Cultivation method for drip irrigation of cotton fields in saline-alkali soil

A cultivation method for drip irrigation of cotton fields in saline-alkali soil, comprising the following steps:

• (1) performing land preparation, comprising:
• plowing the soil with a plow depth being greater than 28 centimeters (cm), and performing subsoiling with a subsoiling depth being required to be in a range of 35-50 cm;
• (2) laying a film with a thickness of 0.01 millimeters (mm), setting 6 seed rows per film, one seed per hole;
• spacing configuration with a wide row spacing 63 cm and a narrow row spacing 13 cm, or a wide row spacing 64 cm and a narrow row spacing 12 cm;
• and 9.5-10 cm of a hole spacing within each of the seed rows;
• (3) laying drip irrigation capillary tubes, comprising:
• laying the drip irrigation capillary tubes under the film with three drip irrigation capillary tubes per film, and each of the drip irrigation capillary tubes being laid in a middle of two rows of the seed rows;
• wherein when a dripper of the drip irrigation capillary tube is disposed on one side of the drip irrigation capillary tube, the dripper faces downward and faces an outer row of the two rows of the seed rows;
• and when the dripper is disposed at a middle of the drip irrigation capillary tube, the dripper faces upward, or the drip irrigation capillary tube is laid beside to an inner row of the two rows of the seed rows and the dripper faces downward and faces an outer row of the two rows of the seed rows with a distance from the inner row of 7 cm and within 20 cm from the outer row;
• (4) performing a drip irrigation mode, comprising:
• dripping water for seedling emergence once within 48 hours after sowing under a condition of avoiding rainy weather with no irrigation and no ridges of field before sowing, wherein a water volume is in a range of 10-15 m3/mu and there is water in each seed hole, stopping drip irrigation immediately when the water in the two adjacent seed holes is just communicated;
• dripping the water for seedling emergence again in the seed holes after 5-6 days of the dripping water for seedling emergence once within 48 hours after sowing, with a water volume of 10-20 m3/mu, and waiting for seedling emergence;
• dripping water for seedling survival once 5-7 days after the seedling emergence with a water volume of 10-15 m3/mu;
• dripping the water for seedling survival again after another 5-7 days with a water volume of 10-15 m3/mu, wherein the water volume is increased and times of the dripping is increased 1-2 times, until water irrigation is prepared in early June;
• (5) fertilizing with water, comprising:
• adding 3-5 kg/mu of a saline-alkali soil amendment every time when dripping the water for seedling emergence, adding 3-5 kg/mu of the saline-alkali soil amendment for a first time of dripping the water for seedling survival with adding 0.5-2 kg/mu of potassium dihydrogen phosphate and 100-200 g/mu of zinc fertilizer, and adding 3-5 kg/mu of the saline-alkali soil amendment every time after the first time of dripping the water for seedling survival;
• wherein the saline-alkali soil amendment is humic acid soil amendment;
• and
• (6) performing intertillage, comprising:
• performing the intertillage once after seedling rows are presented, and performing the intertillage after rain and at low temperature, wherein 3-4 times of the intertillage are performed after the sowing and before budding, with a depth of 10-22 cm, and an anti-pressure arched steel plate is carried with an intertillage vehicle to prevent damaging the drip irrigation capillary tubes;
• wherein the method further comprises:
• performing a first chemical control after cotton seedlings are exposed and the soil is sealed by spraying 0.5-1 g/mu of mepiquat chloride;
• performing a second chemical control at a three-leaf stage of the cotton seedlings by spraying 1-2 g/mu of mepiquat chloride;
• and performing a third chemical control according to a growth condition of the cotton seedlings after the cotton seedlings entered a bud stage by spraying 3-5 g/mu of mepiquat chloride;
• wherein green prevention and control before the water irrigation is a main task, and specific operations of the green prevention and control of diseases, pests and weeds are as follows:
• blocking timely an edge of field before sowing, drying and coating seeds, spraying the soil with herbicides to protect predatory natural enemies, hanging yellow sticky cards, blue sticky cards, insecticidal lamps, and syrup bottles, and pulling weeds manually to preliminarily control the diseases, the pests and the weeds;
• wherein specific operations of the intertillage comprises:
• a tillage depth of a first intertillage is in a range of 10-12 cm, and a seedling protection zone is 10 cm;
• after the first intertillage, the tillage depth is increased by 3-5 cm each time until the tillage depth is increased to 22 cm, the seedling protection zone is kept at 8 cm;
• and 4-5 times of the intertillage are carried out.