Herbicide injury causes

( A ) atrazine

Atrazine known atrazine , at high temperatures , bases and inorganic acids which can be hydrolyzed to the free hydroxy derivative herbicidal activity . In maize, the allowable residues of 0.02 × 10-6. Commercially available preparations are 50% and 40% WP suspension concentrate . Atrazine is a selective preemergence within the suction type , postemergence herbicides used . Right corn can control annual grass weeds and broadleaf weeds, weeds for some years there is a certain extent. Corn premedication after sowing , the soil organic matter content of l% ~ 2% of the area per acre with 40% of plastic hanging from 175 to 200 ml , organic matter content of 3% to 5 %, and more areas of weeds per acre with 40% colloidal suspension agent

200 to 250 ml , sandy soil with a lower limit , with a ceiling on clay , 1 to 3 days after sowing , add water to 30 kg with a sprayer to spray the soil surface . Corn postemergence treatment can be carried out in the four -leaf stage . Pre-treatment with the vaccine requirements essentially the same . The herbicide on beans and peach sensitive medication should strictly intended.

( 2 ) 2,4 - butylate

Pure product is colorless oily liquid , volatile , when alkali decomposition. EC formulation is 72% . The herbicide is selective herbicide absorption within the main control cereal crops Tanaka dicotyledonous weeds and some weed . Corn after emergence spraying 4-5 leaf stage ,garden pressure sprayers 45 to 90 gram per acre with water 15 to 75 grams of dried , spray weed foliage . If preemergence treatment, after sowing

3 to 5 days spraying is appropriate , the dosage of 50 to 100 per acre

Grams, add water l5 ~ 75 kg. Generally valid for three to six weeks , on a single , dicotyledonous weeds are valid. Cotton, soybeans and other crops against harmful when used to have a certain area of ​​separation.

Injury causes : too late spraying, application rate is too high or uneven spraying may produce injury.

Injury symptoms : soil treatment with herbicides , shoots bend, young roots grow upward , after the return to normal. With herbicides stems, leaves treatment, twisted stems , leaves narrow, sometimes wrinkled , heart -shaped leaves rolled into oxtail difficult draw , stem brittle, easily broken , the stem base was goose -like, easy to lodging .

Injury prevention and mitigation measures: use herbicides stems, leaves treated should not exceed 5-leaf stage ,pressure sprayers the dosage should not be more than 1080 g per hectare . Soil treatment with herbicide per hectare dosage should not exceed

2160 g . To ensure uniform spraying . Swallowed the medicine , immediately induce vomiting , gastric lavage, oral administration of 10 % ferrous sulfate , every 15 to 30 minutes 10 ml , serving a total of 3 to 5 times. Do not use warm water lavage to avoid promote absorption.