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28
Jan

Distribution of problem soils in India cropped to rice

While the diversity in agro ecological environment in the country provide opportunities for growing  numerous commercially viable cropping and farming systems towards a robust agriculture, efficient and sustainable management of natural resources especially soil and water for enhanced soil productivity is vital for over all economy of the country.  Although soil productivity depends largely on a number of its diverse physico - chemi
28
Jan

Soil and management related constraints

Soil and management related constraints in rice production in India can be delineated in following points:
  • Increasing area under soil salinization (8-10 M ha) (salt affected) - major portion is cropped to rice,
  • About 15 M.ha of rice soils are acidic associated with toxicity of Fe, Al, Mn, As, deficiency of K, Ca, Mg, B, Si, and P fixation,
  • About  8.0 M.ha of rice area is deficient in zinc (Zn)
  • Nearly
28
Jan

Loss of soil organic carbon (SOC)

  •  In India SOC content is most of the soils range from 0.2 to 0.5% (2-5 g/kg soil) which works out to 21 and 156 billion tons up to 30 and 150 cm soil depth, respectively while total soil inorganic C pool (SIC) is about 196 billion tons. 
  • Loss of SOC is alarming due increasing atmospheric temperature and changing rainfall pattern.
28
Jan

Soil affected due to water erosion

  • About 149 M.ha is affected due to water erosion, 13.5 M.ha by wind erosion, 14.0 M.ha by chemical degradation and about 12 M.ha by physical degradation (Yadav, 2007). 
  • Loss of fertile top soil by water erosion  is about 5000 M.tons per year of which about 29% is lost into sea, 10% deposited in reservoirs, 59
28
Jan

Estimated area (M ha) affected with Soil Physical Constraints

 Estimated area (M ha) affected with Soil Physical Constraints
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