The rice transplanting machine has high requirements for seedlings, and there are some strict requirements for the density of sowing, the height of seedlings, and the growth of roots. If the requirements are not met, it is very likely that the seedlings will be scattered, the leaves will be damaged, or even "upside down onions" will occur. The recommended seeding rate is about 10 catties per mu of land, about 560-640 catties for a seedbed of about 360 square meters, and about 2 and a half seeds per tray. This is for plastic blanket trays. The seeding density is also the seeding density of the most common seedling raising trays. If the density is too small, the root system is insufficient, and it is easy to scatter flowers; if the seeding rate is too large, the first leaf is easy to rot due to ventilation problems, which affects the later tillering of rice, because the tillering of rice in Northeast China is the same as the first 3-4 leaves. Extend tiller, the first leaf rots, and the same extension tiller of the first leaf is gone.

Seedling height should be controlled within 15cm as much as possible. Northeast dry-growing strong seedlings are generally transplanted at about 3.5-4 leaves of leaf age. When the seedling age is 3.5 leaves, the plant height is about 11-12 cm, which is the normal height of strong seedlings. If it reaches 15 cm, the distance between the rice stems and leaves is too large, which is not conducive to the greening of the seedlings. If the height of the seedling is more than 15 cm, it is not a strong seedling, the stem is thin, the leaves are slender, the greening is slow, the dead seedling rate is high, and the height is too high, it is easy to transplant the leaves with the claws during mechanical transplanting. In the field, the root system is outside. Therefore, it is necessary to control the height of the seedlings, and the easiest way is to adjust it through moisture and ventilation.

Under normal circumstances, seedlings with about 3.5 leaves have 11-14 root systems, and the number of root systems that can reach 11 is normal. Requires many roots and white roots. In fact, this has something to do with the seeding rate. If the seeding amount is insufficient, no matter how good the root system is, it cannot guarantee the integrity of the seedling tray when transplanting. If the seeding amount is sufficient and the root growth is insufficient, it will also affect the integrity of the rice transplanter on the seedling tray, which is what we often call the seedling tray scattered flowers. The most common occurrence of this situation is excessive watering and the effects of bacterial wilt and bacterial wilt. For the number of operations per day, the hand-held small six-row rice transplanter is about 15 acres, the operating area of ​​the ride-on rice transplanter is about 25-30 acres, and the high-speed ride-on rice transplanter is about 50-60 acres. About 1-1.5 acres.

Under normal circumstances, there is no need to move the plot, and if the plot is large and good, the working efficiency of the walk-behind 6-row rice transplanter is about 30-40 mu, and the high-speed riding type is 40-60 mu/day. The six-row ride-on rice transplanter can transplant about 2 to 3 hectares a day, and a maximum of 2 to 3 hectares a day.
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