The effect of mineral nitrogen fertilization on grassland production under various cutting frequencies. I. Dry matter yield and estimation of optimum rate of mineral nitrogen fertilization in orchardgrass (Dactylis glomerata L.)

Jo, I.H.; Lee, J.S.; Ahn, J.H.

Journal of the Korean Society of Grassland Science 14(2): 69-75


Accession: 002712744

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Application of 0, 30, 60, 90 or 120 kg N/ha at each cut with 3, 4 or 5 cuts per year were investigated in a D. glomerata sward. DM yields were highest in the 1st cut of the 3-cut regime (49% of annual DM yield) and in the 2nd cuts of the 4- and 5-cut regimes (both 37% of annual DM yield). DM yield was increased by increasing levels of fertilizer N. In the 4- and 5-cut regimes increases in DM yield were largest at 30 kg N/ha. At 90 kg N/ha/cut (4-cut) and 60 kg N/ha/cut (5-cut) DM yields were reduced. The most economic levels of N fertilizer application for all cutting regimes were at levels lower than those at which the highest DM yields were obtained.