COMPARISON OF DIRECT AND INDIRECT METHODS OF MEASURING FERTILIZER N UPTAKE IN WINTER WHEAT

Autor:	H. H. Janzen, T. L. Roberts
Rok vydání:	1990
Předmět:	chemistry Resolution (mass spectrometry) Agronomy Isotope dilution method Winter wheat engineering Soil Science chemistry.chemical_element Environmental science Fertilizer engineering.material Nitrogen Application methods
Zdroj:	Canadian Journal of Soil Science. 70:119-124
ISSN:	1918-1841 0008-4271
DOI:	10.4141/cjss90-014
Popis:	Two methods of estimating fertilizer N uptake (FNU) were compared using 11 site-years of data from four winter wheat experiments comparing different N sources, application methods and application times. Direct (15N) and indirect (difference) estimates of FNU were significantly correlated in 10 of the 11 site-year combinations. When plant uptake of applied N increased, both methods provided similar estimates of FNU and allowed treatment effects to be separated with comparable resolution. Neither method nor time of application had any apparent effect on the ability of the two methods to estimate FNU. Key words: Difference method, isotope dilution method, 15N, fertilizer efficiency, fertilizer recovery
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::df8447de7d4a27c9b9eee9159c3cf3b2 https://doi.org/10.4141/cjss90-014 Zobrazit plný text záznamu