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Fig. 3. Dry matter yield of ryegrass grown after application of poultry manure, mineral fertilizer, and no N. Bars are divided into ryegrass harvested in the year of sowing (black) and cumulative ryegrass yield of the three cuts in the second (gray) and third (white) year after initiation of the experiment. Standard errors are shown for the cumulative yield (n = 3). Bars denoted with the same letter are not significantly different (P = 0.05).
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