田菁(Sesbama cannabina)是一年生豆科植物。小灌木或半灌木状草本,高约1米,有的可达2—3米。根粗壮发达,着生很多根瘤。叶为羽状复叶。荚果圆柱状条形,长15—18厘米,直径2—3毫米,有种子20—32粒。田菁原产于热带,是一种喜欢温度高的作物。种子在15℃以上始能发芽,20—30℃发芽最快。幼苗和植株在气温降至0℃并持续两小时以上时即行死亡。田菁耐涝、耐旱并耐盐碱。卤盐土的0—10厘米表上层含盐量不超过0.4%时能出全苗,而棉、麦作物遇到这样的盐分浓度,出苗即受到抑制。田菁出苗生长一个月后,表土层含盐量虽增 Sesbama cannabina is an annual legume. Small shrub or semi shrub herb, about 1 meter high, some up to 2-3 meters. Roots developed, with a lot of nodules. Leaves for pinnate compound leaves. Pods cylindrical bar, 15-18 cm long, 2-3 mm in diameter, 20-32 seeds. Sesbania is native to the tropics and is a type of crop that prefers high temperatures. Seed germination at 15 ℃ above, 20-30 ℃ germination the fastest. Seedlings and plants die when the temperature drops to 0 ° C for more than two hours. Tian Jing waterlogging, drought and salt. Halogenated saline soil 0-10 cm above the salt content of not more than 0.4% of the whole seedlings, and cotton, wheat crop encountered such a salt concentration, emergence is inhibited. Tian Jing emergence of a month after growth, although the amount of topsoil salt increased