The effects of volcanic ash influenced soils and nitrogen fertilization on douglas‐fir seedlings
作者:
ThomasF. Brady,
Howard Loewenstein,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1983)
卷期:
Volume 14,
issue 2
页码: 101-113
ISSN:0010-3624
年代: 1983
DOI:10.1080/00103628309367346
出版商: Taylor & Francis Group
关键词: volcanic ash soils;nitrogen fertilization;pot bioassays;undisturbed soil;Douglas‐fir
数据来源: Taylor
摘要:
An experiment was conducted to help understand the contributions of different soil layers to soil fertility, plant growth, and response to fertilization. Douglas‐fir (Pseudotsuga menziesii) seedlings were used in a pot bioassay to delimit the effects of volcanic ash soils, urea fertilization at 100 and 200 ppm, and the technique of using undisturbed soil as a growth medium. Volcanic ash horizons contained more available phosphorus and mineralized more nitrogen than underlying horizons. Best seedling growth occurred in ash horizons fertilized with 200 ppm of urea‐N. Fertilization decreased soil pH, mycorrhizae formation and foliar‐P levels but increased foliar‐N. The technique of using undisturbed soil had little effect on seedling growth in the weak structured ash horizons but did decrease root weights in the moderate structured sub‐ash layers.
点击下载:
PDF (405KB)
返 回