Description
Annual or autumn sown over-year-old herbs. Plant height is 30-100 cm. The taproot penetrates into the soil layer up to 50 cm. Stems erect or ascending, stout, pubescent, with longitudinal ribs. Palmate three compound leaves; stipules are oval, membranous, mostly connate with petioles, with 3-5 veins on each side, apex free part is ovoid triangular or round, hairy; petiole under stem is quite Long, shorter upper part, pubescent; leaflets broad to ovate to nearly round, 1.5-3.5 cm long, papery, blunt apex, sometimes slightly concave, broadly cuneate at base, narrowing to petiole, with wavy edges Obtuse teeth, sparsely pilose on both sides, 5-10 pairs of lateral veins, spread out at an angle of 40-50 degrees to the midrib, and the middle part is forked, slender and inconspicuous. The inflorescence is cylindric and terminal, and continues to elongate during flowering, 3-5 cm long and 1-1.5 cm wide; the total pedicel is longer than the leaf, 2.5-7 cm longer, thick; no involucre; with flowers 50-80(-120 ) Single, very dense; flower length 10-15 mm; few peduncles; calyx tube is short, calyx throat with a thickened hairy ring, constricted and closed in fruit; corolla dark red, vermilion to orange, flag petals Narrow ellipse, sharp pointed head, obviously closed wing petals and long keel petals; ovary broad ovoid, slender style, 1 ovule. The pods are ovoid; with 1 brown seed.
Crimson clover germinates quickly and emerges early. It is sown from early September to early October in Jiangsu area, turns green in early March, first blooms in mid-April, blooms in late April, ends in early May, matures in late May, full growth period 200-240 days, late broadcasting does not delay maturity. The root system is mainly distributed in the 15-25 cm soil layer, and the root width is greatly affected by soil moisture and tillage, generally 40-50 cm. Branches grow from the base of the stem and have strong branching ability. Generally, there are more than 5-10 branches in the field, and the maximum number of individual plants is more than 90. Early sowing plants have a certain amount of growth, and can still regenerate after cutting; the growth is the fastest from flowering to the bud stage, and its growth accounts for about 44% of the fresh grass in the blooming stage; while the growth of the plant height is based on the bud to the beginning The flowering period is the fastest, accounting for about 40% of the height of the plant in the full flowering period. Under natural conditions, the seed setting rate of autumn planting is high, and the seed setting rate of spring planting is low, and the seed is not full. But it is sown in Yichun in the north. Crimson clover can tolerate temperatures below 0°C. Under the condition of the lowest daily temperature of –7--13°C in a short period of time, it will only suffer from slight freezing damage, and its cold resistance is greater than that of arrow pea, early maturing leaves, milk vetch and golden cauliflower. However, the degree of cold resistance varies with the date of sowing, the presence or absence of rhizobia, and the depth of the root system. There are certain negative-tolerant plants that are semi-shadow-tolerant, but their negative-tolerance and moisture resistance are not as good as milk vetch. Drought tolerance is moderate. It has strong resistance to aphids.
