737 
also be due to the 
re another set of 
it content of a leaf 
; leaf that is joined 
vestigation will be 
ents and different 
n to exist between 
ilar water/nutrient 
:nts in at least one 
ate the amount of 
tudying the effects 
the "antagonistic" 
it may affect the 
im and/or calcium 
ponding change in 
am and/or calcium 
effects of nutrient 
es, to measure the 
i experiments are 
m, potassium and 
» as to assess the 
repeated at several 
hnique under sub- 
. have to be used 
rements have been 
ts including water, 
it content of a leaf 
lar to Cohen, 1991 
6. REFERENCES 
1. J.B.Schutt. R.R. Rowland and W.H.Hearth. 1984. A Laboratory' Investigation of a Physical Mechanism for the 
Extended Infrared Absorption ('Red Shift 1 ) in Wheat. International Journal of Remote Sensing, vol. 5, No. 1:95- 
102 . 
2. E.Knipling. 1970. Physical and Physiological Basis for the Reflectance of Visible and Near Infrared Radiation 
from Vegetation. Remote Sensing of the Environment, vol. 1:155-159. 
3. D.M. Gates, HJ.Keegan, J.C.Schleter and V.R.Weidner. 1965. Spectral Properties of Plants. Applied Optics, 
vol. 4, No 1:11-20. 
4. D.N.H.Horler, J.Barber and A.R_Bamnger, 1980. Effects of Heavy Metals on the Absorbance and Reflectance 
Spectra of Plants. International Journal of Remote Sensing, vol. 1, No. 2:121-136. 
5. J.E.Colewell. 1974. Vegetation Canopy Reflectance. Remote Sensing of the Environment, vol. 3:175-183. 
6. HW.Gausman. D.E.Escobar. R.R. Rodriguez. W.A.Allen and R-Cardenas. 1971. Age Effect of Cotton Leaves 
on Light Reflectance. Transmittance and Absorptance and on Water Content and Thickness. Agronomy Journal, 
vol. 63:465-469. 
7. R E.Carlson. D.N.Yarger and R.H.Shaw. 1971. Factors affecting the Spectral Properties of Leaves with Special 
Emphasis on Leaf Water Status. Agronomy Journal, vol. 63:486-489. 
8. J.R. Thomas. L.N.Namken . G.F.Oerther and R_G.Brown. 1971. Estimating Leaf Water Content by' Reflectance 
Measurements. Agronomy Journal, vol. 63:845-847. 
9. T.RSinclair. R_M.Hoffer and M.M.Schreiber. 1971. Reflectance and Internal Structure of Leaves from Several 
Crops During the Growing Season. Agronomy Journal, vol. 63:864-868. 
10. J.R.Thomas and G.F.Oerther. (1972). Estimating Nitrogen Content of Sweet Pepper Leaves by' Reflectance 
Measurements. Agronomy Journal., vol. 64:11-13 
11. AH Al-Abbas. R.Barr. J.D.Hall, F.L.Crane and M.F.Baumgrardner. 1974. Spectra of Normal and Deficient 
Maize Leaves. Agronomy Journal, vol. 66:16-20. 
12. R_E.Hunt and B.N.Rock. 1989. Detection of Changes in Leaf Water Content using Near and Middle Infrared 
Reflectance's. Remote Sensing of the Environment vol. 30:43-54. 
13. H W.Gausman. 1977. Reflectance of Leaf Components. Remote Sensing of the Environment, vol. 6:1-9. 
14. H.W. Gausman 1974. Leaf Reflectance of Near Infrared. Photogrammetric Engineering and Remote Sensing, 
1974. ppl83-191. 
15. MJ.Bamsley. 1984. Effects of off-Nadir View' Angles on the Detected Spectral Response of Vegetation 
Canopies. International Journal of Remote Sensing, vol. 5, No. 4:715-728. 
16. R.D.Jackson and C.E.Ezra. 1985. Spectral Response of Cotton to Suddenly Induced Water Stress. 
International Journal of Remote Sensing, vol. 6, No. 1:177-185. 
17. G.G. Wright. 1986. Some Observ ations of the Effect of Wind Turbulence on Near Lnfirared/Red Ratio. 
International Journal of Remote Sensing, vol. 7, No. 1:173-178. 
18. ARHuete. RD.Jackson and D.F Post. 1985. Spectral Response of a Plant Canopy with Different Soil 
Backgrounds. Remote Sensing of the Environment vol. 17:37-53. 
19. D.D.Egbert and F.T.Ulaby. 1972. Effect of Angles on Reflectivity . Photogrammetric Engineering and Remote 
Sensing, vol. 38, pp556-564. 
20. S.ABowers and RJ.Hanks. 1964. Reflection of Radiant Energy from Soils. Soil Science, vol. 100, No 2:130- 
138. 
21. L.Grant. 1987. Diffuse and Specular Characteristics of Leaf Reflectance. Remote Sensing of the Environment, 
vol. 22:309-322. 
22. S.Moran. P. J.Pinter, B.E.Clothier and S.G. Allen. 1989. Effect of Water Stress on the Canopy Architecture 
and Spectral Indices of Irrigated Alfalfa. Remote Sensing of the Environment vol. 29:251-261. 
23. B.N.Holben. J.B.Schutt and J.McMurtrey. 1983. Leaf Water Stress detection utilising Thematic Mapper 
Bands 3,4 & 5 in Soybean Plants. International Journal of Remote Sensing, vol. 4, No. 2:289-297. 
24 H.D. Williamson. 1988. Soil Influences on Vegetation Reflectance of a Semi-Arid Shrub land. Proceedings of 
IGARSS '88 Symposium. Edinburgh. Scotland. 13-16 Sept. 1988. pp837-840. 
25. E.A Waiter-Shea. J.M.Norman and B.L.Blad. 1989. Leaf Bi-directional Reflectance and Transmittance in 
Com and Soybean. Remote Sensing of the Environment vol. 29:161-174. 
26. T.W.Brakke. J.A_Smith and J.M.Hamden. 1989. Bidirectional Scattering of Light from Tree Leaves. Remote 
Sensing of the Environment vol. 29:175-183. 
27 J.T. Woolley. 1971. Reflectance and Transmittance of Light by' Leaves. Plant Physiology, vol. 47: 656-662.