A student lists the following agricultural practices for crop production:

Irrigation; Removal of weeds; Preparation of soil; Storage of food grains; Sowing; Adding manure and fertilizers

Which agricultural practice is missing from the above list?

Explain how, soil gets affected by the repeated growing of croping the same fields. How does use of fertilizers help the farmers ?

The Rhizobium bacteria present in the root nodules of pea plants can fix one of the following from the atmosphere. This one is:

Which of the following cannot be provided to the soil by a chemical fertilizer?

The plants grow fastest if we add fertilisers in the soil, but if we add manure, plants grow but at a slower rate. Give reason.

Organic foods are harmless. Do you agree?

A farmer was growing only paddy in a particular field for five successive generations. He found that the yield decreases every time. Give reasons and how can this problem be solved?

The use of fertilisers should be limited. Why?

Write two advantages of nitrogen fixation.

A gardener uses manure for better production, what is a manure? Describe the common types of manures. Give the advantages of using them.