Poor pre-emergence closure
The current preemergence herbicides for corn are represented by B and C, but the effect is not ideal in applications and has become obsolete in most areas. The reasons can be summarized as follows:
First, weeding effects are related to the climate. Drought climate, unrest, and insufficient water spray by most farmers directly affect the effectiveness of the closure.
Second, it is difficult to form a closed membrane due to the high-grain wheat bran and thick wheat bran, which affects the sealing effect.
Third, the use of hard-enclosed herbicides for many years has caused a fundamental change in the structure of weeds and weeds. Some severe weeds such as Cyperus rotundus have suffered from severe rooting weeds and self-producing wheat seedlings. Closed herbicides have no effect on them. .
Post-emergence weeding problems highlighted
The postemergence herbicides in corn fields are represented by nicosulfuron, nicotinamide, and nitrazine. There are also some problems that cannot be ignored, and there are gradually declining trends, mainly in three aspects:
The first is effective at killing the grass while the sealing effect is poor. After the fight, there are some small grasses growing out. Second, the market competition is fierce. Some manufacturers have quality problems in order to reduce costs, resulting in poor weeding effect and sometimes The occurrence of phytotoxicity; Third, the price is extremely confusing, lack of promotion power at all levels of dealers, as well as individual dealers in order to seek profits, purchase from improper channels.
Killing double effect worth the wait
There are four main types of formulations that truly have the dual roles of stem and leaf treatment and closure:
Nicosulfuron + Propisochlor / Acetochlor / Butachlor + Atrazine
This formula is more common, such as 2% Nicotinamide + 20% Propoxychlor + 20% Atrazine, 200 g / acre, but more prone to phytotoxicity, especially the formula of Nicosulfuron + Acetylene; the safest The formulation of nicosulfuron + Dingyi was followed by nicosulfuron + isoproterenol.
A good ratio at home is 2% Nicosulfuron + 10% Butachlor + 20% Atrazine, 70g/Mu; 2.5% Nicosulfuron + 20% Propisochlor + 30% To Tsu, 150 g/mu.
This formula is functionally positioned in the post-emergence mode. It can effectively control the weeds and common grasses such as glutinous rice dumplings, burdock, chicory, valerian, foxtail, goosegrass, cockroach, and scorpion. Leaf weeds also have excellent sealing effect. .
Mesotrione + (sperm)metolachlor / isopropylate / acetochlor / butachlor + atrazine
The safety of the formula was metsulfuron, sulfamethoxine, sulfamethoxine, nitric oxide, and the herbicide. Syngenta's product formula is 3% mesotrione + 24.7% metolachlor + 10.8% atrazine, 150 ~ 200 g / acre. The better formula for metsulfuron is 3.5% mesotrione + 15% isopropyl pyridine + 15% atrazine, 200 g/mu.
The function of this type of formula is to prevent large-leaved broad-leaved weeds after seedlings, especially for the malignant broad-leaved weeds, to eliminate some grasses and weeds, and to have excellent sealing effect. For hybrid corn, sweet corn, sticky corn, Burst corn is safer.
Oxacimone + (sperm)metolachlor/isopropylate/acetochlor/butachlor + atrazine
This formulation has a slightly better control effect against grass weeds than the formulation containing mesotrione. It has excellent control effects on retro-branch, ramie, alfalfa, goosegrass and glutinous rice dumplings, and it is effective against crabgrass, purslane, etc. The prevention effect is good, and the closed time is long. The disadvantage is that it is basically ineffective for the aconite root and the grass has the phenomenon of turning green.
Isofazoxazone + (sper) Metolachlor/Isopropylate/Acetochlor/Butachlor + Atrazine
This formulation can effectively control broad-leafed and grassy weeds. Isofazoxanone has a "recharge effect". After application, it can be reactivated by rain and killed twice. This formula has a longer duration of up to 4 months, which is unmatched by other herbicides.
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