Abstract
본 시험은 제주지역에서 한지형 잔디의 적정 질소 분시 횟수를 구명하기 위하여 2004년 3월 26일부터 7월 8일까지 질소시비량을 20kg/10a로 고정하고, 15일 간격으로 1회에서 5회까지 분시하여 잔디의 식생변화를 조사하였다. 초장은 4~5회 분시에서 각각 21.8cm, 21.9cm로 가장 길었으나, 시비횟수가 적어짐에 따라 초장은 참아졌다. 근장과 엽록소는 초장반응과 비슷한 경향이었다. 질소 시비횟수가 1회에서 5회로 증가함에 따라 엽중은 1,091kg에서 1,485kg/10a로, 근중은 2,236kg에서 2,808kg/110a로 증가되었다. 질소분시 횟수가 1회에서 5회로증가함에 따라 잔디의 피도는 $96.0\%$에서 $98.4\%$로 증가되었으나, 잡초는 $4.0\%$에서 $1.6\%$로 감소되었다. 잔디의 밀도는 $97.4\%$에서 $98.9\%$로 증가되고 있는 반면, 잡초의 밀도는 $2.6\%$에서 $1.1\%$로 감소되는 경향이었다. 질소분시 횟수가 전량 시비구에서 5회로 증가됨에 따라 침입잡초는 15.7종에서 11.8종으로 감소되었다. 잡초의 우점순위는 전량 시비구에서 쇠비름, 여뀌, 별꽃 순위였으며, 2회 분시에서 쇠비름, 여뀌, 바랭이 순위로, 3회 분시에서 바랭이, 쇠비름, 여뀌 순위로, 4회와 5회 분시에서 쇠비름, 새포아풀, 여뀌 순위였다. 이상의 결과를 종합해 볼 때, 제주지역에서 질소비료를 4회 분시하는 것이 효과적일 것으로 판단된다. This study was conducted from March 21 to July 8 in 2004 at JeJu Island to investigate the influences of split nitrogen application times on creeping bentgrass vegetation. Nitrogen rate was 20 kg/10a and it was applied from once to 5 times. The result obtained were summarized as follows; plant height was getting longer as nitrogen was split applied from once to 5 times. So it was longest at 5 times split nitrogen application, but it was no significance from 4 to 5 times. Root length, Minolta SPAD-502 chlorophyll meter reading value, leave and root weight n[e directly proportional plant height response. Degree of land cover Iud density of creeping bentgrass increased as nitrogen was split applied from once to 5 times. But degree of land cover md density of reed decreased. The number of reed species on decreased as nitrogen was split applied from once to 5 times. Then ranking of the dominant weeds were Portulaca oleracea Polygonum hydropiper and Stellaria media (at once split time nitrogen application), Portulaca oleracea, Polygonum hydropiper and Digitaria adscendens (at 2 split times nitrogen application), Digitaria adscendens and Portulaca oleracea Polygonum hydropiper, (at 3 split times nitrogen application), Portulaca oleracea, Poa annua and Polygonum hydropiper (at 4 md 5 split times nitrogen application). These results indicate that the optimum frequency of split N applications is four times for growth of creeping bentgrass in volcanic ash soils of Jeju island.
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Claims 5
Claim · model-written summary
Plant height of creeping bentgrass increased as nitrogen was split into more applications, from once to five times.
- Taxon
- creeping bentgrass
Agrostis stoloniferae0 - Treatment
- nitrogen was split appliede1
- Outcome
- plant heighte1
- Direction
- getting longere1
- Comparator
- oncee1
- Setting
- JeJu Islande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conducted from March 21 to July 8 in 2004 at JeJu Island to investigate the influences of split nitrogen application times on creeping bentgrass vegetation”
e1“plant height was getting longer as nitrogen was split applied from once to 5 times”
Claim · model-written summary
Density of creeping bentgrass increased as nitrogen was split into more applications.
- Taxon
- creeping bentgrassAgrostis stoloniferae0
- Treatment
- nitrogen was split appliede2
- Outcome
- density of creeping bentgrasse2
- Direction
- increasede2
- Comparator
- oncee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conducted from March 21 to July 8 in 2004 at JeJu Island to investigate the influences of split nitrogen application times on creeping bentgrass vegetation”
e2“density of creeping bentgrass increased as nitrogen was split applied from once to 5 times”
Claim · model-written summary
The number of weed species decreased as nitrogen was split into more applications.
- Taxon
- creeping bentgrassAgrostis stoloniferae0
- Treatment
- nitrogen was split appliede3
- Interactor
- reede3weed
- Outcome
- number of reed speciese3
- Direction
- decreasede3
- Comparator
- oncee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conducted from March 21 to July 8 in 2004 at JeJu Island to investigate the influences of split nitrogen application times on creeping bentgrass vegetation”
e3“The number of reed species on decreased as nitrogen was split applied from once to 5 times”
Claim · model-written summary
Density of weed reed decreased as nitrogen was split into more applications.
- Taxon
- creeping bentgrassAgrostis stoloniferae0
- Treatment
- nitrogen was split appliede3
- Interactor
- reede4weed
- Outcome
- density of reede4
- Direction
- decreasede4
- Comparator
- oncee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conducted from March 21 to July 8 in 2004 at JeJu Island to investigate the influences of split nitrogen application times on creeping bentgrass vegetation”
e3“The number of reed species on decreased as nitrogen was split applied from once to 5 times”
e4“density of reed decreased”
Claim · model-written summary
Four split nitrogen applications is the optimum frequency for creeping bentgrass in Jeju.
- Taxon
- creeping bentgrassAgrostis stoloniferae5
- Outcome
- optimum frequency of split N applicationse5
- Value
- four timese5
- Setting
- volcanic ash soils of Jeju islande5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“These results indicate that the optimum frequency of split N applications is four times for growth of creeping bentgrass in volcanic ash soils of Jeju island”
The same questions in other papers
nitrogen · growth · Agrostis stolonifera (creeping bent grass)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.