In recent years, many vegetable farmers have encountered serious problems after years of continuous planting. Issues such as seedling death, stunted growth, leaf yellowing, and malformed stems and leaves have become increasingly common. According to Qi Bo, a researcher at the provincial vegetable office, these problems are primarily caused by long-term overuse of chemical fertilizers, soil acidification, lack of essential trace elements, severe soil-borne diseases, increased pesticide residues, and higher nitrate levels in vegetables. Additionally, secondary salinization under specific greenhouse conditions has significantly worsened the agricultural ecosystem, leading to continuous cropping obstacles.
To address these challenges, a comprehensive approach is necessary. First, adopting scientific fertilization methods is crucial. Farmers should combine base fertilizer with top dressing, applying the base fertilizer deeply and using layered or furrow application techniques. Top dressing should be done in conjunction with watering, and foliar fertilizer application should be promoted for better nutrient absorption.
Promoting the use of organic fertilizers is also key. High-quality, fully decomposed livestock and poultry manure should be utilized, ensuring proper composting and fermentation. Combining organic and inorganic fertilizers can help balance nutrient release—while inorganic fertilizers provide quick nutrients, they require frequent applications, whereas organic fertilizers offer slow, steady nutrient supply for long-term crop needs.
Improving irrigation and drainage systems is another important step. Deep trenches should be dug between greenhouses to lower the groundwater level. During the hot months of June to September, removing plastic films allows rainwater to leach salts from the soil, reducing its salinity. Replacing traditional irrigation methods with drip irrigation can further enhance water efficiency and reduce salt accumulation.
Implementing rational crop rotation can also help manage soil salinity. In late summer, planting cucumbers, peppers, or tomatoes after corn (without additional fertilizers) can help lower soil salt content. Growing Sudan grass is another effective method for salt removal.
Additionally, selecting disease-resistant grafted seedlings can help prevent pests and diseases. Improving the overall planting environment, such as through paddy-wheel rotation, and varying the types of vegetables grown can further reduce the risk of disease outbreaks and promote healthier crops. These combined strategies are essential for sustainable greenhouse vegetable production.
Automobile Chassis Parts
This classification mainly includes the aluminum alloy die casting Chassis 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: Machinery Parts
Certificate: IATF16949:2016,ISO14001:2015,ISO45001:2018
Lead Time: 30-35 days
Trade Term: FOB Ningbo
Automobile Chassis Casting Parts,Automobile Chassis Die Casting Parts,Automobile Chassis Parts
NINGBO ZHENHAI BOLANG METAL PRODUCTS FACTORY , https://www.casting-part.com