• Title/Summary/Keyword: Topdressing

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Effects of Rubber Chips from Used Tires on Spots Turf Ground as Soil Conditioner (Rubber chip의 경기장 지반 물리성 개선과 잔디 생육에 미치는 효과)

  • ;;;David Minner
    • Asian Journal of Turfgrass Science
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    • v.16 no.1
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    • pp.19-30
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    • 2002

  • This study was conducted to investigated the effects of rubber chips from used tires on sports turf ground as soil conditioner to improve soil physical properties. The release of heavy metal ions was detected to check the soil contamination by incorporation of recycled rubber chips with topsoil. The effects of the chips were also evaluated as topdressing material to improve surface resilience. The rate of rubber chips showed a positive relationship with soil temperature increasement. Incorporation of rubber chips increased soil temperature on surface at 2.5 cm-depth. The rates of rubber chip showed a negative relationship with ground cover rate of turfgrass in early growth season. However, after 20 weeks, treatment of 10% rubber chips at 2.5 cm-depth showed a prominent cover rate of 70% which was not significantly different with untreated control. Incorporation of rubber chips within topsoil seemed to reduce soil compaction, but the effects was not prominent on physical properties. Rubber chips did not affect chemical properties and heavy metal contamination to soil environment. Rubber chips improved resilience of the compacted ground surface as topdressing material, this effect was prominent when aerification practise was preceded.

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Development and Preliminary Test of a Prototype Program to Recommend Nitrogen Topdressing Rate Using Color Digital Camera Image Analysis at Panicle Initiation Stage of Rice (디지털 카메라 칼라영상 분석을 이용한 벼 질소 수비량 추천 원시 프로그램의 개발과 예비 적용성 검토)

  • Chi, Jeong-Hyun;Lee, Jae-Hong;Choi, Byoung-Rourl;Han, Sang-Wook;Kim, Soon-Jae;Park, Kyeong-Yeol;Lee, Kyu-Jong;Lee, Byun-Woo
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.55 no.4
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    • pp.312-318
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    • 2010

  • This study was carried out to develop and test a prototype program that recommends the nitrogen topdressing rate using the color digital camera image taken from rice field at panicle initiation stage (PIS). This program comprises four models to estimate shoot N content (PNup) by color digital image analysis, shoot N accumulation from PIS to maturity (PHNup), yield, and protein content of rice. The models were formulated using data set from N rate experiments in 2008. PNup was found to be estimated by non-linear regression model using canopy cover and normalized green values calculated from color digital image analysis as predictor variables. PHNup could be predicted by quadratic regression model from PNup and N fertilization rate at panicle initiation stage with $R^2$ of 0.923. Yield and protein content of rice could also be predicted by quadratic regression models using PNup and PHNup as predictor variables with $R^2$ of 0.859 and 0.804, respectively. The performance of the program integrating the above models to recommend N topdressing rate at PIS was field-tested in 2009. N topdressing rate prescribed for the target protein content of 6.0% by the program were lower by about 30% compared to the fixed rate of 30% that is recommended conventionally as the split application rate of N fertilizer at PIS, while rice yield in the plots top-dressed with the prescribed N rate were not different from those of the plots top-dressed with the fixed N rates of 30% and showed a little lower or similar protein content of rice as well. And coefficients of variation in rice yield and quality parameters were reduced substantially by the prescribed N topdressing. These results indicate that the N rate recommendation using the analysis of color digital camera image is promising to be applied for precise management of N fertilization. However, for the universal and practical application the component models of the program are needed to be improved so as to be applicable to the diverse edaphic and climatic condition.

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Winterkill and Strategy of Golf Course Management: A Review (동절기 피해의 이해와 겨울철 골프장 관리: 리뷰)

  • Lee, Sang-Kook
    • Asian Journal of Turfgrass Science
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    • v.25 no.2
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    • pp.133-137
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    • 2011

  • Winterkill can be defined as any injury including freeze stress kill, winter desiccation, and low temperature disease to turfgrass plants that occurs during the winter period. The major damages from winterkill were low temperature kill, crown hydration, and winter desiccation. Low temperature kill is caused by air and soil temperature. Soil temperature affect more severe to turfgrass than air temperature because low soil temperature cause fetal damage to turfgrass crown. Crown hydration is a form of winter injury in which intercellular water within the plant freezes and causes physical injury to the cell membrane and wall. This is eventually resulted in dehydration of cell. Winter desiccation is the death of leaves or whole plants due to drought during the winter period. To reduce winterkill damage, cultivar selection is very important. If changing cultivar is not allowed, cold temperature hardiness needs to be increased by providing nutrients especially phosphorus and potassium in the late fall. Turf cover is effective way to reduce winterkill damage. Remaining snow is positive process to reduce winterkill damage by insulating soil temperature. The previous researches reported many materials as turf cover such as straw, polypropylene, polyester, and wood mat. Aeration and topdressing is one of the process against winterkill. Both methods are mainly conducted to reduce thickness of thatch layer. In recent, relatively new materials called black or winter topdressing sand are used to protect soil temperature from low air temperature and thaw ice crystal that may remain in soil.

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Establishment Technology of Leaves and Stems Dressing with Bermudagrass 'Konwoo' (버뮤다 그래스 신품종 ‘건우’의 LSD(Leaves and Stems Dressing = 잎줄기 드레싱) 시공기술)

  • 이재필;권영주;김석정;서한용;이상재;정종일;한인송;김두환
    • Asian Journal of Turfgrass Science
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    • v.15 no.3
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    • pp.137-146
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    • 2001

  • Stolen and rhizome are used as planting material fur sod production in hybrid types of bermudagrass. The new technology of Leaves and Stems Dressing (LSD) uses leaves and stems collected from mowing for sod production and turf establishment. The procedure of Leaf and Stem Dressing is as follows; 1) Collection of leaves and stems of bermudagrass using rotary mower with bucket. 2) Preparation of turf bed. 3) Dressing of leaves and stems of bermudagrass by man power or spray machine. 4) first irrigation. 5) Topdressing with sand or rotary with tractor. 6) Final irrigation.

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