Soil Science - Page 47 of 50

A. The plant absorbs carbon as carbondioxides directly from the atmosphere.
B. Water is the source of hydrogen
C. Air & water is the source of oxygen & the chief source of soil nitrogen is organic matter & when organic matter decomposes it gives ammonia.
D. All of the above

Maximum fixation of K occurs:……….?

Azotobacter fixes atmospheric nitrogen in the soil by:……….?

What happens when an saline-alkaline soil is reached with water:

Irregular rock masses formed in the pre-existing cracks & crevices are:……….?

Immobile nutrient in soil is:………?

Ammonium sulfate fertilizer containing 21% N & 24% S, is best in top dressing in:………?

From the sources of plant nutrients availability in soil, which of the following statements are correct:

The lower leaves turn yellow and in some crops they quickly start drying up as if suffering from shortage of water, stunted growth, leaves & fruits shedding & whole plant becomes yellow, are deficiency symptoms of:………?

Items needed for synthesis of plant food in green leaves are ……… & the process through which it takes place is called photosynthesis:

Nitrogen & sulphur dioxide liberate from motor vehicles & industries. Nitrogen & Sulphur gases dissolve in the water vapour of atmosphere & form nitric & sulphuric acid. This rain water falls on soil as………. & contaminates soil also:

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