2) Barrs, H.D.: Determination of water deficits in plant tissues, in Water deficit and plant growth (ed.) T.T. Kozlowski, Academic Press, New York and London. Vol.1, pp.235-368, 1968.
4) Boyer, J.S.: Leaf water potentials measured with a pressure chamber, Plant Physiol., Vol.42, pp.133-137, 1967.
5) Carlson, R.E., D.N. Yarger and R.H. Shaw: Factors affecting the spectral properties of leaves with special emphasis on leaf water status, Agronomy J., Vol.63, pp.488-489, 1971.