Sensor-based Technology for Assessing Drought Stress in Two Warm-Season Turfgrasses

난지형 잔디의 건조 스트레스를 측정하기 위한 센서 기술 연구

  • Published : 2006.12.30

Abstract

This study was designed to determine what sensor-based technologies might reliably and accurately predict irrigation scheduling needs of warm-season turfgrass. 'Floratam' St. Augustinegrass[Stenotaphrum secundatum(Walt.) Kuntze] and 'Sea Isle I' seashore paspalum(Paspalum vaginatum Swartz) were established in tubs in the Envirotron Turfgrass Research Laboratory in Gainesville, FL in the spring of 2002. Each grass was subjected to repeated dry-down cycles where irrigation was withheld. Sensor-based data were collected and these evaluations were used to determine if irrigation scheduling could be determined based on plant response during dry-down. Results indicated that reflectance indices($P{\le}0.001$) and soil moisture($P{\le}0.0001$) throughout the dry-down cycle can predict the need for irrigation scheduling as turf quality declined below acceptable levels.

본 연구는 토양 수분함량을 즉시 파악할 수 있는 Time Domain Radiometer(TDR)과 식물의 광합성 시 잎에서 반사되는 Reflectance를 통하여 식물의 상태를 파악할 수 있는 Multi-spectral radiometer(MSR)를 사용하여 난지형 잔디인 'Sea Isle 1' Seashore paspalum 과 'Floratam' St. Augustinegrass를 대상으로 토양수분함량과 Reflectance와의 상관관계를 파악하고자 시작하였다. 본 연구를 통해 토양 수분함량이 660, 694 wavelengths와 NDVI, LAI, stress index에서 높은 상관관계를 가지고 있음을 알 수 있었다. 이는 Sensor-based technology가 잔디의 수분요구 시점을 미리 파악할 수 있는 기술의 기초 자료로서 활용될 수 있으며 여러 다른 Sensor-based technology를 이용한 연구로 확대될 수 있을 것이다.

Keywords

References

  1. Carrow, R.N. 1996. Drought resistance aspects of turfgrasses in the southeast: Root‐shoot responses. Crop Sci. 36: 687‐694
  2. Carter, G.A. 1991. Primary and secondary effects of water content on the spectral  reflectance of leaves. Am. J. Botany 78: 916‐924
  3. Carter, G.A. 1993. Responses of leaf spectral reflectance to plant stress. Am. J. Botany 80(3): 239‐243
  4. Carter, G.A. 1994. Ratios of leaf reflectances in narrow wavebands as indicators of plant stress. Int. J. Remote Sensing 15(3): 697‐703
  5. Carter, G.A. and R.L. Miller. 1994. Early detection of plant stress by digital imaging within narrow stress‐sensitive wavebands. Remote Sens. Environ 50: 295‐302
  6. Carter, G.A. 1996. Narrow‐band reflectance imagery compared with thermal imagery for early detection of plant stress. J. Plant Physiol 148: 515‐522
  7. Cibula, W.G. and G.A. Carter. 1992. Identification of a far‐red reflectance response to ectomycorrhizae in slash pine. Int. J. Remote Sensing 13: 925‐932
  8. Duncan, R.R. 1994. Seashore paspalum may be grass for the year 2000. Southern Turf Mgt. 5: 31‐32
  9. Huang, B., R.R. Duncan, and R.N. Carrow. 1997. Drought resistance mechanisms of seven warm‐season turfgrasses under surface soil drying:  II. Root aspects. Crop Sci. 37: 1863‐1869
  10. Kneebone, W.R., D.M. Kopec, and C.F. Mancino. 1992. Water requirements and irrigation. Turfgrass ‐ Agron. Mono. 32: 442
  11. Knipling, E.B. 1970. Physical and physiological basis for the reflectance of visible and near‐infrared radiation from vegetation. Remote Sens. Environ. 1: 155‐159
  12. Sifers, S.I. and J.B. Beard. 1999. Drought resistance in warm‐season grasses. Golf Course Mgt. 67: 67‐70
  13. Trenholm, L.E., R.N. Carrow, and R.R. Duncan. 1999a. Wear tolerance, shoot      performance, and spectral reflectance of seashore paspalum and bermudagrass. Crop Sci. 39: 1147‐1152
  14. Trenholm, L.E., R.N. Carrow, and R.R. Duncan. 1999b. Relationship of multispectral radiometry data to qualitative data in turfgrass research. Crop Sci.  39: 763‐769
  15. Trenholm, L.E., R.R. Duncan, R.N. Carrow, and G.H. Snyder. 2001. Influence of silica on growth, quality, and wear tolerance of seashore paspalum. J. Plant Nutrition 24(2): 245‐259
  16. White, R.H., M.C. Engelke, S.J. Morton, and B.A. Ruemmele. 1992. Competitive turgor maintenance in tall fescue. Crop Sci. 32: 251‐256
  17. White, R.H., A.H. Bruneau, and T.J. Cowett. 1993. Drought resistance of diverse tall fescue cultivars. Int. Turfgrass Soc. Res. J. 7: 607‐613