The present application relates to the technical field of sustainable cultivation of dryland
agriculture, in particular to a green covering method for
winter wheat-potato
rotation system in semi-
arid areas, aiming at the problems of
mulch covering
pollution,
soil water supply-demand imbalance, poor adaptability of
straw covering, etc. in
winter wheat-potato rotation in semi-
arid areas of 450-550mm rainfall in the
Loess Plateau of Northwest China, a combined mode of "
winter wheat straw covering + winter rape / arrow pea covering in the pre-potato fallow period" is constructed, and the
mulch covering is completely replaced by optimizing the configuration of covering crops,
sowing period, density,
tillage technology and field management parameters. The present application realizes the complete replacement of
mulch covering by
straw mulching, covering crops winter rape / arrow pea suppressing
evaporation and fertilizing, combined with vertical deep rotary loosening and rotary
tillage technology, which eliminates residual film
pollution, at the same time, the rainfall interception rate during the fallow period is greater than or equal to 45%, the
soil water content in the 0-200cm soil layer before
sowing is increased by 15%-20% compared with bare land, and the annual accumulation rate of soil organic carbon is greater than or equal to 0.3g·kg ‑1 .