Zouping County is a major corn-producing region, with approximately 43,000 hectares dedicated to corn cultivation annually. Over 95% of the farmland uses chemical weeding techniques, which have proven to be low-input and high-efficiency methods. However, due to dry weather in recent years, high wheat stubble, and improper application by farmers, many areas have experienced poor weed control and herbicide damage. To address these issues, extensive field observations and experimental studies were conducted.
First, common application problems:
1. **Improper Selection of Herbicides**
Farmers often lack knowledge about herbicides and may choose products without understanding their specific effects on weeds. This leads to situations where corn seedlings are damaged or weeds remain uncontrolled. For example, 50% acetochlor EC is effective against grasses like crabgrass but performs poorly against ramie. Using the wrong herbicide can result in both crop injury and ineffective weed control.
2. **Incorrect Timing of Application**
Herbicides are most effective when applied at the right growth stage. Most grassy and broad-leaved weeds are vulnerable during the early bud stage. Applying herbicides too late, such as after the five-leaf stage of corn, can lead to phytotoxicity and reduced effectiveness. For instance, 40% acetochlor SC works well when applied before the three-leaf stage of corn, but if used later, it may cause leaf yellowing and stunted growth.
3. **Improper Application Methods**
Some farmers misuse herbicides by applying soil treatment agents as foliar sprays, leading to serious crop damage. Others may apply the wrong type of herbicide, such as using paraquat or glyphosate, which can harm both weeds and corn seedlings. Proper technique is essential for both safety and effectiveness.
4. **Incorrect Dosage**
Each herbicide has an optimal dosage that depends on soil type, crop stage, and weed density. For example, 40% isopropyl straw SE should be applied at 180–220 ml per mu in light loam soils. Too little reduces effectiveness, while too much can harm the corn plants. Farmers must follow recommended dosages carefully.
5. **Uneven Spraying and Insufficient Water**
Proper spraying requires even coverage and sufficient water to form a protective layer on the soil surface. Inadequate water or uneven application can leave gaps, allowing weeds to emerge. This is especially important when using soil treatment agents, as they rely on uniform distribution for maximum efficacy.
6. **Drift Damage**
Due to small plots and mixed cropping patterns, herbicide drift can damage neighboring crops such as cotton or vegetables. Using mobile sprayers without proper precautions can cause significant damage, especially on windy days.
7. **Weed Resistance and Species Shifts**
Prolonged use of the same herbicides can lead to resistance in certain weed species, causing shifts in the dominant weed population. This makes future weed control more challenging and requires careful selection of herbicides.
Second, key countermeasures:
1. **Enhance Technical Training**
Farmers should receive regular training on proper herbicide use to reduce errors and improve outcomes. Agricultural extension services play a crucial role in this process.
2. **Use Herbicides Correctly**
Understanding the differences between soil and foliar herbicides, as well as their modes of action (contact vs. systemic), is essential. Choosing the right product based on weed type, soil conditions, and crop growth stage ensures better results.
3. **Apply at the Right Time**
Soil treatment agents should be applied before corn reaches the three-leaf stage and before weeds germinate. Foliar treatments are best done after the five-leaf stage to avoid damaging young corn plants.
4. **Adjust Doses Based on Soil and Conditions**
Soil type affects herbicide performance. Sandy soils require lower doses, while clay soils may need higher amounts. Organic matter content also influences herbicide adsorption, so adjustments should be made accordingly.
5. **Improve Spraying Techniques**
Use adequate water (40–50 kg per mu) and ensure even coverage. Avoid over-spraying or under-spraying, and consider using manual sprayers instead of motorized ones to reduce drift and waste.
6. **Monitor Weather Conditions**
Spray after rain or irrigation when the soil is moist. Avoid spraying on windy days to prevent herbicide drift. Adjust nozzle direction to minimize contact with non-target crops.
In conclusion, while chemical weeding is widely used in Zouping County, many technical challenges remain. Addressing these issues through improved training, correct application, and careful monitoring will help maintain the efficiency and sustainability of this method.
Agricultural Bearings Case
This classification mainly includes the aluminum or zinc alloy die casting Bearings parts using in Agriculture area.
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
Die Casting Bearings Parts,Aluminum Die Casting Bearings Parts,Zinc Die Casting Bearings Parts
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