Nitrogen Response Relationships of Some Volcanic Ash Soils

Autor:	J. Michael Geist
Rok vydání:	1977
Předmět:	Geochemistry Soil Science Greenhouse chemistry.chemical_element engineering.material complex mixtures Nitrogen Agronomy chemistry Yield (wine) Soil water engineering Environmental science Fertilizer Polynomial regression model Volcanic ash
Zdroj:	Soil Science Society of America Journal. 41:996-1000
ISSN:	0361-5995
DOI:	10.2136/sssaj1977.03615995004100050038x
Popis:	Methods of assessing the N fertility status of ash soils and their relationship to plant parameters were studied in the greenhouse. Soils were collected from forested areas in the Blue Mountains of northeast Oregon. Highly significant regression relationships were obtained between soil N supply and N uptake of orchardgrass tops (R² = 0.97) or top yield (R² = 0.80) with responding ash soils. A polynomial regression model provided for organic, mineral, and fertilizer N supply sources. Soil organic N supply had a significant influence on plant performance over both narrow and broad ranges of fertilizer addition.
Databáze:	OpenAIRE
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