Fertilizers, manures and irrigation

Which of the following is not true about tilling?

• it improves air circulation in soil

• it helps in loosening of soil

• it helps to sow the seeds.

• it is also called ploughing

Rhizobium bacteria is present in the nodules of the roots of

• wheat

• leguminous plants

• onion

• maize

Which of the following produces manure?

• cattle dung

• human waste

• plant residue

• all of these

Fertilisers are produced in_________________

• fields

• wells

• factories

• none of these

Which is the best technique for watering fruit plants,gardens and trees?

• Moat system

• Sprinkler system

• Drip system

• Chain pump system

Sprinkler system is very useful for____________

• clayey soil

• red soil

• sandy soil

• clayey loamy soil

Manure is obtained from the __________ of plant or animal wastes.

• combustion

• decomposition

• filtration

• sedimentation

Which of the following is not a fertiliser?

• sludge

• super phosphate

• potash

• ammonium sulphate

A fertiliser is an ________salt.

• organic

• acidic

• alkaline

• inorganic

Farmers grow legumes as fodder in one season and wheat in next season. This helped in the replenishment of the soil with____________

• carbon

• hydrogen

• nitrogen

• nitric acid