• 제목/요약/키워드: clipping weight

검색결과 41건 처리시간 0.023초

질소시용 및 예초간격이 한국 잔디(Zoysia japonica Steud.)의 제잔디 구성요소 특성변화에 미치는 영향 (The Effect of Nitrogen Application and Clipping Interval on the Characteristics of Several Turf Components of Korean Lawn Grass (Zoysia japonica Steud.))

  • 심재성;윤익석
    • 아시안잔디학회지
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    • 제1권1호
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    • pp.18-29
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    • 1987
  • This study was carried out to examine the effect of nitrogen application and clipping interval on the characteristics of several turf components of korean lawngrass for the basic data of lawn management. It was treated by Split plot design with three replications. The main plots were nitrogen levels with 0, 350, and 700kgN / ha, and the sub plots were clipping intervals with 10, 20, and 30 days The results obtained are summarized as follows ; 1. Increasing the rate of nitrogen fertilizer and frequent clipping increased tiller number of korean lawngrass and the maximum number of tillers obtained in October were recorded from 700kgN application and clipping treatment of 10 days interval. Meanwhile, treatment of 350kgN with 10 days clipping interval increased tillers much more than those of 700kgN with 20 and 30 days clipping intervals. 2. The average number of green leaves occurred during the growth period maximized by applying 700 kgN and clipping 10 days interval. 3. Increasing tiller numbers significantly decreased tops DM weight per tiller by clippng plants at interval of 10 and 20 days, irrespective of nitrogen applied, and with nil N, at the interval of 30 days. By applying 700kgN however, tops DM weight per tiller increased as the number of tillers increased consistently. 4. The highest tops DM weight was achieved from late August to early September by applying 350 and 700kgN. 5. During the growth period, nitrogen application increased unders(stolon+root) DM weight, and, at the same level of nitrogen applied, the increase in stolon DM weight enhanced by lengthening the clipping interval to 30 days. 6. Nitrogen efficiency to green leaves, stolon nodes and DM weight of root with high nitrogen was achieved as clipping interval was shortened.

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질소시용, 예초 및 재식밀도가 한국잔디(Zoysia Japonica Steud)의 생육에 미치는 영향 (Studies on the growth of Korea Lawn Grass (Zoysia japonica Steud.)in Reponse to Nitrogen Application, Clipping Treatment and Plant Density)

  • 심재성
    • 자연과학논문집
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    • 제1권
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    • pp.61-113
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    • 1987
  • The increasing emphasis placed on the production of fine turf for lawns, golf courses, parks, and other recreational sites has led to many unsolved problems as to how such turf could be best established and mainteined. For this purpose, a series of experiments were conducted under con ditions of pot and field. The results obtained were as follows EXPERIMENT I. The effect of nitrogen fertilizer and clipping interval on Zoysia japonica. 1. Increasing the rate of nitrogen and frequent clipping increased tiller number of Zoysis japonica and the maximum number of tillers were obtained from 700 kg N application and freqnent clippings (10 days interval ) in October. Treatment of 350kg N with 10 days clipping interval increased tillers much more than those of 700 kgN with 20 and 30 days clipping intervals. 2. The average number of green leaves occurred during the growth period maximized by applying 700 kg N and clipping 10 days interval. 3. Increasing tiller numbers significantly decreased tops DM weight per tiller by clipping plants at interval of 10 and 20 days, irrespective of nitrogen applied, and with nil N, at the interval of 30 days. By applying 700 kg N, however, top DM weight per tiller increased as the number of tillers increased consistently. 4. The highest top DM weight was achieved from late August to early September by applying 350 and 700kgN. 5. During the growth period, differences in unders ( stolon + root ) DM weight occurred bynitrogen application were found between nil N and two applied nitrogen levels, whereas, at the same level of nitrogen applied, the increase in stolon DM weight enhanced by lengthening the clipping interval to 30 days. 6. Nitrogen efficiency to green leaves, stolon nodes and DM weight of root with high nitrogen was achieved as clipping interval was shortened. 7. By increasing fertilizer nitrogen rate applied, N content n the leaves and stems of Zoysiajaponica was increased. On the other hand, N content in root and stolon had little effect onfertilizer nitrogen, resulting in the lowest content among plant fractions. The largest content of N was recorded in leaves. Lengthening the clipping interval from 10 or 20 to 30 days tends to decrease the N content in the leaves and stems, whereas this trend did not appeared in stolon androot. 8. A positive correlations between N and K contents in tops and stolon were established andthus K content increased as N content in tops and stolon increased. Meanwhile, P content was not affected by N and clipping treatments. 9. Total soluble carbohydrate content in Zoysia japonica was largest in stolon and stem, and was reduced by increasing fertilizer nitrogen rate. Reduction in total soluble carbohydrate due to increased nitrogen rate was severer in the stolons and stems than in the leaves. 10. Increasing the rate of nitrogen applied increased the number of small and large vascular bundles in leaf blade, but shortened distance among the large vascular bundles. Shortening the clipping interval resulted in increase of the number of large vascular bundles but decrease ofdistance between large vascular bundles.EXPERIMENT II. Growth response of Zoysia japonica imposed by different plant densities. 1. Tiller numbers per unit area increased as plant density heightened. Differences in num ber between densities at higher densities than 120 D were of no significance. 2. Tiller numbers per clone attained by 110 days after transplanting were 126 at 40D,77 at 80D, 67 at 120D, 54 at 160D, and 41 at 200D. A decreasing trend of tiller numbers per clone with increasing density was noticable from 100 days after transplanting onwards. 3. During the growth period, the greatest number of green leaves per unit area were attainedin 90days after transplanting at 160D and 200D, and 100 days after transplanting at 40D, 80Dand 120D. Thus the period to reach the maximum green leaf number with the high plantdensity was likely to be earlier that with the low plant density. 4. Stolon growth up to 80 days after transplaning was relatively slow, but from 80 daysonwards, the growth quickened to range from 1.9 m/clone at 40D to 0.6m/clone at 200Din 200 days after transplanting, these followed by the stolon node produced. 5. Plant density did not affect stolon weight/clone and root weight/clone until 80 daysafter transplanting. 6. DM weight of root was heavier in the early period of growth than that of stolon, butthis trend was reversed in the late period of growth : DM weight of stolon was much higherthan that of root.EXPERIMENT Ill. Vegetative growth of Zoysia japonica and Zoysia matrella as affected by nitrogen and clipping height. 1. When no nitrogen was applied to Zoysia japonica, leaf blade which appeared during theAugust-early September period remained green for a perid of about 10 weeks and even leavesemerged in rate September lived for 42 days. However, leaf longevity did not exceed 8 weeks asnitrogen was applied. In contrast the leaf longevity of Zoysia matrella which emerged during the mid August-earlySeptember period was 11 weeks and, under the nitrogen applied, 9 weeks, indicating that thelife-spen of individual leaf of Zoysia matrella may be longer than that of Zoysia japorica. Clipping height had no effect on the leaf longevity in both grasses. 2. During the July-August period, tiller number, green leaf number and DM weightof Zoysia japonica were increased significantly with fertilizer nitrogen, but were not with twolevel of clipping height. This trend was reversed after late September ; no effect of nitrogen wasappeared. Instead, lax clipping increased tiller number, green leaf number and DM weight. Greenleaves stimulated by lax clipping resulted in the occurrance of more dead leaves in late October. 3. Among the stolons outgrown until early September, the primary stolon was not influencedby nitrogen and clipping treatments to produce only 2-3 stolons. However, 1st branch stoIon asaffected by nitrogen increased significantly, so most of stolons which occurred consisted of 1st branch stolons. 4. Until early September, stolon length obtained at nil nitrogen level was chiefly caused bythe primary stolons. By applying nitrogen, the primary stolons of Zoysia japonica waslonger than 1st branch stolons when severe clipping was involved and in turn, shorter than 1stbranch stolons when lax clipping was concerned. In Zoysia matrella, 1st branch stolons were muchlonger than the primary stolon when turf was clipped severely but in conditions of lax clippingthere was little difference in length between primary and 1st branch stolons. 5. Stolon nodes of both Zoysia japonica and Z. matrella were positively influenced by nit rogen, but no particular increase by imposing clipping height treatment was marked in Zoysiamatrella. Although the stolon of Zoysia japonica grew until late October, the growthstimulated by nitrogen was not so remarkable as to exceed that by nil N.

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예초잔여물을 제거하지 않은 조건에서 질소의 시비가 Colonial Bentgrass의 생육과 Thatch 축적에 미치는 영향 (The Effect of Nitrogen Fertilization on the Growth and Thatch Accumulation of Colonial Bentgrass grown under Removing Clipping Residues)

  • 이주삼;윤용범
    • 아시안잔디학회지
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    • 제5권2호
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    • pp.69-73
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    • 1991
  • This experiment was carried out in order to study the effect of nitrogen fertilization on the growth of Colonial bentgrass and thatch accumulation under no removing clipping residues. Nitrogen fertilization was applied as 4 levels, 10, 20, 25 and 20gN/m$^2$, respectively. The results were as follows : 1.Response of plant length and dry weight of thatch to N fertilization were significant differences between N levels. It suggested that N fertilization with no clipping residues greatly affected to the growth and thatch accumulation of colonial bentgrass.2.Plant length, the dry weight of clipping residues and coverage were obtained the highest values at 20g N. It was assumed that 20gN/m$^2$ is the limiting N level to obtain the favorable growth of Colonial bentgrass. 3.The dry weight of thatch and lignin content were increased with high nitrogen fertilization level. 4.The dry weight of thatch indicated positive significant correlation with lignin content. 5. The dry weight of thatch per N(THg/N) at 20g~25g/m$^2$ levels were obtained the lowest values than of other levels of N. It may be due to the stimulating of microbial activity by adequate to N fertilizers which increased mineralization of thatch.

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질소시용 및 예초고가 한국 잔디(Zoysia japonica Steud.) 및 금잔디(Zoysia matrella MERR.)의 생육후기 영양생장에 미치는 영향 (Effect of nitrogen application and clipping height on the vegetative growth of Korean lawn grass (Zoysia japonica Steud.) and Manilagrass (Zoysia mat rella (L.) MERR.) during September/October)

  • 심재성;윤익석
    • 아시안잔디학회지
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    • 제1권1호
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    • pp.7-17
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    • 1987
  • The experiment with two levels of nitrogen (0. and 300kg / ha / year) and two levels of clipping height (1.5cm and 4cm) was conducted on the field during the period 3 June to 23 October 1985. Clonal lines of korean lawngrass ( Zoysia japonica Steud.) and manilagrass ( Zoysia matrella ( L.) Merr.)of Daejon origin were established in June, as individual clone in rows 30cm apart with a 40cm spacing between clones, actually 4 clones each plot. The results obtained were as follows : 1. When no nitrogen was applied to korean lawngrass, leaf blade which appeared during the August / early September period remained green for a period of about 10 weeks and even leaves emerged in late September lived for 42 days. However, leaf longevity did not exceed 8 weeks as nitrogen was applied. In contrast the leaf longevity of manilagrass which emerged during the mid - August / early September period was 11 weeks and, under the nitrogen applied, 9 weeks, indicating that the life - saen of individual leaf of manilagrass may be longer than that of korean lawngrass. Meanwhile, clipping height had no effect on the leaf longevity in both grasses. 2. During the July / August period, tiller number, green leaf number and DM weight of korean lawngrass were increased significantly with fertilizer nitrogen, but were not with two levels of clipping height. This trend was reversed after late September : no effect of nitrogen was appeared. Instead, lax clipping increased tiller number, green leaf number and DM weight. Green leaves stimulated by lax clipping resulted in the occurrance of more dead leaves in late October. 3. The increase of tiller number, green leaf number, and DM weight of korean lawngrass due to nitrogen application appeared to be of significance in early September. Unlike korean lawngrass, however, this significant increase was maintained to late October when new green leaves still emerge. Clipping height had little effect on the growth of manilagrass by early September, but since then, lax clipping stimulated leaf appearance, possibly resulting in a remained green color of manilagrass turf. 4. Among the stolons outgrown until early September, the primary stolon was not influenced by nitrogen and clipping treatments to produce only 2 - 3 stolons. However, 1st branch stolon as affected by nitrogen increased significantly, so most of stolons which occurred consisted of 1st branch stolon. 5. Until early September, stolon length obtained at nil nitrogen level was chiefly caused by lengthening the primary stolons. By applying nitrogen the primary stolons of korean lawngrass was longer than 1st branch stolons when severe clipping was involved and in turn, shorter than 1st branch stolons when lax clipping was concerned. In manilagrass, 1st branch stolons were much longer than the primary stolons when turf was clipped severely but in conditions of lax clipping, there was little difference in length between primary and 1st branch stolons. 6. Stolon nodes of both korean lawngrass and manilagrass were positively influenced by nitrogen, but no particular increases by imposing clipping height treatment was marked in manilagrass. Although the stolon of korean lawngrass was grown until late october, the growth stimulated by nitrogen was not so remarkable as to exceed that a by nil N. 7. The thickness of korean lawngrass and manilagrass was greatest in late September, but that of manilagrass did not differ significantly from that in late October. 8. The response of stolon length of korean lawngrass to lax clippings was not so great in late October as to that to severe clippings. On the other hand, the positive effect of lax clippings to stolon length in m anilagrass was confirmed even in late October.

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참깨의 개화.등숙에 관한 연구 IV. 적엽처리가 참깨의 등숙에 미치는 영향 (Studies on the Flowering and Maturity in Sesame (Sesamum indicum L.) IV. Effects of Foliage Clipping on the Seed Maturity)

  • 이정일;강철환;손응룡
    • 한국작물학회지
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    • 제30권2호
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    • pp.165-173
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    • 1985
  • 참깨의 초형에 따른 비닐피복과 작기 그리고 적엽시기와 적엽부의별 적엽이 참깨의 동화기관과 종실의 결실.등숙에 미치는 영향을 구명하여 후기등숙불량을 최소화하기 위한 기초자료로 이용코자 일련의 시험을 실시한 결과 다음과 같은 결론을 얻었다. 1. 개화 후 25일 하위엽 적엽에 따른 천립중 변동은 분지형은 단경형보다, 비닐피복구는 무피복 보다, 맥후작은 단작 보다 천립중 감소가 컸다. 단경형 단작 하위적엽에서는 상위삭 천립중이 약간 증가하는 경향을 보였으나 맥후작과 분지형에서는 감소되었다. 2. 하위적엽에 의한 등숙립 비율변동은 분지형은 단경형 보다, 맥후작은 단경 보다 등숙립 비율의 감소가 컸으며 비닐피복 간에는 대차 없었다. 단경단작 25% 적엽에서 상위삭의 등숙립 비율은 무처리대비 약 6%의 증가를 보였으며 맥후작과 분지형에서는 감소되었다. 3. 개화 후 30 일.단경형.하위 25% 적엽에서 무처리에 비하여 약간의 등숙률 증가를 보였으나 분지형에서는 감소되었으며 상위적엽에 의하여 등숙률이 크게 떨어져 이 시기의 동화중심엽은 상위엽으로 추정되었고 단경형보다는 분지형의 하위엽이 등숙후기까지도 엽의 활력을 잘 유지하는 것으로 생각되었다. 개화 후 10 일 적엽구에서는 단경.분지형 공히 큰 폭으로 등숙립 비율이 떨어졌다. 4. 하위 50 % 적엽에서 상위엽의 엽록소 함량은 같은 위치의 무처리 엽에서 보다 39%가 더 증가되었으며 상위 50% 적엽에 의하여 하위엽의 엽록소 함량은 무처리 대비 66%가 증가되어 한 쪽엽 적엽에 의하여 반대에 위치한 엽의 엽록소 함량이 증가하는 보상작용이 인정되었다. 5 하위 50% 적엽에 의하여 광합성은 무처리에 비하여 58 %의 증가를 보였으나 상위 50 % 적엽에서는 Omg$CO_2$/d$m^2$/hr로서 잔존 하위엽에서 생성한 동화양분은 그 엽의 자체의 호흡에 의한 소모도 충족시키지 못하여 생식생장 후기 상위적엽에 의하여 광합성 작용은 치명적 손상을 받을 뿐만 아니라 잔존 하위엽의 광합성 기여도는 낮을 것으로 인정되었다. 6. 수확지수에서는 하위 25% 적엽에 의하여 무처리 대비 28%의 증가를 보인 반면 상위 50% 적엽에서는 무처리에 비하여 13% 감소되었다. 7. 하위 50% 적엽에서 잔존 엽면적은 같은 위치의 무처리엽 면적에 비하여 48 %가 증가되었으나 상위적엽에서는 5% 증가에 그쳐 적엽에 의하여 신생 상위엽의 엽면적 증대는 큰 반면에 노쇠한 하위엽의 엽면적 증대는 거의 없었다. 8. 적엽에 따른 수량차는 분지형이 단경형에서 보다, 맥후작이 단작에서 보다 무처리에 비하여 감수폭이 터 컸으며 비닐피복 간에는 큰 차이를 보이지 않았다. 9. 단경.단작 하위 25 % 적엽에서 비닐피복과 무피복 공히 수량이 무처리에 비하여 각각 5 %와 8 %가 증가하였으며 타 적엽구에서는 감수되었다. 10. 개화 후 10 일 적엽구에서는 무처리에 비하여 34 % 감수된 반면 개화 후 30 일 적엽구에서는 무처리 대비 24 % 감수에 그쳐 개화 후 10일 엽에서의 동화물질 생산 기여도가 개화 후 30 일 엽에서 보다 더 높았던 것으로 인정되었으며 개화 후 10 일에는 단경.분지형 공히 하위 50 % 적엽구에서 가장 많은 감수를 보여 이 시기의 광합성 활동 중심엽은 하위엽인 것으로 추정되었다.

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고구마 경엽절제가 생육 및 수량에 미치는 영향 (Effects of Clipping on Growth and Yield in Sweet Potato)

  • 김익제;손석용;이재웅;유인모;이철희;김태수
    • 한국작물학회지
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    • 제47권3호
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    • pp.143-146
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    • 2002
  • 조기재배 고구마에서 2모작 재배용 묘를 생산하기 위하여 조기재배의 수량감소를 최소화하고, 2모작용 묘를 최대 생산하기 위한 최적 지상부 경엽절제에 대한 시험 결과는 다음과 같았다. 1. 무절제와 비교한 지상부 및 지하부의 생체중과 건물중은 15% 경엽절제 이하에서 수확기에 동일수준이었다. 2. 경엽절제 정도가 많아짐에 따라 지상부 경엽중의 감소는 주만장과 주만절수의 감소가 원인이었다. 3. 총저중이 20% 경엽절제까지 같은 수준이었던 것에 대하여 50g 이상의 상저중은 15% 경엽절제까지 무절제와 비교하여 동일 수준이었던 것은 경엽절제 정도가 많아짐에 따라 50g 이하의 설저의 증가로 상품화율이 감소했기 때문이었다.

미숙아와 신생아의 동맥과 개존증에 대한 수술요법(소개흉 결찰술과 흉강경 보조하의 clipping과의 비교)

  • 장지원;한재진;원용순;원태희;안재호;박영식;최수승
    • Journal of Chest Surgery
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    • 제33권1호
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    • pp.26-31
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    • 2000
  • Background: This study was aimed at analyzing the preoperative conditions post-operative results indication and methods of surgical closure of patent ducturs arterio년 in prematures low birth weight infants and neonates. Patients and Methods: We retro-spectively studied two groups of patients (prematures group and neonates group) who underwent surgical closure of the patent ductus arteriosus between March 1995 and June 1998. Results: The premature group consisted of 9 patients(3 males and 6 females) Their mean gestational period was 30.7 weeks(ranging from 26 weeks to 33 weeks) mean age 27.8 days(11 days to 55 days) and mean body weight 1.56 kg. Prominent preoperative symptoms were dependency on mechanical ventilation generalized edema and hepatomegaly. We performed PDA ligation via thoracotomy in all premature patients. The neonate group consisted of 16 patients and their mean body weight was 3.75 kg. Major symptoms of this group was tachypnea and intercostal retraction resistant to medical treatment. We performed video-assisted PDA clipping to them all. There were no postoperative complications or operation-related mortality in both groups. Comparing the ratio of size of PDA(mm)/body weight(kg) the ratio of premature group (ligation through thoracotomy) was higher than that of neonate group ( video-assisted clipping) that is 3,89:1.21(p=0.03) Conclusion : We conclude that the surgical closure of PDA can be a safe method of treatment for prematures low birth weight infants and neonates with compromised general conditions. Choice of surgical technique depends on the surgeon's preference but there was a tend-ency to choose the ligation method through thoracotomy for patients with small body weight and large PDA.

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이탈리안라이그라스 예취시기가 종자 등숙 및 발아에 미치는 영향 (Effect of Clipping Time on Seed Maturity and Germination in Italian Ryegrass (Lolium multiflorum Lam. Italicum))

  • 서석기;김영두;박호기;박문수
    • 한국작물학회지
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    • 제42권1호
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    • pp.104-111
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    • 1997
  • 이탈리안라이그라스의 청초 이용 및 종자 생산가능성을 검토코자 1986년 10월부터 이듬해 6월까지 Tetrone 등 7품종을 공시하여 예취시기를 각각 4월 10일 예취와 4월 30일 예취 및 무예취로하여 시험을 실시한 결과를 요약하면 다음과 같다. 1. 출수기는 K-11, T.N.T 등 품종이 늦었는데 각 품종 모두 예취시기가 늦을수록 출수기가 지연되고, 천입종은 직선적으로 감소하였다. 2. 입형은 입장, 입폭 및 입후 모두 무예취구에 비하여 예취시기가 늦을수록 작아지는 경향이며, 품종간에는 4배체 품종들이 2배체 품종들 보다 컸다. 3. 최초 발아율 및 발아세는 $25^{\circ}C$에서 15$^{\circ}C$ 보다 높았으며, 최종 발아율은 예취시기가 늦어질수록 낮았는데, 온도간에는 15$^{\circ}C$$25^{\circ}C$보다 다소 높았으며, 품종간에는 출수기가 빨랐던 품종들의 발아율이 높았다. 4. 발아 균일도는 $25^{\circ}C$가 15$^{\circ}C$보다 다소 좋았으며, 예취시기가 늦어질수록 낮아졌는데, 품종간에는 K-11 등 출수기가 빨랐던 것들이 발아가 균일 한 경향이며, 평균 발아일수는 $25^{\circ}C$보다 15$^{\circ}C$에서 길었고, 예취가 늦을수록 길었다. 5. 등숙관련 형질과 발아율 관계는 예취가 늦어질수록 출수가 늦어 발아율은 직선적으로 낮아지고, 천입종이 무거울수록 발아율이 높아지는 경향이었다.

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절엽의 시기 및 정도, 그리고 절엽 후의 시비가 수도의 생육 및 수량제형질의 변화에 미치는 영향 (The Effect of Foliage Clipping on the Growth and the Agronomic Characteristics, as Affected by its Time, Degree, and Nitrogen Top-Dressing, in Rice plants)

  • 이은웅;권용웅;임병기
    • 한국작물학회지
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    • 제4권1호
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    • pp.81-91
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    • 1968
  • 수도품종 "진흥" 공시하여 경엽의 절제 시기 및 정도, 그리고 절제 후의 시비량의 차이가 생육 및 수량형질에 미치는 영향을 알고저 보통기재배조건하에서 최고 분얼기와 그 10일 전후에 무절제구 및 초장의 1/3, 1/2, 2/3절제구에 질소를 10a당 0, 2, 4, 6kg 시용하는 시험을 실시한 바 그 결과는 다음과 같다. 1. 생육에 미치는 영향 : 경엽의 절제구는 절제 후 10 일간에 급속히 생장하며, 대체로 20일 후에는 거의 회복되었다. 1) 절제시기가 늦을수록 생육속도는 빠르며, 유수형성기 전에 절제한 것은 거의 회복되고 조건에 따라서는 무절제구보다 시장하나 유수형성기 이후에 절제한 것은 다소 초장이 작았다. 2) 절제의 정도가 클수록 급속한 신장을 하며, 절제의 정도가 경한 것은 초장이 오히려 증대되었으나 심히 절제한 경우에는 완전한 회복이 이루어지지 않았다. 3) 절제 후의 질소시용은 생육을 촉진하는 효과가 있었으며, 그 정도는 시비량이 많을수록 컸다. 4) 경엽의 절제는 출수를 지연시켰으며, 절제시기가 늦을수록, 절제정도가 클수록, 그리고 절제 후의 질소시용량이 많을수록 그 경향은 뚜렷하였고, 범위는 6일간이었다. 2. 수량형질에 미치는 영향 : 수량은 경엽의 절제에 의하여 대체로 감소되었으나 조건에 따라 변이가 커서, 대조구에 비해 최고 약 25%의 감수 및 10%의 증가를 보였다. 1) 유수형성기 이후의 절제는 간장, 수수, 1수정화수 및 등열율을 감소시키고, 수장 및 유효경비를 다소 증대시켰으며, 수량 및 고중은 약 10% 감소되었다. 2) 경엽의 절제가 경한 경우에는 유효경비가 다소 증대되었으나 1수정화수는 다소 감소되었고 수량 및 고중도 약 4~5% 감소되었다. 그러나 초장의 2/3를 절제하면 수장, 수수 및 1수정화수가 뚜렷이 감소되었고, 수량 및 고중도 약 10% 정도 감소되었다. 3) 절제 후의 질소시용은 10a당 2kg 이하일 경우에 유효하였으며, 4kg 이상의 시용은 간장, 수장, 1수정화수 및 고중을 다소 증대시켰으나 등열율 및 천엽중을 감소시키고 수량은 시용량의 증가에 따라 감소되었다. 따라 감소되었다.

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예초관리에 따른 Kentucky bluegrass의 품종간의 생육과 Thatch 축적 I. 예초잔여물의 제거 하에서의 품종간의 차이 (The Growth and Thatch Accumulation of Kentucky Bluegrasses as Affected by Cutting Management. Varietal Differences under Removing Clipping Residues)

  • 윤용범;이주삼
    • 아시안잔디학회지
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    • 제6권1호
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    • pp.29-37
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    • 1992
  • This experiment was carried out in order to study the changes of morphological characters of the growth and thatch accumulation in :3 varieties of Kentucky bluegrass under removing clipping residues as affected by cutting management. The varieties used were Park, Kenhiuc and Newport.The results obtained are as follows; 1. The dry weight of leaf. stem and number of tiller was highest at 22. June and lowest at 21. Aug in alt varieties. And then the dry weight of rhizome, root and thatch increased with growth progressed) Tabte 3). 2. The relationship of the dry weight of biological yield and number of tillers was quadratic ally increased in the growth stage of spring($R^2$= 0.982**), and linearlly increased in the growth stage of autumn(r 0.944*)(Fig. 1). :3. The dry weight of thatch increased as an exponentially equation in alt :3 varieties of Kentucky blue-grass(Fig. 2). Thatch increased rate(TIR) can used to estimate the specifying a quantity of thatch accumulation from the turf. Thatch increase rate equation as follows. where TH$_2$ is the dry weightof thatch at T$_2$ survey time and TH$_1$ is the dry weight of thatch at $TH_1$ is the dry weight of thatch at $T_1$ survey time. $TIR(mg/cm^2/day)=\frac{Ln\;TH_2 - Ln\; TH_1}{T_2 - T_1}$ 4. Correlation coefficients between the dry weight of thatch and leaf weight was -0.633(P>0.05), and number of tiller of tillers was -0.666(P>0.5), respectively. It means that thatch accumu-lation increased with growth depression of leaf and stem.

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