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稀土是化学元素Ⅱ副族钪、镇镧系元素的统称,是一种很好的植物生理调节剂,对促进林木速生丰产、稳产优质具有明显的作用。据有关研究,林木施用微量稀土元素后植株根系生长发育;体内的叶绿素含量增加,促进光合效率;植株吸收养分能力也明显增强。生产实践表明,用于浸种有促进种子发芽,促进苗木生长,提高苗木质量的作用。用500ppm硝酸稀士浸种4-8小时,松树种子发芽率可提高19-20％。杉木、马尾松、木荷、板栗苗经80-200ppm液叶面喷施处理,苗高生长量比对照增加20-50％。叶面喷施100-1000ppm硝酸稀土液
Rare earth is the second group of chemical elements Ⅱ scandium, the town of lanthanides collectively, is a good plant physiological regulator, to promote fast-growing forest yield, stable production of high quality has a significant role. According to relevant research, the root growth and development of plants after application of trace rare earth elements in forest trees can increase the content of chlorophyll in the body and promote the photosynthetic efficiency; and the ability of plants to absorb nutrients is also obviously enhanced. Production practice shows that the seed soaking for the promotion of seed germination and promote the growth of seedlings, seedlings improve the quality of the role. With 500ppm nitric acid soaked seedlings 4-8 hours, the pine seed germination rate can be increased 19-20%. Cunninghamia lanceolata, Pinus massoniana, Schima superba and chestnut seedlings were sprayed with 80-200ppm foliar spray, the growth of seedling height increased by 20-50% compared with the control. Foliar spraying 100-1000ppm rare earth nitrate solution