摘要
农业上应用稀土已取得显著效益。为准确地肯定稀土对林业苗木的增产效用,并摸索关键技术,1987年至1989年,在温室和田间进行泡桐实生苗水培和埋根苗应用试验。水培试验部分地采用了植物稳态营养研究的理论和方法。
From 1987 to 1989, applied experiments with seedlings and rooted cuttings have been carried out both in greenhouse and nursery. It was shown that 5 ppm NL-1 or NL-32 treatment was optimum for P. elongata and P. tomentosa seedlings in solution culture experiments partly by steady state nutrition, average biomass increments of seedlings were up about 40 % in comparison with control (no rare-earth). The growth of seedlings was inhibited at 50 ppm without ajusting pH value of culture solution (about 4), whereas biomass increased by 7% ~30 % for P. elongata seedlings after ajusting pH near 6 with CaCO3. Spraying the leaves of nursery stocks in Paulownia spp. with NL-1 complex rare-earth solution at 50 ppm for the early two times and 75 ppm once later (pH5.0~5.5), the percentage of first class nursery stocks raised by a big margin in comparison with control, direct extra income per ha will be 3 000 yuan per year.
出处
《林业科学研究》
CSCD
北大核心
1990年第3期275-279,共5页
Forest Research
关键词
泡桐
复合稀土
苗木生长
增产作用
喷施技术
Paulownia spp.
complex rare-earth
growth of seedling and nursery stock