Zouping County is a major corn-producing area, with over 43,000 hectares of land dedicated to corn cultivation annually. The adoption rate of chemical weed control technology in the region exceeds 95%. This method has been proven to be cost-effective and efficient for weed management. However, in recent years, due to dry weather conditions, high wheat stubble, and improper application by farmers, many areas have experienced poor results from chemical weeding, including herbicide damage. Based on extensive field observations and experimental studies, this article summarizes the key issues and proposes practical solutions.
First, common application problems:
1. **Incorrect Herbicide Selection**
Farmers often lack knowledge about different herbicides, leading them to choose unsuitable products. Some believe that any herbicide will work, resulting in corn seedling damage. For example, 50% acetochlor EC is effective against grasses like crabgrass but performs poorly against ramie. Using the same herbicide across different weed species can reduce effectiveness and lead to unnecessary overuse, which harms crops.
2. **Improper Timing of Application**
Herbicides are most effective when applied at specific growth stages. Applying them too late or too early can reduce efficacy or cause crop injury. For instance, 40% acetochlor SC works best before the three-leaf stage of corn and two-leaf stage of weeds. If applied after the five-leaf stage, it may cause yellowing or stunted growth.
3. **Inappropriate Dosing**
Each herbicide has an optimal dosage depending on soil type, crop stage, and weed density. For example, 40% isopropyl straw SE should be used at 180–220 ml per mu in light loam soils. Too little reduces effectiveness, while too much can harm corn plants.
4. **Poor Spraying Techniques**
Uneven spraying or insufficient water leads to ineffective coverage. Soil treatment agents must form a uniform layer on the soil surface to suppress weed germination. Inadequate spraying allows weeds to emerge uncontrolled.
5. **Drift Damage**
Due to small plots and varied planting patterns, herbicides can drift onto adjacent crops like cotton or vegetables, causing severe damage, especially under windy conditions.
6. **Weed Resistance and Shifts**
Prolonged use of the same herbicide can lead to shifts in weed species, making future control more difficult. Some weeds become resistant, reducing the long-term effectiveness of chemical methods.
Second, recommendations for improvement:
1. **Enhance Training and Education**
Farmers should receive proper training on herbicide use, including application timing, dosage, and safety measures. Agricultural departments should provide ongoing guidance to minimize risks.
2. **Use Herbicides Correctly**
Different herbicides have varying modes of action—some are soil-applied, others are foliar. Farmers must understand their properties, such as whether they are contact or systemic, and apply them accordingly.
3. **Apply at the Right Time**
Soil treatments should be applied before corn reaches the three-leaf stage and weeds are still small. Foliar sprays are best done after the five-leaf stage to avoid damaging young corn plants.
4. **Adjust Dosage According to Conditions**
Soil type and organic matter content affect herbicide performance. Sandy soils may require lower doses, while clay soils and high-organic-matter fields need higher amounts.
5. **Improve Spraying Methods**
Use enough water (about 40–50 kg per mu) and ensure even coverage. Avoid over-spraying and use directional nozzles to prevent herbicides from drifting onto non-target crops.
6. **Monitor Weather Conditions**
Spray after rain or irrigation when the soil is moist. Avoid windy days to prevent drift. Use low-pressure sprayers to reduce the risk of damage to sensitive crops.
In conclusion, while chemical weed control is widely used in corn farming, its success depends on proper technique and understanding. By improving farmer knowledge and practices, the efficiency and sustainability of this method can be significantly enhanced.
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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
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