Agriculture - Mock Test 65

Question 641

In the P-determination by Olsen method, the ration of soil and extractant should be?

A) 1;20 B) 1;100 C) 1;10 D) 1;50

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Question 642

In the diffusion, the movement of ions takes place?

A) From the region of higher concentration to the lower concentration B) From the region of lower concentration to the higher concentration C) Both are correct D) None of the above

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Question 643

In the C:N ration of crop residues is more than 30, then?

A) Immobilization will take place B) Mineralization will take place C) Partial mineralization will take place D) All of these

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Question 644

In soil where the negative charge is pH dependent, liming Increase CEC which results in an increase potassium by the soil colloids and ______ in soil?

A) Increases B) Decreases C) Little effect D) None of these

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Question 645

In respect of a sugarcane crop to be grown in an acidic soil having high P-fixing capacity by the fertilizer of choice would be?

A) Triple super phosphate B) Finely ground rock phosphate C) Coarse rock phosphate D) Super phosphate

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Question 646

In order to asses the immediately fertility level of a given soil for K, which one of the following forms of K present in soil would one test for?

A) Total K B) Exchangeable K C) Water soluble K D) K held in the silt

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Question 647

In no-tillage systems, the surface soil layers have?

A) Higher bulk density B) Lower bulk density C) Higher Total pore space D) Lower water infiltration

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Question 648

Which one of the following statements is correct?

A) Rhizobia fix N2 in soil non-symbiotically B) Azotobacters fix N2 symbiotically C) BGA fix N2 in paddy fields under submerged condition D) Closterdia fix N2 symbiotically

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Question 649

In high P-fixing soils, water soluble P2O5-fertilizers are applied to the crops essentially as?

A) Broadcast B) Placement below the seed C) Placement above the seed D) Top dressing

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Question 650

In general, waters with conductivity values below ______ mmhos/cm are satisfactory for irrigation in so far as salt content in concerned?

A) 1250 B) 1150 C) 950 D) 750

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