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Detailed Explanation of the Cotton and Potato Intercropping Cultivation Model

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The cotton and potato intercropping model is applied on a relatively large area in the northern Jiangsu region. The symbiotic period of the two crops is not long, the mutual influence during the symbiotic period is small, and there is a complementary effect in fertilizer utilization. In the late growth stage of potatoes, the field has sufficient fertilizer and water, which is conducive to the seedling development of cotton, and can achieve high yields of both cotton and potatoes. Generally, the potato yield is 2000-2500 kg per mu, the cotton yield is 80-100 kg per mu, the output value per mu is 2500-3000 yuan, and the net income is 1500-2000 yuan. Generally, the bed width is about 3 m, and cotton is planted in wide and narrow rows

The cotton and potato intercropping model is applied on a relatively large area in the northern Jiangsu region. The symbiotic period of the two crops is not long, the mutual influence during the symbiotic period is small, and there is a complementary effect in fertilizer utilization. In the late growth stage of potatoes, the field has sufficient fertilizer and water, which is conducive to the seedling development of cotton, and can achieve high yields of both cotton and potatoes. Generally, the potato yield is 2000-2500 kg per mu, the cotton yield is 80-100 kg per mu, the output value per mu is 2500-3000 yuan, and the net income is 1500-2000 yuan.

Generally, the bed width is about 3 m. Cotton is planted in wide and narrow rows, with a wide row spacing of 150 cm and a narrow row spacing of 40 cm, and 4 rows of cotton are planted per bed. Potatoes are generally planted in early February in the wide cotton rows, with a row spacing of 75 cm, and 2 rows of potatoes are planted in the wide rows, with a plant spacing of 15-20 cm, 3500-4000 plants per mu, covered with plastic film to increase temperature and preserve moisture, promoting early growth and increased yield. Cotton is raised as seedlings and then transplanted, planted separately on both sides, with 1800-2000 plants per mu.

Select good varieties. For potatoes, choose high-yield, high-quality, early-maturing virus-free seed potatoes, such as Kexin No. 1, Holland 15, etc.; for cotton, choose new hybrid cotton varieties with strong growth vigor, strong individual yield formation capacity, and suitability for sparse planting, such as Suza No. 3, Kemian No. 3, Nannong No. 6, Sikang No. 3, etc.

Sow and harvest at the appropriate time. Potatoes are sown in early February, harvested promptly from early May to early June, and cleared from the field in early June; cotton is sown around April 10 and transplanted in mid-May.

Scientific fertilization. Potatoes require sufficient basal fertilizer. Before sowing, apply 2000-2500 kg of high-quality farmyard manure, 15 kg of urea, and 10 kg of potassium chloride per mu in the wide cotton rows; after harvest, promptly turn and bury the stems and leaves. Because the field has sufficient nutrients during the potato growth period, and its stems and leaves can be turned and buried in the field as basal fertilizer, fertilization during the cotton growth period should be appropriately adjusted. Generally, no fertilizer is applied in the early stage, and excessive growth should also be controlled. Flower and boll fertilizer should be applied heavily to ensure the fertilizer needs during the boll-setting period. In the later stage, if the growth vigor is weak, topdressing fertilizer should be applied.

Strengthen management. In early to mid-March, when potato seedlings emerge, promptly break the film to release the seedlings. During the tuber expansion period, water more to keep the soil loose and the moisture suitable. Because potatoes are a host of the second-generation tarnished plant bug, special attention should be paid to the control of tarnished plant bugs in cotton fields after harvest.

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