31.
Which mineral substance placed at number 10 in Mohs scale

32.
Approximate specific gravity of H2SO4 (AR grade) is

33.
The most widely used source of nitrogen in agriculture in India is

34.
If the contents of exchangeable ions (cmol kg-1) determined in soil are Na+ = 5, K+ = 5, Ca2+ = 10, Mg2+ = 2, H+ = 1, Al+3 = 1, Cl- = 1.6 and HCO-3 =0.4, the CEC of soil is

35.
The nutrient concentration range in which added nutrient will not increase yield but can increase nutrient concentration is referred as

36.
Bray has modified the mitscherlich equation to

37.
A soil profile is a vertical section of soil having depth

38.
Urea-form contains N in % is

39.
In the case of Zn deficiency of paddy, how much zinc sulphate should be applied in one hectare of soil.

40.
Which fertilizer has risk of fire or even explosion

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