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Response of a weed community to nitrogen fertilization: a multivariate analysis
Author(s) -
Pyšek Petr,
Lepš Jan
Publication year - 1991
Publication title -
journal of vegetation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 115
eISSN - 1654-1103
pISSN - 1100-9233
DOI - 10.2307/3235956
Subject(s) - weed , fertilizer , agronomy , ammonium nitrate , human fertilization , composition (language) , canonical correspondence analysis , ammonium , nitrogen , interaction , nitrogen fertilizer , competition (biology) , nitrate , chemistry , environmental science , biology , ecology , habitat , linguistics , philosophy , organic chemistry
The effect of nitrogen fertilizers on the composition of a weed community was investigated in a barley field. Two doses (70 and 140 kg N/ha) of three fertilizers (ammonium sulphate, calcium‐ammonium nitrate, and liquid urea) were used. The results were evaluated using the canonical correspondence analysis. Hybrid analyses and various combinations of environmental variables and co variables were used to separate the influence of the dose and the type of fertilizer and to separate the direct and indirect effects of fertilization. The results reveal that both the dose and type of fertilizer have a significant effect on the composition of the weed community. The results suggest that both the direct effect of fertilizer and an indirect effect, through increased competition of the crop, are important determinants of weed community composition.