After how many days will you supply water to soil in order to ensure sufficient irrigation of the given crop, if (i) Field capacity of the soil = 28% (ii) Permanent wilting point = 13% (iii) Dry density of soil = 1.3 gm/c.c. (iv) Effective depth of root zone = 70 cm (v) Daily consumptive use of water for the given crop = 12 mm.

After how many days will you supply water to soil in order to ensure sufficient irrigation of the given crop, if (i) Field capacity of the soil = 28% (ii) Permanent wilting point = 13% (iii) Dry density of soil = 1.3 gm/c.c. (iv) Effective depth of root zone = 70 cm (v) Daily consumptive use of water for the given crop = 12 mm.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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(a) After how many days will we supply water to the soil in order to insure sufficient irrigation of a crop? If field capacity is 28%, Permanent wilting point 13%, unit weight of soil is 1.3 g/cm³, depth of root zone is 70 cm and daily consumptive use is 12mm.
After how many days will you order irrigation in order to ensure healthy growth of crops, if the field capacity of soil is 29%, PWP is 11%, Density of soil is 1300 kg/m³, Effective RZ is 700 mm, daily Cu is 12 mm. For healthy growth, moisture content must not fall below 25% of the water holding capacity of soil.
Q#2 The moisture holding capacity of the soil in a 100-hectare farm is 18 cm/m, the field is to be irrigated when 50% of t'ne available moisture in the root zone is depleted. The irrigation water is to be supplied by a pump working for 10 hours a day, and water application efficiency is 75%. Details of crops planned for cultivation area are as follows: Root z'one depth (m) Peak rate of moisture use (mm/day) 5 4 Crop X Y Solve for 1) The capacity of irrigation system required, to irrigate crop X in 36 hectares. 2) The area of crop Y that can be irrigated when the available capacity of irrigation is 40 L/s. 1 0.8
The soil moisture at field capacity is 40% (volume basis) and at wilting point it is 16%. Allow ¼ of the total available moisture to be retained in the soil before applying irrigation water. For a 1-m soil depth to be wetted, compute the: A. amount of water to be applied (in cm) if water application efficiency is 80%, B. stream flow required in lps to irrigate 10 hectares in 12 hours, C. number of days for the crop to consume the available moisture before you apply another round of irrigation if rate of water consumption is 8 mm/day.
(b) Calculate the frequency of watering to ensure efficient irrigation for the given crop, if Field capacity of soil = 30 % Permanent wilting point = 12 % Dry density of soil = 15 kN/m Effective depth of root zone = 750 mm Daily consumptive use of water = 10 mm
Q1 During a particular stage of the growth of a crop, consumptive use of water is 3.2 mm/day, and the PWP is 13.6 mm in terms of depth and 17% as a percentage. Find the irrigation frequency and depth of water to be applied, when the amount of water available in the soil is: (i) 10%, (ii) 20% (iii) 45 %, (iv) 80% and (v) 0% of the maximum depth of available water in the root zone. Assume irrigation efficiency to be 75%.
Given the following soil and crop data are provided:• Area to be irrigated = 50000 m2• Soil: medium texture, loam• Crop: Millet with peak daily water use = 6.2mm/day• Soil moisture at field capacity = 30 cm/m• Soil moisture at the permanent wilting point = 15 cm/m• Allowable portion of available moisture permitted for depletion by thecrop before the next irrigation = 50%• RZD = 80 cm• Soil infiltration rate = 5.6 mm/hr• Irrigation efficiency = 75%• Operation time per day: 2 shifts per day operating at 600 minutes pershiftDetermine:Available moisture.Net depth of water application per irrigation.Irrigation frequency. Gross depth of water application.System capacity.
f. Calculate the consumptive use rate of a crop approaching the fruiting period when evaporation is 8 mm/day. If seven days have elapsed since last irrigation how much water has been depleted from the soil? What depth of water should be applied if application efficiency is 50%?
In a cultivated area, the soil has porosity of 45% and field capacity of 38%. For a particular crop, the root zone depth is 1.0 m, the permanent wilting point is 10% and the consumptive use is 15 mm/day. If the irrigation efficiency is 60%, what should be the frequency of irrigation such that the moisture content does not fall below 50% of the maximum available moisture? (a) 5 days (c) 9 days (b) 6 days (d) 11 days
d. Is it true that the lower the soil moisture tension the greater the moisture content? Why? e. Which class of soil water is most important to irrigation? How about the drainage? f. During the hot part of the day you notice some plants start to wilt. What does this indicate?
Irrigation water is to be provided to a crop in a field to bring the moisture content of the soil from the existing 18% to the field capacity of the soil at 28%. The effective root zone of the crop is 70 cm. If the densities of the soil and water are 1.3 g/cm³ and 1.0 g/cm³ respectively, the depth of irrigation water (in mm) required for irrigating the crop is 1. 9.1 2. 8.1 3. 7.1 4. None of the above X
f. Describe the probable root system of a crop which has been applied with frequent, light and widely spaced heavy irrigation. g. What factors affect the scheduling of irrigation water? h. If soil moisture is to be restored to field capacity, how much water should be applied if moisture tension reaches the permanent wilting point? i. Assume that readily available moisture amounts to 150 mm/meter depth of soil profile. If consumptive use rate is 5mm/day what is the irrigation interval for a crop with 30 cm root zone.