Using the variable-speed rotary seeding and fertilizing machine for field operations.

4. Ground use:

(1) When entering the field for cultivation and seeding, avoid applying excessive hydraulic pressure at once—instead, gradually lower the equipment into the soil as the main machine moves forward. Otherwise, the seed and fertilizer tubes may become clogged. While operating the tractor’s throttle, keep the engine speed above 2,000 rpm during seeding.
(2) When entering the field and tilling for about 10 meters, stop to check the tillage depth, which should be between 10 and 12 cm. During operation, the central linkage pin should be adjusted to the middle position of the slot. The seeding depth for wheat should be 2–5 cm.
(3) When the machinery is operating, the main machine’s hydraulic system is in the floating position. As long as the tillage depth and seeding depth are normal, the machinery can perform tillage and seeding smoothly. During operation, the front depth-limiting wheel and the rear compaction roller both remain in contact with the ground, and the middle connecting rod pin is positioned midway between the holes in the machinery’s suspension frame bars. This design accommodates uneven terrain and enables the machinery to closely follow the contours of the land, ensuring consistent tillage and seeding depths.
(4) Hard courts shall be adjusted according to the standard adjustment procedures.
(5) When adjusting the depth-limiting wheels for soft or yielding soil, you must add the depth to which the tractor’s drive wheels depress the ground. For example, if the front depth-limiting wheel is set to 10 cm but depresses the ground by 5 cm, this wheel should be adjusted to a setting of 15 cm. Note: Otherwise, you may end up with seeds planted too deep, excessive tractor drag, narrow seed rows, and low emergence rates.
(6) When sowing in wet, sticky soils or on fields with thick straw and vegetation that tend to cause blockages, remove the depth-limiting wheel. Install the middle tie-rod pin into the round hole on the suspension frame, and use the main machine’s hydraulic limiters to control the tillage and seeding depth. ① Adjust the lead screws of the tractor’s left and right lifting tie rods, shortening them to their minimum lengths and ensuring that both sides are evenly adjusted—this sets the front-depth limiter for the seeder and ensures horizontal alignment of the equipment from side to side. ② Use the central tie rod to adjust the front-to-back horizontal alignment. ③ After testing the tillage over a 10-meter stretch, if the seeding depth meets the requirements, proceed with normal operations. If the seeding depth is too shallow, extend the left and right lifting tie rods as needed until the desired tillage and seeding depth is achieved. If the tillage and seeding depth is too deep, operate the hydraulic system to raise the equipment to the required depth and then lock the hydraulic limiters. (Sowing travel speed: 4–6 kilometers per hour.)
Special order! For all friends using the YAAO wide-sowing wheat seeder, if you need to increase the number of seedlings per mu, simply adjust the seed quantity as needed—absolutely do not increase the number of rows! This patented wide-sowing seeder actually occupies more than twice the land area of a conventional seeder. For example, a 2-meter seeder typically comes with 11 to 12 rows in market models like disc seeders, with each row spaced 3 cm apart. In contrast, the YAAO wide-sowing seeder has 8 rows, with each row spaced 12 cm apart; thus, the total spacing per row is 3 cm × 12 rows = 36 cm. Meanwhile, the YAAO single-row spacing is 12 cm × 8 rows = 96 cm. Dividing 96 cm by 36 cm yields 266%. As these figures clearly show, increasing the number of rows not only provides no benefit but also leads to problems such as seeding blockage and higher costs.

Precautions:
① When adjusting the front left and right depth-limiting wheels and the rear compaction rollers, the depth-setting holes on both sides must be adjusted to match exactly.
② In the normal seeding condition, the central drawbar suspension pin should be positioned in the middle of the implement’s suspension hole. (This is crucial for ensuring seeding quality: if the pin is positioned too far forward, it can easily cause the rear compaction roller to slip, leading to skipped seeds and missing seedlings; if the pin is positioned too far back, it may cause the tractor’s weight to damage the implement and compromise the uniformity of seeding.)