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Long-Term Effects of Organic Inputs on Yield and Soil Fertility in the Rice–Wheat Rotation

^a Dep. of Soils, PAU, Ludhiana, 1451 004, India
^b Crop, Soil, and Water Sciences Division, IRRI, DAPO Box 7777, Metro Manila, Philippines

View larger version (13K): [in a new window]   Fig. 1. Yield trends of rice in the long-term experiment, Punjab Agricultural University, Ludhiana, India, 1988 through 1999 with selected treatments. See Table 1 for treatment details and results of linear regression analysis in Table 9.

View larger version (12K): [in a new window]   Fig. 2. Relationship between first year (1988) rice yield and rice yield declines over a 12-yr period for all the treatments.