Question

A crop is being tested in the lab to its loss due to transpiration. Given that initial weight of instrument is 100 kgs, and final mass of instrument is 150 kgs. The amount of water added during full growth of plant is 70 kgs. Find the loss due transpiration when the method used is phytometer method?

(a) 20 kgs

(b) 15 kgs

(c) 25 kgs

(d) 10 kgs

This question was posed to me in examination.

Question is taken from Water Requirements of Crops topic in section Water Requirements of Crops of Irrigation Engineering

Answer 1

Correct option is (a) 20 kgs

To explain: When phytometer method is used the formula for transpiration loss (T)

= (M1 + M) – (M2)

M1 = initial mass of instrument

M = mass of water added during full growth of plant

M2 = final mass of instrument

Therefore (T) = (100 + 70) – 150 = 170 – 150 = 20 kgs.