- Examples of BioFertilizers:
- Pros and Cons
- Green Manure
- Examples of Green Manure
- Pros and Cons of Green Manure?
What is Biofertilizer?
- Biofertilzier is a substance containing living microorganisms.
- It can be applied to seed, plant surfaces, or soil.
- Biofertilizer improves the supply of primary nutrients like nitrogen, Phosphorous etc. to the host plant, and thereby promotes its growth.
Examples of BioFertilizers are as following:
- blue green algae (BGA)
Biofertilizers: Pros and Cons
- Biofertilizer increases crop yield by 20-30%,
- replaces chemical nitrogen and phosphorus by 25%, and stimulates plant growth.
- It provides protection against drought and certain soil-borne diseases.
- Compared to chemical fertilizers, Bio-fertilizers are quite cost-effective. They have lower manufacturing costs, especially regarding nitrogen and phosphorus use.
- environmentally friendly, cleanse the plant from precipitated chemical fertilizers.
- Their effects are is slower than chemical fertilizer.
- Biofertilizers are sensitive to temperature and humidity changes, hence difficult to store.
- They’ve much lower nutrient density than chemical fertilizers. Farmer would need to use large quantity to get the same yield.
- Some of them need special type of machines for spraying in the farm.
- In rural and remote areas, often it’s hard to find a retailer selling biofertilzers.
- green manure is a type of cover crop, grown to add nutrients and organic matter to the soil.
- Typically, a green manure crop is grown for a specific period of time, and then ploughed under and incorporated into the soil while it is green or shortly after flowering.
- Government of India provides subsidy Subsidy on the purchased of seeds & cost on production of seeds for green manure plants.
Examples of Green Manure plants
|Leguminous plants||Non-leguminous plants|
|Example||Cowpeas, soybeans||sudangrass, millet, sorghum, and buckwheat.|
|Why are they used?||for their nitrogen fixing abilities||for weed suppression and addition of biomass to the soil.|
Pros and Cons of Green Manure?
Green Manure: Advantages
- They improve soil nutrients and protect soil erosion.
- Green manures provide forage for pollinating insects.
- Root systems of many green manure crops to efficiently penetrate compact soils thus increasing the aeration of the soil.
- The deep rooting properties of many green manure crops make them efficient at suppressing weeds
- They fix nitrogen in soil, thus Less chemical fertilizers are required.
- provide habitat for predatory beneficial insects, they kill and eat the pests / harmful insects thus less pesticides are required.
Green Manure: Disadvantage
- These Leguminous plants require good amount of irrigation, hence unsuitable for arid farmers.
- The “time” factor: Farmer cannot plant the primary marketable crop during green manuring phase.