Why are cyanobacteria considered useful in paddy fields ?
Why are cyanobacteria considered useful in paddy fields ?
Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environments many of which can fix atmospheric nitrogen(they contain heterocyst) e.g. Anabaena, Nostoc, Oscillatoria, etc. In paddy fields, cyanobacteria serve as an important biofertiliser and increases yield by $50 \%$. Blue green algae also add organic matter to the soil and increase its fertility.
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Azolla enriches rice fields with nitrogen due to its association with
Azolla enriches rice fields with nitrogen due to its association with
Mycorrhiza is helpful in
Mycorrhiza is helpful in
Farmers have reported over $50\%$ higher yields of rice by using which of the following biofertilizer
Farmers have reported over $50\%$ higher yields of rice by using which of the following biofertilizer
- [AIPMT 1999]
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?
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?
Which of the following plants is used as biofertiliser
Which of the following plants is used as biofertiliser