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Published in Agron J 98:774-780 (2006)
DOI: 10.2134/agronj2005.0229
© 2006 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Dietary Cation–Anion Difference of Timothy as Affected by Development Stage and Nitrogen and Phosphorus Fertilization

Sophie Pelletiera, Gilles Bélangerb,*, Gaëtan F. Tremblayb, Annie Brégarda and Guy Allarda

a Dép. de Phytologie, Faculté des Sciences de l'Agriculture et de l'alimentation, Université Laval, Québec, QC, Canada G1K 7P4
b Agric. and Agri-Food Canada, Soils and Crops Research and Development Centre, Québec, QC, Canada G1V 2J3


Figure 1
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  		Fig. 1. Diagrams of the first two principal component (PC) loadings and scores calculated for (A) each variate measured on timothy and (B) each treatment [four stages of development (S1: stem elongation, S2: early heading, S3: late heading, and S4: early flowering) and four N applications (0, 60, 120, and 180 kg N ha–1 referred to as N1, N2, N3, and N4, respectively)]. Values are based on the average of 2 yr, 2001 and 2002.

 

Figure 2
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  		Fig. 2. Potassium, Ca, P, S, and N concentrations as a function of dry matter (DM) yield of timothy fertilized with different N treatments in spring. Dotted lines are data from one N fertilization treatment; solid and dashed lines indicate the stages of development at sampling. Values are based on the average of 2 yr, 2001 and 2002. Standard error of the mean are presented in Table 2.

 




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