Question

How to measure field capacity of soil with method refrence?

Answer 1

Field method as suggested by Francesco Danuso is more appropriate for undisturbed soils under field condition. However,  in pot trial, you will also determine the FC of disturbed soil as follows.

Take a pot that you will use in experiment. Cover surfaces of pot by thin plastic film with proving several holes at bottom of pot to drain free water (soil particles must not remove with drain water). Take a known quantity of soil in pot. Saturate the pot soil for several hours with excess water (hence, all micro pores will filled up by water) and cover the top of pot to avoid evaporation. When the gravitational water will seizes (probable overnight), weigh net weight of moist soil. Calculate the amount of water held by soil i.e. 100 % FC. Subsequent calculate Water held at 80 and 90 % of FC. Further, looking your treatment, you might miss MWHC treatment in-between continuous flooding and 100 % FC.

Answer 2

India is the second most populated country in the world and this huge populated country's main profession is agriculture.

So every perspective of agriculture is equally important to the Indian annual economy,as agriculture is the main profession of the India.

Field capacity is the moisture amount of the soil after drainage of the excess water.

Method reference is one of the most significant field capacity measuring method in the laboratory.