How to weed rape after sowing?

It is possible to pull the weeds by hand and by hand, so that the rape will not be harmed.

The best thing to do is to buy some low-toxicity herbicides, which are specially developed for vegetables and can remove weeds without harming them.

1。To control gramineous weeds in the field, herbicides can be used to control grasses and weeds in dryland broad-leaved crop fields, such as quinoxamine (such as barge, Qingxiu), pyroflufen, xoxazole, etc. 2 control of broad-leaved weeds in the field for different species of broad-leaved weeds in the field, and the sensitivity of weeds to pesticides can be selected different drug schemes, when the field with chickweed, cattle chickweed, finch tongue grass, broken rice camelina domestic, can choose to use grass control.

When the field is dominated by rice and cabbage, pig cabbage, mud cabbage, and large nest cabbage, there is no good medicine for stem and leaf treatment, and pre-seedling drugs can be used, such as Guangfen plus acetochlor. 3 control of both broad-leaved weeds and grasses in the field, such as broad-leaved weeds in the field with chickweeds, cattle chickweeds, finch tongue grass, etc., grasses to see wheat Niang, Japan to see wheat Niang, wild oats, etc., can choose to use grass control and refined quinoxalin mixture, such as Tian Ge and so on. Kind.

1. Manual weeding.

This is the simplest and most effective way to do this. This method can effectively reduce the harm of weeds, and the effect is particularly intuitive, but if the area of the rape field is too large, such a method is obviously not suitable, so it can be used in the early stage through cultivating the soil, and other physical control methods, the weeds within one year can be eliminated in the adult stage. Moreover, this method can also effectively cut off the root system of weeds, reduce its nutrient absorption capacity, and the biggest advantage of the physical method is that there is no return pollution to the soil, and the harm will be less than that of chemical methods.

2. Crop rotation.

This method is also very effective in stopping the growth of weeds, because if a piece of land is planted with one crop all the time, it will cause the nature of the land to change, and such a crop rotation system can change the environment in which weeds grow, because weeds are difficult to adapt to the changing growth environment. Therefore, the continuous crop rotation can effectively imitate the situation of the world's brothers. The easiest way to do this is to rotate wheat, rape and rice, as this can effectively inhibit the different characteristics of weeds.

When planting rice, weeds that adapt to the drought environment will die, and when planting rape and wheat, weeds that adapt to paddy fields will also not grow.

The herbicides used for rape field weeds are as follows:

Rapeseed field herbicides (only limited to cabbage-type rape fields) that kill dicotyledon weeds (only used in cabbage-type rape fields) are mainly grass killers: such as Gaotek, Haoshiduo, grass control, oil grass mai, etc.

Herbicides in single and dicoted weeds and killing rape fields are mainly grass control + quinoxalin mixtures, such as block knife, double grass buster, oil grass double gram, ** cover, close removal, etc. This kind of herbicide with hail is only limited to the use of cabbage-type oil-cultivated sail rapeseed fields, and mustard rapeseed varieties are prone to pesticide damage.

Rape

Brassicanapusl (Latin scientific name: brassicanapusl) is a herbaceous crop of the Brassica family in the family Brassicaceae. It is native to Europe and is widely cultivated around the world.

The sensitive periods of temperature and light sensitivity in European rape were 7-8 leaf stage and 10-12 leaf stage, respectively. Formed 7,000 years ago, the winter oilseed rape is suitable for growing in low-temperature areas.

Born more than 400 years ago, spring European rape has the shortest growth cycle; Semi-winter rapeseed with a wide suitable planting area was born in China more than 70 years ago, and after many generations of reproduction, European rapeseed hybridized to adapt to different growth conditions and have different characteristics. The European rape stem is erect and branched, with only a few scattered bristles on the young leaves.

petioles centimeter long, lobes at base; The middle and upper stems and leaves gradually change from oblong-elliptic to lanceolate, heart-shaped at the base, holding the stem; racemes, umbels; peduncle 6, 12 mm long; sepals ovate, petals pale yellow; The longhorn fruit is linear, and the beak of the fruit petal is thin; The peduncle is about 2 cm long; The flowering period is 3 to 4 months, and the fruiting period is 4 to 5 months.