The invention discloses a method for controlling
salinity of medium and severe salinized soils applicable for cotton culture. Before
sowing of cotton, ditching is performed by means of traction, wherein ditches are straight and are consistent in depth;
crop straws are crushed and then covered in the ditches, the ditches are filled and levelled up by using soils and then are compacted; during
sowing of the cotton,
drip irrigation zones are paved to be above the ditches according to a
mulch row spacing and a junction row spacing,
drip irrigation is performed immediately after
sowing, an
irrigation volume is 30-40m<3> / mu (1 mu equals to 0.0667 hectares); from a
trefoil stage to a harvesting stage during a growth period of the cotton, a high-frequency
drip irrigation method is adopted. According to the method disclosed by the invention, by means of establishing a salt resisting layer, the cotton is subjected to dry sowing and wet
germination, the salt is controlled to be below the resisting layer; in a sowing area of the cotton, the
salinity is controlled to be below 6g / kg, so as to guarantee
germination of the cotton; during a growth period, a high-frequency drip
irrigation way is adopted to establish a desalting area for growth of the cotton, so that in a soil layer of 0-30cm, the
salinity is controlled to be 10g / kg, in this way, a technical problem in salinity control of medium and severe salinized soils during cotton culture is solved, and the method has an important application value.