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Irrigation water having the concentration of Na++, Ca++ and Mg++ as 20, 3 and 1 Milli equivalent per litre respectively will be classified as
Answer & Solution
Correct Answer:
Option
D
Irrigation water is classified based on its sodium concentration relative to the concentrations of calcium and magnesium ions. The classification is determined by the sodium absorption ratio (SAR), which is calculated using the following formula:
SAR = (Na++ / √(Ca++ + Mg++)) * 100
Given the concentrations provided:
Na++ = 20 meq/L
Ca++ = 3 meq/L
Mg++ = 1 meq/L
Plugging these values into the SAR formula:
SAR = (20 / √(3 + 1)) * 100
SAR ≈ (20 / √4) * 100
SAR ≈ (20 / 2) * 100
SAR ≈ 10 * 100
SAR ≈ 1000
According to the classification:
SAR < 10: Low sodium water
10 ≤ SAR < 18: Medium sodium water
18 ≤ SAR < 26: High sodium water
SAR ≥ 26: Very high sodium water
Since the calculated SAR is approximately 100, the irrigation water falls into the category of very high sodium water.
SAR = (Na++ / √(Ca++ + Mg++)) * 100
Given the concentrations provided:
Na++ = 20 meq/L
Ca++ = 3 meq/L
Mg++ = 1 meq/L
Plugging these values into the SAR formula:
SAR = (20 / √(3 + 1)) * 100
SAR ≈ (20 / √4) * 100
SAR ≈ (20 / 2) * 100
SAR ≈ 10 * 100
SAR ≈ 1000
According to the classification:
SAR < 10: Low sodium water
10 ≤ SAR < 18: Medium sodium water
18 ≤ SAR < 26: High sodium water
SAR ≥ 26: Very high sodium water
Since the calculated SAR is approximately 100, the irrigation water falls into the category of very high sodium water.
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LoginNa / ((Sqrt (Mg+Ca)/2))
= 20 / Sqrt((3+1)/2))
= 20/1.414 = 14.14
SAR < 10: Low sodium water
10 ≤ SAR < 18: Medium sodium water
18 ≤ SAR < 26: High sodium water
SAR ≥ 26: Very high sodium water
SAR=14.4(Medium sodium water)
SAR=20/Root of 1+3/2
=20/Root2
=10×Root 2
=14.14 Which is in Medium Sodium Water
So acc. to SAR value 10-18 value comes under medium sodium water
10-18tk medium sodium water
18-26high sodium water
26< very high
0
=14
Sol. 7% per 300m
For 1200m -28%will be increase
So 1.28*1800=2304m
10-18 = medium sodium water
18-26 = high sodium water
>26 = very high sodium water