Bullitta, Simonetta Maria and Motroni, Paolo and Sulas, Leonardo (1993) Plant response to fertilization and sheep grazing on rangeland in Sardinia. Rivista di agronomia, Vol. 27 (1), p. 67-72. ISSN 0035-6034. Article.
A four-year study (1981-1985) was conducted to determine the response to fertilizer applications and the effects of sheep
grazing on productivity and botanical composition of a natural rangeland in Sardinia. A site of three hectares was enclosed and
divided in two plots which were alternately grazed and rested by moving 12 ewes from one plot to the other. Nitrogenous and
phosphatic fertilizers were applied. Botanical composition after grazing was monitored by means of exclosures moved to
adjacent positions at the end of every trial year. Samplings of forage production were made at different times of the year and the
effects of early winter and late utilization on spring regrowth were studied. Dry matter production showed to be markedly
affected by climatic trends but was not influenced by fertilization. A stocking rate of 0.25 ha per animal unit had no detrimental
effect on sward composition and production although the normal stocking rate for the area was less than half of that utilized for
the present experience.
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