58 



THE MANURING OF GRASS LAND 



[CH. 



Yorkshire fo? Downy oat Quaking-grass 



(Holcus lanatus) (Avena pubescens) (Briza media) 



Fig. 12. Poor hay plants. Signs that something is wrong. Yorkshire fog indicates 

 wetness or sourness, and Downy oat and Quaking-grass indicate poverty. 



