Residual effect of dairy sludges as fertilizer on nw spain tree cover grassland production
Autor: E. Carral, C. Moirón & E. López Mosquera
In the spring of 1995 two types of permanent grassland (Dactylis glomerata-Trifoliumsp. and Lolium perenne-Trifolium sp.) were sown in Castro de Ribeiras de Lea-Lugo(NW Spain) on silvicultural systems (two kinds of plantation frame). Grasslandproduction was compared between control (without fertilization), mineral fertilizer (500kg ha-1 of 8-24-16 complex application per year) and dairy-plant sludge fertilizer (154 m3ha-1, DM= 25 g -1 l). The dairy sludge application was only in the first year, 1995. In Julyof each year (1995, 1996, 1997) four samples were randomly taken from each plot (72sampling plots) and dry weight was determined.
In this study we found a positive residual effect of dairy sludge fertilization on grasslandproduction in the second year after tree and meadow implementation. In the third year,dairy sludge effects as a fertilizer was not evident. The plantation frame showed asignificant influence on forage production.
