By L. P. Smith, A. R. Gemmell, S. McB. Carson and R. W. Colton (Auth.)
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Are the results different from those obtained from drier soil? 3 · Humidity Graphs LIKE temperature and pressure, the relative humidity of the air is continually changing, and the only time it is likely to remain fairly constant is during periods of fog, when it is likely to be nearly 100 per cent the whole time. The best way to represent changes in humidity is therefore on a graph using the time in hours or days as a base-line. 45 Z m c_ °> · L L FIG. 8 \ i* vt / r | r Γ I 1 y f > Q. i 1 • m \ H \ i i£ P K 4 7 / HUMIDITY (%) X 1 î s" ?!
Temp. ^*~"* x _ - - x J y >τ~ —x— — "~ $^-^X--~ □ D D" * 1 9am. 1 1 1 10am. Ham. Noon 1 Ipm. ) FIG. 7 43 T4 ----+ 4in. temp. temp. _n 1 2pm. □ 1 ft. temp. 1 1 3pm. 4pm. 44 W E A T H E R STUDIES 2 It is probable that your first reading will be taken after the time of minimum temperature, but your set of readings should include the maximum. How does the time of maximum temperature vary with depth? Take the difference between the maximum reading and your first reading of the day as an indication of the diurnal range.
42 ASSIGNMENT 14 1 On a sunny day take frequent readings of temperature at the soil surface and as many lower depths as possible, say 2, 4, 8 and 12 in. On a graph showing temperature against time, plot these readings for each depth (see Fig. 7). SOIL TEMPERATURES ON A HOT SUMMER DAY UOh — ££ D / UJ û_ 60 h50 \ \ \ Surface temp. ^_-^-^>· s / 5t* 80, - ·—^ « - —**>. ^ · 7 90 - Z / • /' , · - " / // ^ ' P* 2in. temp. ^*~"* x _ - - x J y >τ~ —x— — "~ $^-^X--~ □ D D" * 1 9am. 1 1 1 10am. Ham. Noon 1 Ipm.