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Effects of nitrogen and potassium fertilizer application on Drechslera spp. and Puccinia coronata on perennial ryegrass ( Lolium perenne ) foliage
Author(s) -
LAM A.,
LEWIS G. C.
Publication year - 1982
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1982.tb02820.x
Subject(s) - lolium perenne , drechslera , biology , perennial plant , agronomy , potassium , lolium , fertilizer , poaceae , botany , chemistry , organic chemistry
In a field experiment nitrogen (N) fertilizer was applied to small plots of perennial ryegrass ( Lolium perenne ) at rates equivalent to 0, 200, 400 and 600 kg N/ha/yr at each of two levels of potassium (K) 0 and 200 kg K/ha/yr. Plots were cut at 6‐week intervals during 1977–79 and dry matter yield was determined. Water‐soluble carbohydrate and N content of the foliage were measured at three harvests in 1977. The incidence and severity of Drechslera spp. were assessed at and between harvests; attack by Puccinia coronata was assessed each autumn. Most foliar damage was caused by Drechslera spp. This was increased by N application which also altered the relative proportions of the Drechslera spp. present. K application had no apparent effect on disease incidence. Puccinia coronata was more prevalent on older leaves and on one occasion its incidence was increased by N application.