+ Site Statistics
+ Resolve Accession
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
Submit PDF Full TextSubmit PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Spectral reflectance of healthy and diseased watermelon citrullus vulgaris leaves

, : Spectral reflectance of healthy and diseased watermelon citrullus vulgaris leaves. Annals of Applied Biology 108(2): 243-250

Significant differences in reflectances were found between healthy and diseased watermelon leaves in the 500-640 nm visible region and 740-900 nm near infrared regions of the electromagnetic spectrum. Spectrophotometric reflectance measurements were made to determine differences between healthy and diseased watermelon (Citrullus vulgaris) leaves over the 500-2700 nm wave length interval. Plants with Fusarium wilt, downy mildew (Pseudoperonspora), and watermelon mosaic were observed during the growing season. Early symptoms of the diseases had significantly greater reflectance values than the advanced stages of the diseases. A ratio of two wavelength bands, 500-640 nm and 660-900 nm gave an accurate index for determining stages of disease, both early and advanced. There were greater differences in reflectance between all three diseases and healthy leaves in both early and advanced stages in the 900-1400 nm, 1500-1900 nm, and 2000-2400 nm middle infra-red wavelengths of the electromagnetic spectrum than in the visible 450-740 nm range. All three diseases had significant differences in the 700-900 nm near-infra-red range.

(PDF 0-2 workdays service)

Order PDF Full Text


Click here to order any other PDF Full Text

Accession: 006459815

PDF Full Text: Submit

Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:

Other references

Spayd, Se; Morris,. Jr.;, 1980: Preliminary study of peroxidase and polyphenoloxidase activity in strawberry fruits. Station Bulletin Agricultural Experiment Station Oregon State University: (645) 171-174

Azzam, S. M.; Nielsen, M. K.; Dickerson, G. E., 1983: Maternal performance over three parities in rats selected for rate or efficiency of protein gain. Direct, maternal and heterosis effects were estimated for preweaning traits over 3 parities, with unstandardised litters, in rats selected for 14 generations for rate (LG line) or efficiency (LE line) of postweaning protein gain. In generation 25,...

Filippchenko V. V., 1937: K litologii otlozheniy nizhnego Silura po trasse Tayshet-Padun. Lithology of the Ordovician deposits in the Taishet-Padun region, eastern Siberia, Russia.

Watine, Joseph, 2007: Guidelines are never perfect; however they need to be transparent. Clinica Chimica Acta 381(2): 184-185

Monterio M.J.; Cox R.A., 1987: Differential expression of an alpha tubulin gene during the development of physarum polycephalum. Febs Letters 217(2): 260-264

Reddy G.S.; Gupta B.M., 1974: Epidemiological studies of leaf spot of mung bean phaseolus aureus caused by alternaria alternata. Labdev Journal of Science & Technology Part B Life Sciences 12(3): 117-118

Feuerstein T.J.; Baer K.I.; Luecking C.H., 1988: Activation of a 1 adenosine receptors decreases the release of serotonin in the rabbit hippocampus but not in the caudate nucleus. The effects of A1 adenosine receptor ligands on the evoked release of serotonin (5-HT) were studied in slices of the hippocampus and the caudate nucleus of the rabbit, preincubated with 3H-5-HT. In hippocampal tissue electrical stimulation elicite...

Bossi, P.; Guihot, A.; Bricaire, F., 2003: Q fever, a potential biowarfare agent. Q fever is a zoonosis due to Coxiella burnetii. Its potential as a biological warfare agent relies on its possible transmission by inhalation of sprayed particles. Inhalation of one to 10 bacteria could lead to the development of an infection in h...

Ross C.A., 1974: Society of economic paleontologists and mineralogists special publication no 21 paleo geographic provinces and provinciality. Society of Economic Paleontologists and Mineralogists Special Publication 233

Corkill G.; Van Housen K.; Hein L.; Reitan J., 1985: Videodensitometric estimation of the protective effect of hyperbaric oxygen in the ischemic gerbil brain. To verify its protective effect on the ischemic mammalian brain, hyperbaric O2 was administered to 6 groups of carotid-ligated gerbils. The outcome was evaluted clinically and by a colorimetric videodensitometry technique by comparing differences...