First, the disciplines are classified differently.
1, isatis indigotica
Potamogeton crispus, also known as bulbous cabbage, broom bluegrass, tamarind, leaving a column, not leaving a guest, having a knot in one's heart and so on. Belongs to Cruciferae, Cruciferae, Brassica, Brassica.
2. mustard
Mustard, also known as cabbage, mustard, hanging vegetables and so on. It belongs to Papaveraceae, Cruciferae, Brassica and Mustard.
Second, the morphological characteristics are different.
1, isatis indigotica
30 ~ 60 cm high. The whole plant is smooth and hairless. The stems are short, oblong, spherical or oblate, fleshy bulbs with leaves, with a diameter of 5 ~ 10 cm or more. The outer skin is usually light green, green or purple, and the inner pulp is white. Leaf blade ovoid or ovoid oblong, smooth, covered with white powder, with obvious teeth or notches on the edge. Flowers yellow and white, arranged in racemes, sepals 4, narrow and erect, petals spread in a cross shape. Pods are long and cylindrical, with short beaks and swollen bases. The seeds are small, spherical, with a diameter of 65438±0 ~ 2mm and tiny teeth. Flowers bloom in spring.
2. mustard
The height can reach 150 cm, the young stems and leaves are prickly and spicy, the stems are erect, and the petioles are lobulated; The lower leaves of the stem are small, with serrated or serrated edges, and the upper leaves of the stem are narrow and lanceolate, with inconspicuous sparse teeth or entire edges. Racemes are terminal, elongated after flowering, with yellow flowers, pale yellow sepals, oblong or oval, erect, obovate petals, silique linear, spherical seeds and purple brown. It blooms in March-May and bears fruit in May-June.
Third, the growth environment is different.
1, isatis indigotica
Kohlrabi likes mild, moist and plenty of light. It is cold-resistant and has the ability to adapt to high temperature. The optimum growth temperature is 15-20℃. Fleshy stems are prone to fibrosis when exposed to high temperature above 30℃ during the expansion period. The choice of soil is not strict, but it is suitable for planting in clay loam or sandy loam with rich humus.
2. mustard
Mustard likes cold, cool and wet environment, avoiding heat, resisting drought and frost, and needs strong light. The suitable growth temperature is 15-22℃. When the temperature is higher than 25℃, the growth is slow. Mustard is not very strict with soil conditions, but it is suitable for neutral loam with fertile soil, deep soil layer, good irrigation and drainage conditions, sufficient sunlight, good permeability and water and fertilizer conservation.