Semi-detailed Soil Survey of the LIuidas Vale Area, St. Catherine-St ...

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DESCRIPTION OF THE SURVEY AREA
J F M A M J J A S O N O (Montiw) -
PET: Potential Evapo-Transpiration (mm)
R50: Median monthly rainfall (mm)
R75: Monthly rainfall (mm) reached or exceeded in 75% of the years
Fig. 2. Rainfall-PET histogram for Worthy Park.
The rainfall-PET histogram for Worthy Park shows that the "rainy season",
the time period in which the 75%-dependable rainfall (R75) exceeds 0.3xPET,
extends from the end of April till the beginning of January. In order to allow
for satisfactory growth of (most) annual crops, temperature should not be
limiting and "water supply" should exceed 0.5xPET: this period is known as
the dependable growing period. It is defined as the period in which R75/PET
ranges from 0.5-10 (Moist months, see Table 2), i.e. May to August and
November, and exceeds 1.0 (Humid months, see Table 2), i.e. October, plus a
final period in which remaining soil water can be depleted towards the end
of the rainy season (December). The latter period of soil water use (u) has
been set at 1 month, provided 0.3