Large area crimping of rice heart leaves may be related to excessive application of dichloroquinolinic acid.
Recently, hundreds of readers from various parts of our province have called to report the phenomenon of heart leaf curl in large areas of rice seedlings, which is more common in direct seeding rice production. A lot of readers sent in diseased plants. In general, the roots of diseased plants are relatively normal, and there are no obvious disease spots and other symptoms on the leaves. After examining the diseased plants, relevant experts from the Institute of Plant Protection of the Provincial Academy of Agricultural Sciences and other units concluded that the curl of rice heart leaves was not caused by pathogenic microorganisms such as viruses, but could be caused by herbicides such as 2mai 4murD and dichloroquinolinic acid, or by physiological causes.
In recent years, it has been widely found that the control effect of dichloroquinolinic acid on older barnyardgrass with more than 4 leaves is not good, and it is necessary to increase the dosage in order to achieve a better control effect. In production, the dosage of 50% dichloroquinolinic acid wettable powder per mu is generally about 50 grams. Especially in the direct seeding rice field, the older barnyardgrass is usually above the 4-leaf stage in the rice field from 2-leaf to 3-leaf stage, and it is necessary to increase the dosage of dichloroquinolinic acid in order to effectively control it. However, there is a great risk of drug damage when using dichloroquinolinic acid at high dose in rice seedling stage.
In addition, rice is flooded in many parts of our province this year, and direct seeding rice is more serious. The seedling quality of flooded rice is weak, and the root growth is poor, so the use of high dose of dichloroquinolinic acid is more prone to drug damage.
In view of a large number of rice heart leaf curling phenomenon in the current production, if the rice field has been excessively applied dichloroquinolinic acid and other herbicides before the disease, gibberellin and brassinolide can be used to alleviate the damage. Gibberellin can stimulate the growth of rice, but it has an inhibitory effect on tillers. It should be diluted 50000 times in the tillering stage, slightly higher after the tillering stage and 30000 times diluted. For the injured seedlings, it is best to pull them out and transplant them in the field to make them thinner. By strengthening the fertilizer and water management of the diseased fields, the damaged rice plants can generally resume their growth gradually after a period of time.
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Dan Handao No. 2 (formerly known as K150 Rice)
Variety source: breeding characteristics from Danjing 5 system: this variety belongs to conventional japonica upland rice variety. the average growth period of one cropping upland rice in the north is 153.7 days, which is 10 days longer than that of the control Han72. The plant height is 78.51cm, the ear length is 13.72cm, the highest number of seedlings per mu is 346600, the panicle rate is 71.94%, the number of grains per ear is 99.59, the seed setting rate is 84.96%, and the 1000-grain weight is 21.9g. Resistance: the average drought resistance in each pilot field was 2.4, and the leaves
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Measures to promote the development of rice root system
1. Broadcast early at the right time. When the temperature is stable for 5 ℃, it begins to sow and raise seedlings. When the temperature is stable for 5 months, the seedlings are sterile for 5 months, and when the temperature is stable for 13 ℃, the seedlings are started to transplant. The seedlings are not planted for 6 months, and they are planted in the high yield period to gain accumulated temperature, which is beneficial to the development of roots. 2. Carefully prepare the land and create conditions. To do a good job of ploughing and rotary ploughing, the general ploughing depth is 20 cm, the rotary ploughing depth is 14 cm, and the ploughing or rotary ploughing depth is the same, so that there is no mud in an inch of water, creating conditions for root system development. 3. Strengthen management and promote development. First, seedling field management, good temperature control, reasonable watering, foliar fertilizer spraying, prevention and control.
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