With the rapid development of cotton planting industry, mechanization has become the mainstream of cotton planting industry.Therefore, using the chemical products, such as cotton defoliant mechanized spraying is often used to control plant diseases and insect pests in the variety of ways.This paper will lead everybody know about the cotton defoliant used methods, time and attention points, details are as follows:
The correct way of using the cotton defoliant
1, because play defoliant work is so important, make sure you buy from formal channels, or by call professional defoliant mechanical services hand or unmanned aerial vehicle (uav) spray insecticide.
2, defoliant consists of three parts, the main medicine, thiamethoxam benzene, builder and ripening of ethephon.Different defoliant, have the use of different methods and matters needing attention, be sure to carefully read clearly.Must be patient, it is best to take three clean containers, secondary dilution beforehand, respectively, and full of these three things dissolve in water purification.Back then, one by one, in advance with two thirds of the water, the spray insecticide can fully stir well in the end.
3, if there is a surplus builder, can add some more.
4, defoliant diluent, must along with it, don't put on hold for the night
5, the use of spray.
6, the amount of defoliant used is calculated according to the number of mu, it is important to please think carefully, before to spray insecticide of cotton growing, hit the (uniform), how much per acre solution.To calculate a calculate, spray insecticide how block in order to avoid a heavy car should go or not hit.
7, unmanned aerial vehicle (uav) defoliant is completely feasible.Like mechanical spray insecticide, need to be more careful secondary dilution defoliant.And, according to the medicine can has a capacity of uavs, and dosage, to calculate how much a case of solution should play acres, again good computing speed, ensure no leakage, not heavy.
8, 7, 8 PM after spraying effect is good.
9, look at the direction of the wind, as far as possible not to affect the surrounding not harvest the crops.
After 10, spray insecticide, 12 hours in obvious rainfall, need to retype it.General defoliant, need to play two times.Carefully observe effect of defoliation.
Cotton defoliant optimal spraying time
The best cotton defoliant spraying time on September 5 after a few days ago.Because defoliant is more sensitive to temperature changes, after spraying with 10 day average temperature above 20 ℃, defoliation and boll opening speed is faster;After the drug 10 day average temperature below 18 ℃, defoliation and boll opening speed slow down obviously.
Cotton defoliant spraying pay attention to the point
1, according to the situation of cotton natural mature spraying
In order to ensure the cotton maturity, reduce cotton defoliant influence on cotton single boll weight and quality, should be in cotton boll opening nature has reached around 50%, mature bolls reached more than 90%, or subject to spraying cotton defoliant.
2, according to the weather forecast for spraying
Pay attention to the weather changes, before spraying defoliant relation with the temperature of the 6-10 days after applying pesticide most closely.Must ensure that the daily average temperature 10 days after spraying in 20 ℃ above, to ensure the quality of defoliation and boll opening effect, to facilitate mechanical harvest.Administer period, therefore, should choose before cooling temperature after picking up, try to avoid high temperature before cooling, administer.According to relevant data, high temperature period and applying pesticide medicine within 10 days after the temperature continues to decline, defoliation rate is low;Administer period within 10 days after the drug was low and temperatures rising defoliation rate is high;The temperature rising after fall first, after applying pesticide defoliation rate is low.
3, uniform spraying
Under the water must be over 450 kg per hectare, and the maximum guarantee each leaf can be sprayed to the solution.
4, to maintain certain soil temperature field
Ensures normal metabolism of cotton leaves, and the cotton leaves itself to be full of vitality, can be beneficial to the absorption of defoliant.As a result, the water must be properly time late some, machine pick cotton drip irrigation on August 30 or so stop pouring, conventional irrigation land should be in August 20 or so stop pouring.
