The invention discloses a late-dense-simplified cotton cultivation method adopting chemical
topping. The late-dense-simplified cotton cultivation method comprises the following steps of
sowing in the first ten-day period of May, performing final singling at a 2-3-leaf stage, and controlling the density of reserved seedlings at 5,500 to 6,000 plants / mu; then spraying a chemical
topping agent for three times: at the first time, spraying when 60 percent of plants in a cotton field reach 9 to 10 fruit branches, and spraying to tips of leaf branches and fruit branches by using a mixed liquid of
mepiquat chloride and
flumetralin according to the ratio of 2:1, at the second time, spraying when 60 percent of cotton plants in the cotton field reach 10 to 11 fruit branches, and spraying to top ends of cotton
plant stems by using a mixed liquid of the
mepiquat chloride and the
flumetralin according to the ratio of 1:2; at the third time, spraying at the sixth to eighth day after second spraying, and spraying to whole plants by using a mixed liquid formed by adding the
mepiquat chloride and
flumetralin according to the ratio of 1:1, and 0.05 percent of
urea. According to the late-dense-simplified cotton cultivation method disclosed by the invention, rotten bolls are reduced and
premature senescence is alleviated by proper late
sowing; density increasement and chemical
topping are used to replace artificial
pruning and topping, so that labor and time are saved, and net incomes are remarkably increased.