Agriculture - Mock Test 48

Question 471

The cation, which competes with ammonium during fixation, is?

A) Potassium B) Aluminium C) Magnesium D) None of the above

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Question 472

The carbon nitrogen ratio in cultivated soil is stabilized as?

A) 20:1 to 30:1 B) 4:1 to 9:1 C) 18:1 to 19:1 D) 8:1 to 15:1

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Question 473

The capacity of soils to be moulded, that is to change shape in response to stress and peep that shape when stress is removed is termed as?

A) Plasticity B) Stickiness C) Consistency D) Cementation

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Question 474

The C:N ratio in the organic matter of the furrow slice (upper 15 cm) of arable soils commonly ranges from?

A) 3:1 to 4:1 B) 6:1 to 7:1 C) 18:1 to 19:1 D) 8:1 to 15:1

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Question 475

The C E C of mica is about?

A) 10 m.e./100 g B) 100 m.e./100 g C) 50 m.e./100 g D) 140 m.e./100 g

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Question 476

The C E C of illite is about?

A) 100 m.e./100 g B) 140 m.e./100 g C) 40 m.e./100 g D) 10 m.e./100 g

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Question 477

Which one of the following concentrated organic manures has maximum P2O5 content?

A) Fish meal B) Stera meat C) Poultry manure D) Guano

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Question 478

The biological method for determining defidency of lime, P and K is?

A) Neubauers method B) Aspergillus niger test C) Azotobacter plaque test D) None of the above

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Question 479

The best estimate of the available P in phosphatic fertilizers is obtained from the?

A) Water soluble fraction B) Citrate insoluble fraction C) Citrate soluble fraction D) Water soluble and citrate soluble fraction

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Question 480

The bacteria responsible for fixation of nitrogen in soyabean are?

A) Rhyzobium lguminoserum B) Rhyzobium phaseoil C) Rhyzobium glycicum D) Rhyzobium japonicum

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