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Sorghum cultivation is a precise and effective agricultural practice that enhances yield and quality. The method involves preparing high ridges by incorporating fully decomposed organic fertilizer at a rate of 5,000 to 6,000 kg per mu, along with 30 kg of potassium sulfate and 40 kg of diammonium phosphate. The land is then deeply plowed to a depth of 25 to 30 cm, ensuring the soil is well-saturated and fine. For each mu, an additional 20 kg of diammonium phosphate is applied, and high and low ridges are created from north to south. The cross-section of the high ridge is trapezoidal, standing 20 cm tall, with a base width of 60 cm and a top width of 40 cm. A 20 cm gap is left between the ridges, serving as a watering channel. Before planting, water is poured to settle the ridges and level them, making the field ready for strawberry seedlings. In eastern Hebei, planting typically occurs between mid-August and early September.
For double-row dense planting, two rows are placed on each high ridge, with a small row spacing of 20 cm and a large row spacing of 60 cm. Each plant is spaced 10 cm apart, resulting in a density of 16,675 plants per mu. When planting, the seedlings are arched outward, away from the ridge, and planted at an appropriate depth—neither buried in the heart nor exposed to the roots. Water is poured during planting, and after the entire field is planted, a thorough irrigation is done. Watering continues every evening for three days, followed by every other day until the plants are established.
Once the plants have survived, a black mulch 90 cm wide is placed over the high ridges, with a plastic film covering both rows. This mulch serves three key purposes: protecting the roots, reducing air humidity, and preventing weed growth. Other planting techniques follow conventional practices.
High-ridge cultivation offers five major benefits. First, it supports dense planting, allowing for higher yields. With leaves growing upward and deeper furrows acting as ventilated corridors, the group effect increases yield significantly. Our density of 16,675 plants per mu is 1.3 to 3.3 times higher than in other areas, leading to an average yield of 4,000 to 5,000 kg per mu—over 60% more than flat planting.
Second, this method saves water by replacing flood irrigation with drip-like water channels, reducing water usage by 30–40%. It also prevents soil compaction around the roots.
Third, field management becomes easier. The walkways between ridges allow easy access, and the plants grow outward, keeping the fruit off the ground. This makes tasks like thinning, pest control, and harvesting much more efficient.
Fourth, high-ridge cultivation promotes the accumulation of organic matter. By creating a wavy surface, the soil’s surface area increases by over 30%, enhancing solar energy absorption. This leads to faster warming during the day and cooling at night, increasing the temperature difference, which helps in the transformation and buildup of organic nutrients.
Finally, fruit quality improves. Fruits hang on the sides of the ridges, receiving more sunlight, resulting in better size, color, and taste. Watering also avoids direct contact with the fruit, reducing contamination and disease spread.
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