Agronomy

Nutrients has some physiological function in metabolism of plant

Plants can not complete their life cycle in absence of that element

Deficiency symptoms can be removed by application of that putrid

All the above

Succession

Biodiversity

Retrogression

Linear planting

Above 10

Above 6

Below 6

None of these

Ammonia

Methane

Ethane

CO2

Aeration

Photosynthesis

Nitrogen fixation

Respiration

Mixed crops

Cover crops

Companion crops

Ratooning crops

Eruci form

campo deiform

Vermiform

Scarabaeiform

Maguire (1962)

Kittock and Law (1969)

Woodstock (1976)

Nicolls and Heu Decker (1968)

5-15%

10-20%

20-50%

20-60%

Rigidity of body parts

Prevent evaporation

impermeability of water

Toughness and flexibility