Both of them can produce high yield by interplanting potato with insect-resistant cotton.

In recent years, the potato intercropping model of insect-resistant cotton has been welcomed by the masses. According to investigation, this model can not only make cotton obtain high yield (lint cotton 90~100 kg per mu), but also "pick up" 1500~2000 kg potato per mu. The key points of planting technology are as follows.

1. Potato seed selection and germination. It is advisable to select virus-free varieties with early maturity, short stem and high yield, such as Holland 7, Jinyin 8, etc., with 80~90 kg seed potatoes per mu. In the middle of February, seed potato pieces (each kilogram is divided into 40~50 pieces) are germinated by using sun beds or sheds. After about 25 days, when the bud grows to 2~3 cm, sow. (2) Soil preparation and fertilization. From the end of February to the first ten days of March, soil preparation is carried out, and 2~5 cubic meters of farm manure, 25~30 kilograms of potassium sulfate, 20 kilograms of diammonium phosphate, 15 kilograms of urea and 3 kilograms of multi-element micro-fertilizer are applied per mu. 3. Furrow sowing. Sowing from the time of hibernation to the vernal equinox, when the temperature is stable at 7℃: first, open the sowing ditch according to the large row spacing of 1.2 meters and the small row spacing of 0.3~0.4 meters, apply chemical fertilizer into the ditch, and mix it with the soil evenly, sow the blocks according to the plant spacing of 22~25 cm, and the density is 3500~3800 plants per mu. After sowing, the soil is ridged (7~12 cm high and 60~70 cm wide), sprayed with herbicides such as trifluralin and dinoseamine, and covered with plastic film. Scientific management. When seedlings emerge, the membrane is broken and seedlings are released in time. In the middle of April, water should be poured at the right time, and soil moisture should be planted for cotton at the same time. Spraying paclobutrazol at 100 mg/kg at budding stage prevented excessive growth of plants. After that, water was poured 2~3 times to make the potato expand. Pay attention to timely removal of aphids, mites, etc.

2. Seed selection of insect-resistant cotton ①. SGK321 and Xinmian 33B are ideal varieties. 2. Ridging and intertillage. Potato watering hair after the tree, in the reserved large row in time to cultivate, cover soil to make a turtle-shaped short ridge. 3. Sowing. Around April 20, two rows of cotton are planted in holes on the ridge according to the row spacing of 40~50 cm and the plant spacing of 20~25 cm, and herbicide is sprayed after sowing, and then plastic film is covered.④ Field management. After emergence, the seedlings were introduced, thinned and fixed in time, with 3300~4000 plants per mu. After potato harvest, its stems and leaves will be turned into soil as green manure, after the film is removed in late June, urea and diammonium phosphate will be applied 10kg per mu in combination with watering, and other management is the same as that of ordinary cotton fields.