The invention discloses an efficient and safe weeding method for a tropical
upland rice field, and belongs to the technical field of agricultural planting. The method comprises the following steps: spraying
glufosinate-
ammonium to kill germinated weeds 10-15 days before
sowing; (after
sowing and before emergence of seedlings, spraying
butachlor and
bensulfuron methyl to form a pre-emergence closed
pesticide film; 15-20 days after
seedling emergence, spraying a compound preparation of
quinclorac and pyrazosulfuron-ethyl in a ratio of 1: 1 and a compound preparation of
MCPA and
fluroxypyr in a ratio of 1: 1; 30-35 days after
seedling emergence, a cyhalofop-butyl / haloxysulfuron-methyl and penoxsulam compound agent is sequentially applied, and
brassinolide and
monopotassium phosphate are sprayed 3 days after secondary
pesticide application; supplementing and preventing in the middle and later tillering periods, and spraying
naphthylacetic acid,
urea and
monopotassium phosphate 3 days after weeding. The water adding amount in each stage is dynamically adjusted according to the
soil water content, the method is suitable for the tropical
upland rice area with the
annual average temperature larger than or equal to 25 DEG C, the annual rainfall larger than or equal to 1500 mm and the
humidity larger than or equal to 80%, and through five-stage
time sequence cooperation and precise intervention of the conditioning agent, the
weed control effect larger than or equal to 95.2% is achieved, and the
phytotoxicity grade is 0 grade.