不同播种量对甘肃礼县掌叶大黄育苗质量的影响

通过在甘肃礼县采收三年生掌叶大黄种株种子并采用不同播种量(35,45,55,65,75和85 kg/hm²)育苗,育苗结束后测定苗栽质量指标,移栽定植到大田后定期测定成活率,旨在揭示播种量对掌叶大黄苗栽质量的影响,为其规范化栽培提供依据。结果表明,在甘肃礼县育苗时种子播种量对掌叶大黄育苗质量具有极显著影响,在35 kg/hm²最低播种量基础上,随着播种量的增大育成苗栽数持续增多,苗栽产量先显著提高后下降,但苗栽根长、根粗、单苗重和根系TTC还原强度等个体质量指标均呈降低趋势,播种量为65 kg/hm²时苗栽产量最高,单苗鲜重和根系TTC还原强度减小程度较轻,苗栽综合指标优异,生长健壮,大小适中,产苗数多,移栽成活率高,说明从育苗质量和育苗效益综合考虑,甘肃礼县掌叶大黄育苗适宜种子播种量为65 kg/hm²。

Effect of different sowing quantities on seedling quality of Rheum palmatum

To explore the effect of sowing quantity of Rheum palmatum seeds on seedling quality and to provide a basis for the standardization of cultivation, the seeds of triennium R. palmatum plants were harvested. The quality indicators of their seedlings cultured under different sowing rates (35, 45, 55, 65, 75, 85 kg/ha) were measured at the end of nursery culturing and the survival rate of the nursery stocks were determined at intervals after transplanting into a field in Li county, Gansu. The sowing rate had a significant influence on seedling quality. At the lowest rate (35 kg/ha), the seedlings continued to increase and their yield significantly increased but it decreased as the sowing rate was increased. However, quality indicators such as root length, root diameter, single seedling weight, root reduced-intensity of TTC (2,3,5-triphenyltetrazolium chloride) all decreased. The single fresh weight and root reduced-intensity TTC in the seedlings cultured at a sowing rates above 65 kg/ha were relatively reduced but at this rate, seedlings showed the highest yield, the best synthesis indicators, good growing and development, condition, size, and higher transplant survival-ratevs. Considering the seedling quality and economic benefit in nursery production, a sowing rate of 65 kg/ha is good for culturing R. palmatum seedlings in Li county of Gansu.