Which green rice herbicides can be used?

Preliminary study on reducing herbicide use in green rice. Yifeng county agricultural technology extension center plant protection station. Tanshan town agricultural technology station no.3. Yifeng 336300, Agricultural Technology Station, Shishi Town, Yifeng County, Jiangxi Province) Abstract: The control effect of rice bran on weeds in rice fields was studied. The results showed that the control effect of rice bran increased with the increase of dosage. The control effect of rice bran alone is much lower than that of conventional chemical weeding, and the highest is 82. 1%. However, the control effect of rice bran with 200g/m chemical herbicide is equivalent to or slightly better than that of conventional chemical weeding. The highest yield loss was 3.93%, but the highest yield loss of rice bran was 6.4%( 100g/m2), and the rest was 4.5. As early as 2004, Yifeng County established the long-term goal of creating an ecological county and a large green agriculture county, and successively compiled the Report on the Development Plan of Green Food Industry in Yifeng County and the five-year plan for the construction of the green agriculture demonstration zone in 2006-20 10. In order to meet the needs of green rice production and the development direction of green plant protection, in 2007, we conducted a preliminary exploration and experiment on the application technology of chemical herbicide reduction in green rice production. The test results are briefly introduced as follows. 1. Experimental objective Through experiments, the control effect and yield impact of rice bran on weeds in rice fields were understood, and the supporting application technology of chemical herbicide reduction was studied, so as to provide scientific basis for the screening and determination of alternative varieties of chemical herbicides and supporting application technology in green rice production, as well as large-scale demonstration and application promotion. 2. Experimental conditions 2. 1 Crops and target crops are two-late rice, the variety is Fengyuanyou 299, and the target is paddy weeds. 2.2 The experimental field for environmental conditions has 2 hills with an area of 4.2 mu, which is contracted by Tengqiao Village, Tianbao Township, Yifeng County, and even the Central Plains. It belongs to the core demonstration area of green rice and the weed-prone area of rice field. On July 22, 2007, the cultivation conditions such as planting, fertilizer and water management were basically the same. 3. The experimental design and arrangement are 3. 1 chemicals, 3. 1 test chemicals and treatment dose. The grain size of rice chaff is 30. Tianbao Tengqiao Rice Processing Factory produces 35% butyl benzyl wettable powder, the treatment dosage is 100g/m2, 200 g/m2, 300g/m2, 3. 1.2, produced by Jiangxi Shan Ye Chemical Company. The treatment dose is 55g/667m2, 1 10g/667m2. 3.2 The plot layout and plot experiment are divided into three categories: 1. The total amount of straw is returned to the field, and there are four treatments: (1) 35% butyl is applied five days after sowing. (2) On the 5th day after sowing, rice bran 100g/m2 and 35% butyl benzyl wettable powder 55g/667m2 were applied; (3) Five days after sowing, 200 g/m2 of rice chaff and 55 g /667 m2 of 35% butyl benzyl wettable powder were applied; (4) blank control. Second, half of the straw was returned to the field, with seven treatments: (1) 35% butyl benzyl wettable powder 1 10g/667m2 was sprayed on the 5th day after sowing; (2) applying rice chaff100g/m2 five days after seedling throwing; (3) applying 200g/m2 of rice chaff five days after sowing; (4) Five days after seedling throwing, 300g/m2 of rice chaff is applied; (5) Five days after sowing, rice bran 100g/m2 and 35% butyl benzyl wettable powder 55g/667m2 were applied; (6) applying 200g/m2 of rice chaff and 55g/667m2 of 35% butyl benzyl wettable powder five days after sowing; (7) blank control. 3. Straw is not returned to the field, and seven treatments are set: (1) 35% butyl benzyl wettable powder 1 10g/667m2 is sprayed five days after throwing; (2) applying rice chaff100g/m2 five days after seedling throwing; (3) applying 200g/m2 of rice chaff five days after sowing; (4) Five days after seedling throwing, 300g/m2 of rice chaff is applied; (5) Five days after sowing, rice bran 100g/m2 and 35% butyl benzyl wettable powder 55g/667m2 were applied; (6) applying 200g/m2 of rice chaff and 55g/667m2 of 35% butyl benzyl wettable powder five days after sowing; (7) blank control. *** 18 treatment, each treatment area of 40m2, repeated for three times. 3.2.2 The plot layout divides the experimental field into three parts: full straw returning, half straw returning and no straw returning. The treatment of each part is randomly arranged, and the treatment rooms are separated by small ridges. 3.3 Application Method 3.3. 1 Application Time and Frequency Apply once on July 27th. 3.3.2 Application tools and methods Chemical herbicides are mixed with urea, and rice bran is applied. 3.3.3 The weather data was sunny before the application, and sunny on the application day (July 27th), with the highest temperature of 38 degrees, and it turned cloudy from 28-3 1 sunny. In late July, the average temperature is 29.7 degrees, and in early and middle August, it is mainly sunny, hot and hot, with precipitation of 30-50 mm and average temperature of 28-30 degrees. 3.3.4 Soil data The soil in the experimental field is medium loam, with a ph value of 5. 1 and medium soil fertility. Apply 30 kg of compound fertilizer as base fertilizer before seedling throwing, and apply urea 15 kg as tiller fertilizer five days after seedling throwing. After rice bran treatment, the water layer was maintained at about 3-5cm 10d. 4. Investigation 4. 1 investigation time and content The species and quantity of weeds in the field were investigated 5 days,10 days,15 days, 20 days and 30 days after application. After harvest, measure the yield of each plot. 4.2 The survey method adopts the parallel jump method, and each treatment plot surveys 0.75m2, that is, each treatment plot surveys 3 points, and each point surveys 0.25m2 of weed species and quantity, and the survey data of each point is recorded separately (see the attached table for details). 4.3 Survey data and calculation of total number of weeds in control area-Control effect of total number of weeds in application area (%)= × 100 Total number of weeds in control area 4.4 Others 4.4. 1 Safety observation No phytotoxicity occurred in each plot after application, and rice grew normally. 4.42 During the experiment, conventional pesticides were applied once to protect the seedlings on August 2, and pesticides were applied once to control leaf roller and rice planthopper on August 25. 5. Analysis and evaluation of results (see attached table) Under the condition that the total amount of rice straw is returned to the field, the control effect of chemical herbicides is halved, and rice bran is equivalent to routine chemical weeding for 5 days; After treatment, 10d is much lower than that of conventional chemical weeding. After 15d, the control effect of 100g/m2 was lower than that of conventional chemical pesticides (62.3%), while that of 200 g/m2 was higher than that of conventional chemical pesticides (78.3%). The control effect of 20 days and 30 days after treatment was equivalent to that of conventional chemical weeding, and the control effect of adding 200 g/m2 30 days after treatment (765,438+0.7%) was significantly higher than that of conventional chemical weeding (62.8%). The control effect of adding 200 g/m2 after treatment 15d is better than that of conventional chemical weeding. When half of the straw was returned to the field, the weeding effect of single application of rice bran increased with the increase of dosage, and there was no significant difference between 200 g/m2 and 300 g/m2 treatments, which was significantly higher than that of 100 g/m2 treatment. The control effect is far lower than that of conventional chemical weeding, and the highest is 71.9% (20 days after 300 g/m2 rice bran treatment). The control effect of chemical herbicides on rice bran is equivalent to that of conventional chemical weeding, and there is little difference between adding 100 g/m2 and adding 200 g/m2. When the straw is not returned to the field, the control effect of chemical herbicides on rice bran is better, which is equivalent to that of conventional chemical weeding, and the lowest is 88.2%. The control effect of rice bran alone is much lower than that of conventional chemical weeding, and the highest value is 82.1%(after rice bran is treated with 300 g/m2, it is 10d). The control effect of each treatment increased obviously with the increase of dosage, and the increase was greater than that under the condition of returning half of straw to the field. Yield impact: compared with conventional chemical weeding, the yield loss without herbicide is the biggest, reaching 6500. When herbicide was halved and rice bran was applied, the highest yield loss was 3.93%, but when rice bran was applied alone, the highest yield loss was 6.4%( 100g/m2), and the rest was 4.5%. The yield loss decreased with the increase of rice bran dosage. .