Since entering the volcanic zone, the frequent warming and moistening brought by northern air have led to a rapid invasion of harmful organisms such as the "two migrations" pests—rice planthoppers and leafhoppers. These pests tend to explode suddenly and are difficult to detect, and once they spread over large areas, they can cause severe damage to rice crops. To reduce the impact and ensure a stable increase in rice yield, the following special preventive measures are recommended:
First, apply 50–100 grams of garrison per mu, mixed with 30–40 ml of Jiarujin and 60 kg of water. This mixture helps to effectively control the early stages of pest infestation.
Second, use 400 ml of dichlorvos mixed with 150 kg of wet soil and spread it evenly across the field. The best time for application is between 9 am and 11 am, avoiding the hottest hours after 3 pm to prevent heat-related poisoning. It's also advised to keep flowers in the field during spraying, as this can improve the effectiveness of the treatment.
Third, continue with agricultural control methods such as draining and drying the fields to manage moisture levels in paddy fields. This creates an unfavorable microclimate for sheath blight and rice planthopper reproduction.
Fourth, implement targeted guidance rather than a one-size-fits-all approach. For fields with vigorous growth, dark green leaves, dense foliage, and heavy infestations, focus on these areas and treat them twice. For normally growing fields, keep the population of P. edodes around 500 individuals per square meter. For weak seedlings that show signs of nutrient deficiency, yellowing leaves, or delayed growth, delay treatment until mid-August and adjust the strategy accordingly, allowing up to 800 individuals before taking action.
These measures not only help protect the crop but also promote sustainable pest management practices. By combining chemical and cultural methods, farmers can better respond to the challenges posed by climate changes and pest outbreaks. Regular monitoring and timely intervention remain key to successful rice cultivation in this region.
The valve stem is an important part of the valve.
It is used to drive, connect the actuating mechanism or handle, and directly
drive the spool to move or rotate, so as to realize the function of valve switch
or regulation.Valve stem in the valve opening and closing process is not only
moving parts, stress components, but also seals. At the same time, it is
subjected to the impact and corrosion of the medium, and it also causes friction
with the packing. Therefore, in selecting the stem material, it must be
guaranteed that it has sufficient strength at the prescribed temperature, good
impact toughness, scratch resistance, corrosion resistance. The valve stem is a
vulnerable part, and the mechanical performance and heat treatment performance
of the material should be paid attention to when selecting.The valve stem in the
valve opening and closing process, under tension, compression and torsion force,
and direct contact with the media, as well as the relative motion between the
friction and filler, so in the choice of stem material, must ensure that it
provides adequate temperature strength, good impact toughness, abrasion
resistance and corrosion resistance of.
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