In order to increase the herbicidal effect and expand the herbicidal spectrum, most of the compound herbicides contain benzylsulfuron, pyrazosulfuron, acetochlor, etc. If the farmers do not understand the use, it is easy to cause phytotoxicity.
First, the judgment of phytotoxicity
Rice has symptoms similar to those of herbicides due to roots, deficiency or pests, but it is still possible to determine whether it is a herbicide by investigation and analysis.
1. Judging from the period of application and the amount of application: If the time for applying pesticides to control pests and diseases is 1 to 2 days after rice insertion (throwing), it is more sensitive and sometimes phytotoxic. High doses of individual pesticide products are also prone to phytotoxicity.
2, check the water and soil conditions: the water is too deep after the medicine (immersion growth point), easy to produce phytotoxicity. Check whether the plant has poor growth symptoms due to improper fertilization or application of unfertilized organic fertilizer, or improper use of straw and green manure.
3. Checking pests and diseases: Rice plants damaged by rice tube thrips and rice roots will become short clusters, and the tip of the leaves will be tubular and rolled up, and the roots will be short. The symptoms of rice common dwarf disease are mainly yellowing and shrinking of the leaves. The plants are dwarfed, fading from the top tip, and broken plaques appear, but the veins remain green, and the leaves often show obvious yellow-green stripes.
4, look at the growth of seedlings before and after application: after rice transplanting (throwing) 秧 normal back to green (little seedlings), if abnormal symptoms occur after application, and the growth of other similar cultivars with other varieties of the same species may be Drug damage.
Second, remedial measures
1. Re-inserted (throwing) 秧: After diagnosis, it is confirmed that the seedlings are seriously damaged, and the seedling yellowing accounts for more than 80%. It is necessary to raise the seedlings to immediately insert (throw). Operation method: first clear the field water, lightly plow once and then discharge the turbid water, and then insert (throwing). In recent years, the season of sowing and cutting (throwing) has been 7 to 15 days earlier than the traditional season. It is generally 5 to 10 days to find the phytotoxicity to the patch, and the seasonal contradiction is not prominent.
2, strengthen fertilizer management and cultivating: found that the phytotoxic field must first clear the applied field water, into the fresh live water. Followed by ploughing in the field, the chemicals adsorbed by the topsoil were turned into deep soil to reduce the effect of the agent on the roots of rice. 2 to 3 days after the Putian, the application of imported compound fertilizer 2 to 4 kg, promote root length and accelerate growth.
3. Application of rooting agent: After draining, hoeing and fertilizing, it is best to apply a rooting agent abt 200 kg with a concentration of 200 mg/kg per mu, which has a good effect on promoting roots, and the number of roots can be increased by 25% to 40%. Can accelerate the growth rate.
First, the judgment of phytotoxicity
Rice has symptoms similar to those of herbicides due to roots, deficiency or pests, but it is still possible to determine whether it is a herbicide by investigation and analysis.
1. Judging from the period of application and the amount of application: If the time for applying pesticides to control pests and diseases is 1 to 2 days after rice insertion (throwing), it is more sensitive and sometimes phytotoxic. High doses of individual pesticide products are also prone to phytotoxicity.
2, check the water and soil conditions: the water is too deep after the medicine (immersion growth point), easy to produce phytotoxicity. Check whether the plant has poor growth symptoms due to improper fertilization or application of unfertilized organic fertilizer, or improper use of straw and green manure.
3. Checking pests and diseases: Rice plants damaged by rice tube thrips and rice roots will become short clusters, and the tip of the leaves will be tubular and rolled up, and the roots will be short. The symptoms of rice common dwarf disease are mainly yellowing and shrinking of the leaves. The plants are dwarfed, fading from the top tip, and broken plaques appear, but the veins remain green, and the leaves often show obvious yellow-green stripes.
4, look at the growth of seedlings before and after application: after rice transplanting (throwing) 秧 normal back to green (little seedlings), if abnormal symptoms occur after application, and the growth of other similar cultivars with other varieties of the same species may be Drug damage.
Second, remedial measures
1. Re-inserted (throwing) 秧: After diagnosis, it is confirmed that the seedlings are seriously damaged, and the seedling yellowing accounts for more than 80%. It is necessary to raise the seedlings to immediately insert (throw). Operation method: first clear the field water, lightly plow once and then discharge the turbid water, and then insert (throwing). In recent years, the season of sowing and cutting (throwing) has been 7 to 15 days earlier than the traditional season. It is generally 5 to 10 days to find the phytotoxicity to the patch, and the seasonal contradiction is not prominent.
2, strengthen fertilizer management and cultivating: found that the phytotoxic field must first clear the applied field water, into the fresh live water. Followed by ploughing in the field, the chemicals adsorbed by the topsoil were turned into deep soil to reduce the effect of the agent on the roots of rice. 2 to 3 days after the Putian, the application of imported compound fertilizer 2 to 4 kg, promote root length and accelerate growth.
3. Application of rooting agent: After draining, hoeing and fertilizing, it is best to apply a rooting agent abt 200 kg with a concentration of 200 mg/kg per mu, which has a good effect on promoting roots, and the number of roots can be increased by 25% to 40%. Can accelerate the growth rate.
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