The invention belongs to the technical field of
weed prevention and control, and discloses a
weed prevention and control method for an alfalfa-corn
relay intercropping field, which comprises the following steps: investigating weeds in the
relay intercropping field; a compound
fertilizer is applied before alfalfa seeds are sown, alfalfa is sown between 15 cm lines according to the line spacing of 15-45 cm to 15 cm, and
trifluralin is sprayed after the alfalfa seeds are sown; spraying imazethapyr, haloxyfop-methyl, red, ethylidene.
brassica campestris
wettable powder and
vitamin E
ovalbumin. Suspending agent when alfalfa seedlings grow 3-5 leaves; after one
crop or two crops of alfalfa are
cut, corn seeds are sown in the 45 cm line spacing, and Yingnissi is sprayed after the corn seeds are sown; a stem and leaf treating agent is sprayed, wherein
mesotrione and 0.316% of red, indazim and
brassica campestris
wettable powder are added; after corn is sown, alfalfa is not
cut any more, and alfalfa and corn are harvested together in the
wax ripening stage of the corn. According to the method, alfalfa and corn
relay intercropping planting is adopted, the maximum production potential of two kinds of
forage grass can be exerted, the utilization efficiency of land and light resources is improved, and consumption of water and
nitrogen resources and pressure on the environment are reduced.