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251.

Non-symbiotic bacteria fixes _______ amount of N2 than symbiotic N2 fixers:

A.	Less	B.	More
C.	Equal	D.	Not known

252.

Nutrient index is used to prepare the:

A.	Soil productivity map	B.	Soil fertility map
C.	Both of the above	D.	None of the above

253.

Nutrient absorbed by plants are carried upward through the:

A.	Xylem	B.	Phloem
C.	Both (a) & (b)	D.	None of these

254.

Occurrence of quartz, in high amounts makes a rock:

A.	Hard	B.	Soft
C.	Alkaline	D.	Acidic

255.

Olsen method of P determination is more effective in:

A.	Acidic soil	B.	Alkaline ail
C.	Normal soils	D.	None of these

256.

On the basis of pH measurements, the nearly neutral soils have pH value between:

A.	6.0 to 6.5	B.	6.6 to 7.5
C.	7.5 to 8.5	D.	5.0 to 6.0

257.

On the basis of total mass, the relative abundance of the given elements in the earth's crust is such that:

A.	Si > O2 > Fe = Al	B.	O2 > AI > Sl > Fe
C.	O2 > Si > Fe > Al	D.	O2 > Si > Al > Fe

258.

Organic carbon content in the soil is a measure of:

A.	Available potassium	B.	Available phosphorus
C.	Available nitrogen	D.	Available magnesium

259.

Organic matter contains about ______ percent organic carbon:

A.	32	B.	18
C.	68	D.	58

260.

Organic matter content of 'histosols' and "hydromorphic" soils is:

A.	30-40%	B.	50-57%
C.	60-70%	D.	12 - 18%