Weather and Agriculture by James A. Taylor (Eds.)

By James A. Taylor (Eds.)

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Again the concepts of field capacity and wilting point in relation to soil moisture conditions are well known and need no further emphasis. The phenomenon of frost-heaving has already been discussed at a previous symposium (Edwards, 1958). This constitutes a special manifestation of soil climate which in heavy-textured soils can be very critical to the plant. The major factors of soil climate may be listed as follows: (a) nature and depth of parent material in relation to heat conductivity and water-holding capacity, (b) depth of the soil itself and of weathered material, if any, below it, (c) the texture of the soil itself and of its different horizons, (d) the structure of the soil itself and of its horizons, (e) degree of roughness of the soil surface, (f) colour of the soil surface, (g) degree of wetness or dryness of the soil surface, (h) nature, morphology and 44 JAM!

M. T. for selected periods in 1954-5 (Pen Dinas investigation). m. T. for a period of about 14 months. Unfortunately, it was impossible to take uninterrupted readings at all stations. Only at station "North" was it possible to have continuous data, thanks to the co­ operation of the local farmer. At other stations it was only during term time when students were available that readings could be taken. Figure 8(c) shows sets of tautochrones for Shaw Week means for all depths at all four stations for the periods 13 October-10 December 1954; 15 January18 March 1955; 23 April-1 July 1955; and 1 October-9 December 1955.

A B 0-0025 0-0036 0-0049 0-0064 0-0081 0-0100 1-4 2-8 5-7 8-9 18 1-3 2-6 5-3 8-0 16 1-2 2-4 4-8 7-0 14 hours 2-2 4-5 9-0 14-0 28 7 11 22 45 112 224 2-0 4-0 8-0 12-0 24 6 9 19 37 93 186 1-7 3-5 7-0 10-0 20 days 5 8 16 32 80 160 5 7 14 28 70 140 4 6 12 25 62 124 4 6 11 22 56 112 54 P. B. SARSON illustrated in Tables 1 and 2 which are confined to the two most important temperature oscillations, the diurnal and annual variations. The amplitude of any oscillation decreases exponentially with depth: and the shorter the period of oscillation the more rapidly it decreases.

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