Root nodules for nitrogen fixation of a non-leguminous tree possess

Crop rotation is carried out for

Mycorrhiza is helpful in

Most famous nitrogen fixing bacterium/biofertilizer is

Consider the following statements about organic farming

$I.$ Organic farming promotes the use of crop rotations and cover crops and encourages balanced host/predator relationships

$II.$ Integrated pest and weed management and soil conservation systems are valuable tools on an organic farm

$III.$ Organic farming protects the environment, minimize soil degradation and erosion and decrease pollution

Which of the statements given above are correct?