping
Control Measure: Incoming Material Test, First Article inspection, Routing inspection, Final item inspection, and Outgoing quality control
Inspection Equipment: CMM, Caliper, Plug Gage, Screw Gauge
Application: Auto Parts
Certificate: IATF16949:2016,ISO14001:2015,ISO45001:2018
Lead Time: 30-35 days
Trade Term: FOB Ningbo
Aluminum Transmission Parts,Die Casting Transmission Parts,Auto Transmission Parts,Malaysia Casting Transmission Parts
NINGBO ZHENHAI BOLANG METAL PRODUCTS FACTORY , https://www.casting-part.com