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431.

The losses of ammonia usually become greater with:

A.	Increase in soil pH	B.	Decrease in soil pH
C.	Decrease in calcium	D.	Decrease in temperature

432.

The maize crop should be planted at the distance of:

A.	30 x 20-25 cm	B.	60 x 20-25
C.	30 x 10-15	D.	60 x 10-15

433.

Which of the following contains most of the plant nutrients?

A.	Bone meal	B.	Farm yard manure
C.	Urea	D.	Rock phosphate

434.

The major part of nitrogen uptake by the maize is over by the:

A.	Knee high stage	B.	Tasselling stage
C.	Silking stage	D.	Grain filling stage

435.

The maximum carbon dioxide concentration at normal atmospheric levels occurs in relatively low light intensities of ______ foot-candles for some plants:

A.	1500-5000	B.	6000-7500
C.	1000-1000	D.	1150-1450

436.

The maximum phosphorus availability in most of the soils is in the pH range:

A.	4.0-4.5	B.	5.0-5.5
C.	6.0-5.5	D.	7.0-7.5

437.

The mineral calcite develops a negative charge due to _____ tendency for Ca2+ ions than CO32- ions to go into solution:

A.	Lower	B.	Greater
C.	Equal	D.	None of these

438.

The mineralization of organic phosphorus has been studied in relation to _____ ration.

A.	C/N/S	B.	C/N/K
C.	C/N/P	D.	C/N/Ca

439.

The moisture content at which the wilting is complete and the plant die is called:

A.	Permanent wilting	B.	Wilting coefficient
C.	Wilting range	D.	Permanent wilting point

440.

The moisture, which is present in the form of a continuous film outside hygroscopic water around soil particles and microspore spaces is called:

A.	Available moisture	B.	Interspace water
C.	Capillary water	D.	None of these