Main weed species

The rapeseed field in our province can be divided into two types, namely drought and alfalfa and rice bran, depending on the type of former crop. The main weeds in the field of rapeseed rape include bluegrass, wild oats, swine crickets, wheatgrass, virginiana, peony, harps, leeks, orchids, lanka, alfalfa, wheatgrass, spiny, and small Convolvulus and so on, wild oats in some areas are seriously endangered. Indica and rapeseed weeds in fields can be seen in Maiconia, Japan in Apsara, hardgrass, and bluegrass. Others include headgrass, porcine cricket, cattle bramble, brackwort, big broccoli, leeks, and mother-in-law. The number of weeds was higher than that of drought-fed fields.

Occurrence characteristics

The rapeseed planting method was divided into two kinds: direct seeding, seedling transplanting, tilling method, splitting and tillage, and the occurrence of weeds under different cultivation conditions was significantly different. (1) The weeds on the bed of rapeseed should be based on A. aequalis, P. amygdalus, V. lagopus and T. variegate, and the peak of grassiness should be 7 to 10 days after sowing. The symbiosis period with rape is short, and the density of rape seedlings is large. It grows fast and the grass is lighter. (2) Rapeseed rapeseed field has a peak of grass growing 10-30 days after sowing and planting, and has a large amount of grass, which constitutes the main group of weed damage. The wetland weeds are dominated by broad-leaved species, and the amount of grass is relatively small; the weeds in paddy fields are dominated by grasses, and the amount of grass is more. (3) In the rapeseed field planted on board, the topsoil outside the sowing holes (rows) was not destroyed, and the weed seeds in the top soil before sowing had already germinated to form early weed communities in the field; The top layer of the hole (line) was destroyed, and the germination peak of the weeds sprouted in the sowing hole (row) and the upturned soil layer appeared 10 to 30 days after sowing.

After the beginning of spring, rape grows vigorously. Only a few kinds of weeds, such as big broccoli, swine fever, and wild oats, will have a great impact on the growth of rapeseed. Others will naturally disappear due to the unpleasantness of rape fields. With the exception of a few late-growing and late-planting plots with poor oilseed rape, spring weeds in the field had little effect on rapeseed and could not be dealt with.

Prevention technology

Before planting and planting rapeseed, rapeseed, rapeseed, rapeseed can be sprayed with 41% glyphosate 100-150 ml or 20% paraquat water 200-250 ml plus 30 kg water.

The time of damaging weeds in rapeseed beds during soil closure treatment is short, and the advantage of rapeseed populations is easy to form. It only needs to ensure that the seedlings grow safely in the early stage. Can be used after sowing rape seedlings per acre with 60% butachlor EC 75 ~ 120 ml or 50% valerian oil 200 ~ 250 ml, add water, spray 40 ~ 45 kg, soil closure treatment. After rapeseed sowing before broadcasting and transplanting rapeseed before transplanting, it can use 96-percent of refined metolachlor EC 45-60 ml, or 48-percent isoprene 50 ml, or 50% acetochlor EC 75 per mu. ~ 100 ml water spray, soil closure treatment.

Stem and leaf treatment of rapeseed fields mainly in grass weeds, can be used in the weeds before the 4 leaf stage, select 10.8% efficient fluphanopyrazole Ling EC 20 ~ 30 ml, or 15% quizalopyr EC 35 ~ 50 ml , Or 6.9% of fenazole oxime grass spirit EC 40 ~ 50 ml, add water 40 kg spray control. For small plots such as small broccoli, sow wormwood, rice leeks, boiled vegetables, wild geranium, etc., 50% of herbicides can be sprayed with 30-40 ml of water and 40 kg of water per acre. The hard-grass and bluegrass-based plots can be sprayed on the weeds at the 3 to 4 leaf stage with 24% clitorone EC 20 to 30 ml and water 40 kg/mu.

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