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By Daniel Hillel

And ConclusionsReferences; bankruptcy 6. Root improvement relating to Soil actual stipulations; advent; Root progress; Soil Temperature; Soil Aeration; Soil Water prestige; Soil power; interplay of Root development; Conclusions; References; bankruptcy 7. the sphere Water stability and Water Use potency; the sector Water stability; assessment of the Water stability; Water Use potency; probabilities of regulate; desire for

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After a heavy rain or irriga­ tion the water percolates down to the barrier and then across to its edge. During drainage, a high water content and a high capillary conductivity prevail above the barrier and water can move rapidly to the edge of the barrier. At the edge, similarly, there is a high capillary conductivity because of the perched free water being released. There is also a higher potential gradient which is partially due to gravity. As drainage of the excess water from the barrier proceeds, all of these values decrease.

Simultaneous transfer of heat and moisture in porous media. Trans. Amer. Geophys. Union 39, 909-916. 4. T. (1965). Photosynthesis of leaf canopies. Agr. Res. Rept. 663, 1-57. 5. , and Smith, R. (1955). Mulch­ ing. Commonw. Agr. Bur, Tech. Commun. 49. 6. Lettau, H. (1951). Theory of surface temperature and heat-transfer oscillations near a level ground surface. Trans. Amer. Geophys. Union 32, 189-200. 7. Lettau, H. (1954). Improved models of thermal diffu­ sion in the soil. Trans. Amer. Geophys.

6. 7. 8. 9. 10. Boyko, H. (1968). Farming the desert. Science J. 4^5) 72-78. Cavazza, L. (1969). Agronomic aspects of irrigation with brackish water in southern Italy. In "Value to 11 Agriculture of High-Quality Water for Nuclear Desalina­ tion, pp. 219-224. Int. Atomic Energy Agency, Vienna. D. and Kalisvaart, C. (1967). Subirrigation systems. Tn "Irrigation of Agricultural Lands," pp. 905-921. Agronomy 11, Amer. Soc. , Madison. M. (1968). The influence of sub-surface asphalt barriers on the water properties and productivity of sand soils.

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