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Published online 1 May 2008
Published in Soil Sci Soc Am J 72:775-785 (2008)
DOI: 10.2136/sssaj2006.0378
© 2008 Soil Science Society of America
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Organic Amendments Influence Soil Organic Carbon Pools and Rice–Wheat Productivity

Bidisha Majumdera,*, Biswapati Mandalb, P. K. Bandyopadhyayb, A. Gangopadhyaya, P. K. Manib, A. L. Kundub and D. Mazumdarc

a Jadavpur Univ., Kolkata, West Bengal 700 032, India
b Directorate of Research, Bidhan Chandra Krishi Viswavidyalaya, Kalyani, West Bengal 741 235, India
c Dep. of Agril. Statistics, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, West Bengal 741 252, India


Figure 1
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  		Fig. 1. Combined (rice and wheat) grain yield of the rice–wheat cropping system under different treatments (1986–2004): NPK, inorganic N–P–K fertilizer; GM, green manure; PS, paddy straw; FYM, farmyard manure.

 

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  		Fig. 2. Combined (rice and wheat) amount of crop residue (stubble, roots, and rhizodeposition) returned to the soil under different treatments in the rice–wheat cropping system (1986–2004): NPK, inorganic N–P–K fertilizer; GM, green manure; PS, paddy straw; FYM, farmyard manure.

 

Figure 3
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  		Fig. 3. Relationship between cumulative C inputs to soil and change in soil organic C (SOC) stock (critical C input value derived for zero change) under different treatments in the rice–wheat cropping system (error bars represent the standard error of means of change in SOC).

 




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