A method of segmental thinning of millet by using herbicide

Abstract

The invention discloses a method for performing segmented seedling thinning on millet by use of a herbicide. A first millet kind only resistant to a sethoxydim herbicide, a second millet kind only resistant to a imazethapyr herbicide and a third millet kind both resistant to the sethoxydim herbicide and the imazethapyr herbicide are mixed according to the proportion of a seeding rate (0.8-1.2): (0.8-1.2): (0.8-1.2) to form a mixed millet kind for sowing, and after emergence of seedlings, chemical seedling thinning is realized through praying the corresponding herbicides, wherein one half of the first millet kind only resistant to the sethoxydim herbicide and one half of the second millet kind only resistant to the imazethapyr herbicide are selected and processed by use of a prometryn herbicide, and the millet subjected to processing by use of the prometryn herbicide dies naturally after 2-3 leaf stages after emergence of the millet seedlings. According to the invention, the seedling thinning method is simple, the condition of a too large seedling number or high seedling density does not occur later, the working strength of farmers is greatly mitigated, the number of the seedlings can be flexibly controlled, segmented seedling thinning is realized, and seedling emergency uniformity is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of chemical thinning, and in particular relates to a method for segmental thinning of millet by using herbicides. Background technique [0002] One of the main problems in millet planting is thinning and weeding. At present, breeders have bred some herbicide-resistant varieties, which have initially solved the problem of chemical weeding. In order to solve the problem of thinning, the following methods are currently used: [0003] 1. The chemical thinning technology of Shanxi Millet Research Institute, through the treatment of grain seeds with MND chemicals, and then mixed with normal grain seeds, the grain seeds treated with MND chemicals will die at the 2-3 leaf stage after emergence, thus reducing the risk of thinning. However, the number of thinning seedlings of this technology has been determined at the seed treatment stage. In the event of unfavorable weather conditions, the emergence of fewer seedling...

AI Technical Summary

Problems solved by technology

[0003] 1. The chemical thinning technology of Shanxi Millet Research Institute, through the treatment of grain seeds with MND chemicals, and then mixed with normal grain seeds, the grain seeds treated with MND chemicals will die at the 2-3 leaf stage after emergence, thus reducing the risk of thinning. However, the number of thinning seedlings of this technology has been determined at the seed treatment stage. In the event of unfavorable weather conditions, the emergence of fewer seedlings cannot be remedied. If there are too many seedlings in the later stage of emergence, artificial thinning is still required, and MND agents are not easy to purchase, which affects the actual use.

[0004] 2. Hebei Millet Research Institute breeds herbicide-resistant (also resistant to Atrazine and Natura or monoclonal resistant varieties) and non-herbicide-resistant sister lines or near-isogenic lines, and then mixes them in proportion to sow. (Pre-emergence use of atrazine) By spraying the matching herbicide, the seedlings that are not resistant to herbicides are killed, so as to achieve the effect of thinning and weeding. However, the pre-emergence soil spraying of atrazine is affected by the moisture and climate Larger, after seedlings can only be sprayed and netted for the second thinning, the number of dead seedlings is difficult to predict, and the third thinning cannot be carried out

It can be seen that none of the above three methods can effectively realize the thinning work, and the seed propagation work is still strong.