Premium
Predicting the response of perennial ryegrass to fertilizer nitrogen in relation to cutting interval, climate and soil
Author(s) -
DOYLE C. J.,
RIDOUT M. S.,
MORRISON J.,
EDWARDS C.
Publication year - 1986
Publication title -
grass and forage science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 56
eISSN - 1365-2494
pISSN - 0142-5242
DOI - 10.1111/j.1365-2494.1986.tb01819.x
Subject(s) - perennial plant , grassland , nitrogen fertilizer , mathematics , agronomy , fertilizer , nitrogen , environmental science , interval (graph theory) , statistics , soil science , biology , chemistry , organic chemistry , combinatorics
This paper describes the derivation of a series of equations for estimating mean grass production on cut swards under different fertilizer nitrogen, soil and climatic regimes. Using data from the National Grassland Manuring Trial GM20 for a late flowering perennial ryegrass, equations have been estimated for the individual cuts. On the basis of data from cutting trials at Hurley, equations for extrapolating yields under cutting strategies with different first cut dates and regrowth intervals have been derived. The resultant model for predicting yields has then been tested against data obtained from two separate cutting trials. Although in individual cases significant differences between predicted and observed mean yields were noticed, in general the predicted yields were a reasonable approximation to observed yields. Comparison of the predicted yields with those derived from an earlier study by the authors indicated an improvement in the accuracy of prediction.