Detection of nitrogen deficiency in wheat from spectral reflectance indices and basic crop eco-physiological concepts

DOI PDF 被引用文献3件
  • D. Rodriguez
    AAgricultural Production Systems Research Unit (APSRU), Department of Primary Industries and Fisheries, PO Box 102, Toowoomba, Qld 4350, Australia.
  • G. J. Fitzgerald
    BUSDA-ARS, U.S. Water Conservation Laboratory, 4331 E. Broadway Rd, Phoenix, AZ 85040, USA.
  • R. Belford
    CPrimary Industries Research Victoria, PO Box 260, Horsham, Vic. 3401, Australia.
  • L. K. Christensen
    DNordic Gene Bank, PO Box 41, SE-23053 Alnarp, Sweden.

書誌事項

公開日
2006-07-14
権利情報
  • https://doi.org/10.1071/journalslicense
DOI
  • 10.1071/ar05361
公開者
CSIRO Publishing

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説明

<jats:p>We tested the capacity of several published multispectral indices to estimate the nitrogen nutrition of wheat canopies grown under different levels of water supply and plant density and derived a simple canopy reflectance index that is greatly independent of those factors. Planar domain geometry was used to account for mixed signals from the canopy and soil when the ground cover was low. A nitrogen stress index was developed, which adjusts shoot %N for plant biomass and area, thereby accounting for environmental conditions that affect growth, such as crop water status. The canopy chlorophyll content index (CCCi) and the modified spectral ratio planar index (mSRPi) could explain 68 and 69% of the observed variability in the nitrogen nutrition of the crop as early as Zadoks 33, irrespective of water status or ground cover. The CCCi was derived from the combination of 3 wavebands 670, 720 and 790 nm, and the mSRPi from 445, 705 and 750 nm, together with broader bands in the NIR and RED. The potential for their spatial application over large fields/paddocks is discussed.</jats:p>

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