Chemical weeding technology in paddy fields and dryland

Reasonable use of chemical herbicides to control weeds in paddy fields, dry land, or orchards has the advantages of low investment, quick effect, and labor saving.

1. Rice transplanting field, throwing field chemical weeding

The main focus of rice transplanting and throwing field control is the weeds in the first grassy peak. The commonly used herbicides are the compounding agents of acaricide and bensulfuron-methyl or pyrazosulfuron. mix two types of herbicides used to expand the spectrum herbicide. Commonly used acaricides are butachlor, herbicide, quinclorac, He Da Zhuang, Ai cut and so on. The safety requirements of herbicides are high in throwing fields, and special attention should be paid when selecting herbicides. For safety reasons, containing acetochlor, metolachlor, a herbicide metsulfuron limited to Southern China transplanted field use, do not use the northern rice.

　　 1. Selection of medicaments: prevention of annual and perennial singles in rice fields, dicotyledonous weeds such as valerian, cattle felt, ragweed, kohlrabi, tilapia, dwarf sage, squash, sedge weed, etc. It can be used as a one-time herbicide for rice fields such as butachlor, herbicide, quinclorac, Heda Zhuang, Ai, Tiancao, Caoke and Miquan.

　　 2 , use: 1 use 20% iso-benzyl wet powder commercial volume 25 ~ 30 g / acre, or

　　 14% B • Benzyl wettable powder volume 40 ~ 50 g / acre, or 25% B • Benzyl • A (Jingke Cao Xing) wet powder commercial volume 20 ~ 25 g / acre, after transplanting 3 ~ 7 In the day, mix 10 kg of wet fine soil and spread it evenly. Keep 3 to 5 cm of shallow water layer when applying, and keep water for 5 to 7 days after medicine . Note that it is limited to the use of transplanted fields in the southern rice area.

② Selection 37.5% butyl benzyl wettable commercial quantities • 80 to 135 g / acre, or 10% of the selected dose butachlor particulate product 500 to 600 g / acre 10% bensulfuron methyl wettable powder (10% or bensulfuron wettable powder) goods an amount of 10 to 15 g / acre, within 3 to 7 days after transplanting wet mixed with 10 to 15 kg of fine soil uniformly applicator. Keep 3 to 5 cm of shallow water layer when applying, and keep water for 5 to 7 days after medicine .

③ Selection • dichloro-benzyl 35% wettable powder product amount 30 to 50 g / acre, or 50% of selected goods dichloroquinoline wettable amount of the acid 25 to 30 g / acre with 10% wettable powder product bensulfuron The amount is 10 ~ 15 g / mu, and it is sprayed with water 5 to 7 days after throwing (planting) . Drain the field water before applying the medicine, and pour 3 to 5 cm of shallow water layer 1 to 2 days after the medicine , and keep the water for 5 to 7 days.

4Select 18.2% of the grass, the absolute quantity of 30 grams / acre or 20% of the grass volume of 30 grams / acre or 26% of the total commercial volume of 40 grams / acre, first add fine sand, coal ash or flushed soil 500 grams mix well Then mix well with fine sand or urea 5 ~ 10 kg, and evenly spread 5 to 7 days after rice transplanting . When applying the medicine, keep 1 inch of water layer in the field for 5 to 6 days, so that the rice fields do not enter the water, no water, and do not cultivate after application.

　　 3 , Note: 1 or more herbicides are specially used in paddy fields. It is strictly forbidden to be used in dry land or other paddy fields to avoid phytotoxicity; 2 It is suitable for transplanting fields with large seedlings over 30 days old , and it is not suitable for small seedlings to be planted; After the medicine, the water depth cannot submerge the rice heart; 4 the water leakage field is forbidden; 5 strictly according to the instruction manual, the dosage should not be increased arbitrarily, the field surface should be flat, and the water can not be dehydrated.

It is too early.

2. Chemical weeding in dry land

　　 1. Selection of medicinal products: control of orchards, mulberry gardens, tea gardens and dry cropland rotation fields ( such as corn (2428, -1.00, -0.04%) fields, flue-cured tobacco fields ) annual and perennial grasses weeds, broadleaf weeds such as horses Tang, foxtail, maiden, sorghum, white stalk, algae lotus seed, bermuda, piglet, etc., can choose 20% Hecai (paraquat), 41% first handle or 41% farmer or 41% paraquat Or 41% Roundup or 41% Ganquanchun or 41% Ganjing or 41% glyphosate and other herbicides.

　　 2 , use: in the vigorous growth period of weeds, use the water to dilute the drug evenly on the weed leaves and grass stems. Control the annual use of weeds in the amount of 100 ~ 150 ml, perennial weeds can be used in 150 ~ 200 ml of water 30 ~ 40 kg. (In the early autumn, late spring, summer, the amount of acre is 200ml , and the amount of acre in winter is 300ml .)

　　 3 , note: ( 1 ) the above agents are quenching herbicides, should avoid spraying the crops on the crops to produce phytotoxicity; ( 2 ) 7 to 10 days after the general application begins to work, do not mow, graze during this period ( 3 ) If it rains within 4 hours after spraying, it should be re-sprayed. When the weather is dry, increase the water consumption appropriately.