By E. J. Winter (auth.)
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Additional resources for Water, Soil and the Plant
Schofield, R. K. (1935). The pF of the water in soil. Trans. 3rd into Congr. , 37-48. 40 Water, Soil and the Plant SOIL MOISTURE CHARACTERISTIC A similar curve describes matric suction in relation to soil moisture content and is known as Child's moisture characteristic, or characteristic moisture release curve. When, as is often the case, osmotic suction is negligible, the pF curve and the moisture characteristic curve are virtually identical but as pointed out above there are important exceptions to this.
The advantage of the 15 bar moisture content is that it is a precisely defined physical entity, entirely independent of variable living material. 5 shows the variable behaviour of sunflower. THE UPPER CAPACITY') LIMIT OF AVAILABLE WATER ('FIELD It has been pointed out that saturated soil is in an unstable state; water is pulled down by gravity augmented by the suction exerted by lower unsaturated zones. ;h soil particle and hence the greater the surface tension and suction. • ~ c• - 4·0 ! et Ul 30 et I!
5 shows the variable behaviour of sunflower. THE UPPER CAPACITY') LIMIT OF AVAILABLE WATER ('FIELD It has been pointed out that saturated soil is in an unstable state; water is pulled down by gravity augmented by the suction exerted by lower unsaturated zones. ;h soil particle and hence the greater the surface tension and suction. • ~ c• - 4·0 ! et Ul 30 et I! • ~ 'i ! J W Q - 3·0 Ul ! c ~ "8 ~::1 ; :S 1 -= • ! 5 Wilting behaviour of sUrlflower in silty clay loam and in loam. Each symbol represents the range of wilting points corresponding to the number of individuals indicated alongside.