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Effects of Residue Decomposition on Productivity and Soil Fertility in Rice–Wheat Rotation

^a Dep. of Soils, Punjab Agricultural University, Ludhiana, 141 004, India
^b Crop, Soil, and Water Sciences Division, IRRI DAPO Box 7777, Metro Manila, Philippines

View larger version (15K): [in a new window]   Fig. 1. Monthly distributions (averaged for 15 yr) of (A) maximum and minimum temperatures, (B) sunshine hours, and (C) rainfall at Punjab Agricultural University, Ludhiana, India.

View larger version (13K): [in a new window]   Fig. 2. Effect of decomposition period on the mass remaining of litterbag rice residue. Values of LSD (0.05) for comparing treatment means at each sampling period are 6.9 for 0 d, 4.3 for 35 d, 5.4 for 72 d, 3.9 for 122 d, and NS, nonsignificant for 150 d after wheat planting. Each data point represents mean of three replicates.

View larger version (8K): [in a new window]   Fig. 3. Relationship between N concentration and mass loss of litterbag rice residue. Each data point represents mean of three replicates.

View larger version (12K): [in a new window]   Fig. 4. Relationship between N release and mass loss of litterbag rice residue. Each data point represents mean of three replicates.

View larger version (18K): [in a new window]   Fig. 5. Effect of predecomposition period of rice straw on mineral N (NH4 + NO3) dynamics in soil amended with 100 mg N kg–1 and incubated at 75% field capacity moisture regime at 30°C. Values of LSD (0.05) for comparing treatment means at each sampling period are 5.94 for 10 d, 7.14 for 20 d, 5.46 for 30 d, 4.77 for 45 d and 4.25 for 60 d. Each data point represents mean of three replicates.