Improvement in ...

same crop is grown on different pieces of land

different crops are grown on different pieces of land

same crop is grown on the same piece of land within a year

different crops are grown on the same piece of land within a year

Jersey and Brown Swiss

Brown Swiss and Red Sindhi

Red Sindhi and Sahiwal

Sahiwal and Jersey

They stay in their hives for very short period of time.

They have high honey collection capacity.

They breed well.

They sting less.

Low maintenance requirement

Tolerance to high temperature

Production of large feathers

Reduced size of the bird

Silver carp

Common carp

Unio

Plants such as guar and sun hemp are used as green manure.

Green manure enriches the soil with hydrogen and oxygen.

Plants such as rose and lantana are used as green manure.

Green manure enriches the soil with zinc and copper.

Fertilizers decrease soil fertility in the long run, whereas long term use of manures does not affect soil fertility.

Fertilizers are made of organic matter, while manures are chemical in nature.

Fertilizers are poor in plant nutrients, while manures contain higher amount of plant nutrients.

Fertilizers increase the water-holding capacity of soil in the long run, whereas long term use of manures does not affect the water-holding capacity of soil.

dug wells

tube wells