1.-Which of the following can be done to minimize soil and nutrient loss? (Selec

Question

1.-Which of the following can be done to minimize soil and nutrient loss? (Select ALL correct answers)

(a) Till soils

(b) Terracing

(c) Plant cover crops and/or grass contour strips

(d) Plant windbreaks

(e) Harvest complete plants

2.-The rhizosphere around a plant root differs from the bulk soil by which of the following.

(a)The rhizosphere has more CO2.

(b)The rhizosphere has lower levels of organic carbon because of root exudation.

(c)The rhizosphere has more microbial activity.

(d)The rhizosphere has more O2.

(e)All of the above.

3.-For nitrate to form from ammonium, ________ must be present in the soil.

(a)Oxygen

(b)Nitrifying bacteria

(c)Denitrifying bacteria

(d)both A and B

(e)both A and C

(f)none of the above

4.-Industrial N production accounts for approximately ___________ of all (total) N fixation processes.

(a)10%-30%

(b)30%-50%

(c)70%-80%

(d)80%-90%

Explanation / Answer

1. b) Terracing - In this steps are formed by the terraces which are surrounded by a mud wall to prevent run off and hold the soil nutrients in the beds. c)Plant cover crops and/or grass contour strips- It is also called the contour ploughing helps in preventing runoff. d) Plant windbreakers- This prevents wind erosion.

2. e. All of the above.

3. d) both a and B. nitrifying bacteria converts ammonia to nitrates with the help of oxygen.

4. a. 10 - 30% . Industrial nitrogen production accounts for around 62 % of total non biological fixation and around 30 % of total biological fixation.

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