One, dozen do not hit greatly small
Want namely when weeds grows certain period resumptive with medicine, if fireweed is lesser when with medicine, fireweed contacts the area decrescent of medical fluid, go against the death of fireweed, the clearest case rebounds namely or the result is bad.
But fireweed also does not pass big, cross old saying, fight a gender to increase, need increases an amount. Usually, fireweed is in 2 ～ 4 Xie Jishi uses drug best.
2, dozen do not hit closely rare
Is this word what meaning? Because one fraction fireweed just grew to begin to use drug in the ground,do not want, the consequence that such doing crosses a half moon to control namely, discover the fireweed in the ground is increasing, before comparing dozen of drug even much, is this to return a responsibility how?
If fireweed is too rare, medical fluid is hit on the ground for the most part, volatilize next, passed a few days, weeds grows slowly, be equal to hit drug a few days ago to do not have action completely, return so that hit afresh.
So, wait for fireweed to grow about the same, a bit secret case falls to make drug again, what say here is close, not be big.
3, dozen wet do not hit dry
Be what meaning last bits? It is to read the soil moisture content in the ground actually, the soil moisture content in the ground is bad, when weather is drier, do not make drug as far as possible.
For what? The drought in the ground, fireweed lacks water, to retain moisture, can let its pore shut, such word, medical fluid is hit, how much cannot also absorb, cause medical effect general, fireweed amaranthine circumstance.
So someone said, fireweed already 4 leaves of 2 ～ , and closer, at that time arid word, if I do not make drug, be to miss optimal period?
This problem often is encountered in actual production, 2 kinds of methods are solved, it is to irrigate water, 2 it is many dozens of water when making drug, increase water consumption, but overall medical fluid chroma cannot be reduced.
Note:
Add does not use muddy water when medical fluid, and had better use attenuant method 2 times, make medical drop dispersive and even.
Atomizer pulverization wants measurable, droplet is too big, face of blade distributings exhibiting bad, and boil easily fall; droplet is too small, evaporate effect is apparent, medical effect loss.
Escape dew did not use drug before Gan Heyu.
Affect the external cause of herbicide drug effect
Agrotype: Include edaphic composition, soda acid sex. Organic qualitative content is higher in soil, drug adsorption must be jumped over much, differ accordingly soil, the dosage of use herbicide is different also, soda acid sex of soil is right to the stability of herbicide and plant the sensitivity of drug is influential.
Edaphic humidity: It is bigger also to the influence of medical effect, if easy play of effect of damp condition drug is being compared Ma Jin on the west, it is good to if soil is dry,use the effect that draw demand.
Air temperature: Infiltration of drug of air temperature influence and conduct speed, affect medical effect thereby, average air temperature is better in effect of use herbicide of 20 ℃ above.
Air humidity: The air when using drug is dry, fireweed stoma is shut, medical effect is small, vice versa.
Soil is microbial: Use onefold herbicide for a long time, what this kind of drug decomposes in soil is microbial increase, shorten thereby incomplete effect period.
