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Details van artikel 141 van 164 gevonden artikelen
| Titel: |
The effects of volcanic ash influenced soils and nitrogen fertilization on douglas-fir seedlings |
| Auteur: |
Brady, Thomas F. Loewenstein, Howard |
| Verschenen in: |
Communications in soil science and plant analysis |
| Paginering: | Jaargang 14 (1983) nr. 2 pagina's 101-113 |
| Jaar: |
1983 |
| Inhoud: |
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. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 141 van 164 gevonden artikelen
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