Effects of cutting frequency and nitrogen fertilization level on the dry matter yields of orchardgrass dactylis glomerata varieties

Lee, J.S.; Abe, J.

Korean Journal of Animal Science 26(4): 412-417


Accession: 005297680

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The response of 6 orchardgrass cultivars with different earliness grown under 2 cutting frequencies to different N fertilization levels with respect to dry matter yield was studied from the efficiency of N utilization viewpoint. Dry matter yield was not significantly different for the interaction of cultivar .times. N level. The cultivar with early maturing showed higher production of dry matter yield than that of the cultivar with late maturing characteristics. Dry matter yield of 2 cuttings was .apprx. 45% more than that of 4 cuttings. The dry matter yield increased almost linear up to .apprx. 320 kg/ha level with 4 cuttings, but the yield of 2 cuttings increased quadratically up to .apprx. 320 kg/ha. The predicted highest yields of 2 cuttings could be obtained at .apprx. 354 kg/ha (critical N level). 'Pennlate' attained the predicted highest yield at the lowest level (259 kg/ha) of N among 6 cultivars. Average increase in dry matter [DM] yield of cultivars to N fertilization was 27.34 kg DM under 2 cuttings and 20.88 kg DM/kg N under 4 cuttings, respectively. 'Kitamidori', 'Latar' and 'Potomac' belong to the group of high efficiency of N utilization, and 'Pennlate', 'Phyllox' and 'Masshardy' belong to the group of low efficiency of N utilization for dry matter production classified by the ranges of adequate N level in 2 cuttings. Critical N level showed a significant positive correlation (P < 0.05) with average increase in dry matter yield in 2 cuttings.