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겉뿌림 초지에 대한 삼요소시비수준이 초지생산성 및 식생에 미치는 영향
진신흠,고서봉,윤익석,이종렬,김문철 ( Sin Heum Jin,Seo Bong Ko,Ik Suk Yoon,Jong Yeol Lee,Moon Chul Kim ) 한국축산학회 1980 한국축산학회지 Vol.22 No.3
Orchardgrass (Dactylis glomerata C.), tall fescue (Festuca arundinacea L.), perennial ryegrass (Lolium perenne L.), Kentucky bluegrass (poa pratensis L.), and ladino clover ( Trifolium repens L.) were sown on a native grassl and dominated by Imperata cylindrica by the oversown method. When the different levels of nitrogen, phosphorus and potassium were applied, the following results were obtained : 1. The dry matter yields of whole pasture were increased by increment of nitrogen fertilizer. Of the newly sown pasture plants, the botanical composition of grasses was increased, but that of clover was decreased. 2. The botanical composition, however, was not influenced by the phosphorus and potassium level. The rate of the newly sown pasture plants in the second year was 20-63% and the ratio of the grasses and legume was 60 : 40. 3. There was statistically marked significance for the dry matter yield by the increment of nitrogen levels; 122.4㎏ (0 ㎏ N), 182. 6㎏ (O ㎏ N) and 230. 9㎏ (20㎏) per 10 a were shown in the first year while 111. 3㎏ (0 ㎏ N), 135. 2㎏ (10 ㎏ N) and 182. 8㎏ (20 ㎏ N) per l0a in the second year. 4. There was no difference among dry matter yields obtained from various phosphorus and potassium levels in the first year, whereas some increased yield was observed in the second year.