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(25 pts) The average root depth of the cotton which will be planted in the field is 80 cm. Borehole samples obtained from field exploration in the area showed that available water holding capacities are determined as; 0 - 25 cm 28% 25-60 cm 23% 60 - 120 cm 20% a) If the Readily available water (RAW) is 0.75 of the total available water and cotton roots are 80 cm deep, what depth of water is available for the cotton use between irrigations. b) Detailed moisture content determination analysis of borehole sample obtained from the field revealed that soil water content is varied according to the values given in the table below. (y vs. 0). Using the moisture values given in the table, determine the value available water (AW) and RAW for the 100 cm rooting depth of cotton. Also determine the value of usable water for cotton and corresponding water potential at this value. w(bar) -0.33 -0.6 -1.0 -2.0 -4.0 -7.0 -10.0 -15.0 0 (% vol) 0.29 0.22 0.20 0.15 0.13 0.12 0.11 0.055 c) If the roots of cotton are developed according to the conventional root zone distribution pattern, determine the values of RAW for the root zones, and determine irrigation frequency if the daily consumptive use is 10 mm/day