The standard of strong seedlings of rapeseed

The morphological characteristics of robust rape seedlings are as follows: the seedlings are short and sturdy, the internodes are shortened, and the leaf order is closely arranged; the leaves are large and moderate, showing normal green, and the petiole is thick and short; the root system is well developed, the main root is thick, there are many branches and fine roots, there are many young roots, and the root neck is thick and short. When transplanting, it reached the "Panax notoginseng standard", that is, 7 green leaves, 23 cm high seedling, 0.7 cm thick root neck, appropriate seedling age, many white roots, no tall seedlings, no diseases and insects.