Technical advice on rice field chemical elimination

The field chemical removal of rice is the key link to realize the high and stable yield of rice. There are mainly three kinds of weeds in rice fields in our county: barnyardgrass, Euphorbia angustifolia and other grasses, broadleaf weeds such as Hedyotis diffusa, Eichhornia crassipes, Rabdosia rubescens, and Cyperaceae weeds. In recent years, due to the variety of rice planting methods in our county, great changes have taken place in the paddy field: first, some malignant weeds in the paddy field have a rising trend, except for the occurrence of barnyardgrass, there is an obvious upward trend; second, the harm of weeds in the middle and later stage of rice is aggravated, and there is an obvious second peak of weeding in the roasting field, with more broad-leaved weeds such as duck tongue grass, melon pericarp grass, strange cabbage and so on. Each township should take corresponding control measures according to different cultivation methods and field weeds, grasp the best suitable time for pesticide application, and do a good job in the control of weeds in paddy fields.

I. chemical removal of transplanting fields

1. Manual planting: after transplanting live trees for 5-7 days, combined application of back-green fertilizer and insecticidal to control Chilo suppressalis, 30 grams of 20% ethylbenzyl wettable powder per mu, and shallow water layer for 5-7 days after treatment.

two。 Machine planting: 3-5 days after machine insertion, 30% benzyl propylene wet powder 100 grams per mu of medicinal soil or fertilizer method, and water retention for 5-7 days.

3. Throwing seedling field: 3-7 days after throwing, combined with Shangshui to stand seedlings, apply 30% propylbenzyl wettable powder 100 grams or 30% butylbenzyl wettable powder 120-150 grams per mu, and retain water for 5-7 days. If you need supplementary treatment, you can spray 36% benzyl chloride wettable powder 50 grams per mu before and after the 3-leaf stage of barnyardgrass, water for 1-2 days and water retention for 3-5 days. Benzyl A mixture (2A 4 chlorine 110 ml + 48% Bentazone 100-150 ml / mu) can be sprayed with 30 kg of water to control residual sedge and broad-leaf grass.

Second, the direct broadcast field is removed

The technology of weed control in direct seeding rice field adopts the principle of "one letter, two killing and three supplements". "one letter" is pre-bud treatment, "second killing" is a supplement to pre-bud treatment, using stem and leaf treatment, and "three supplements" are based on the first two steps. according to the occurrence and types of weeds to decide whether to use medicine to control.

(1) after pre-seedling treatment of rice sowing and irrigation, about 2MUR for 3 days, when the board surface is above the water surface, there can be no stagnant water on the board surface, and can be sprayed with propyl benzyl herbicides such as 30% direct seeding 100-120 grams, etc. Keep water in the ditch and moist rice fields after the medicine, and open the flat water gap in time to avoid drug damage when flooding seedlings during heavy rain.

(2) the weeding effect in the early stage after seedling control is not ideal, and the fields with more weeds can be replaced at the seedling 3-leaf stage. In fields mixed with Gramineae, broadleaf grass and Cyperaceae weeds, the application time should be strictly controlled after 3 leaves and 1 heart of rice, and the stagnant water in the field should be drained at the same time, with 80-100 ml of 10% fazolamide EC (Han Qiuhao) per mu, 30-45 kg of water at the 5-leaf stage of weeds, evenly sprayed with a manual sprayer, irrigated for two days after application, and kept 3 cm water layer for more than 5 days, and then entered the normal management of the field. Or 2.5% Daojie (pentafluorosulfonamide county floating agent) 60 ml or dichlorobenzyl herbicides were sprayed evenly, rehydrated after 24 hours, and kept in shallow water layer for 3 days). Fields mixed with broad-leaved grass and Cyperaceae weeds can be treated with 20 grams of 10% picosulfuron or 20 grams of 10% benzosulfuron wettable powder per mu and sprinkled with fine soil or fertilizer to keep the shallow water layer for 3-5 days. With the mixed field of Qianjin and barnyardgrass, 10% gold 60-70ml spray can be used in the rice seedling 3-5 leaf stage (weed 4-5 leaf stage), drain the water before the medicine, return water every other day, and keep the shallow water layer for 3-5 days. Fields mixed with broad-leaved weeds can use 2.5% pentafluorosulfonamide oil suspension 40 ml per mu alone, or 20 grams of 10% benzyl sulfuron wettable powder per mu one week after application, with 30 kg of water spray.

(3) according to the effect of "Yifeng and Ershu", the main purpose of the supplementary treatment is to control the weeds of Hedyotis diffusa and Cyperaceae, which can be fertilized or sprinkled with 20 grams of 10% benzosulfuron wettable powder per mu, while perennial root malignant weeds propagated in perennial rhizomes are artificially removed.

Matters needing attention

1. The field should be flat, and the water layer must not submerge the heart leaves of rice to prevent drug damage; if the field is leaking, water should be replenished in time; the dosage should be accurate and the medicine should be evenly mixed; when mixing the medicinal soil (fertilizer), the powder must be mixed well with a small amount of fine soil, and then mixed in the fine soil or (fertilizer) to ensure that the soil or (fertilizer) is mixed evenly; according to the age of the grass in the field, the dosage should be increased or decreased appropriately.