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Yield and Soil Nutrient Changes in a Long-Term Rice-Wheat Rotation in India

^a Dep. of Agronomy, Punjab Agricultural Univ., Ludhiana, India
^b Crop, Soil, and Water Science Division, International Rice Research Institute (IRRI), DAPO 7777, Metro Manila, Philippines
^c Social Sciences Division, International Rice Research Institute (IRRI), DAPO 7777, Metro Manila, Philippines
^d Rice-Wheat Consortium for Indo-Gangetic Plains, NASC Complex, Pusa, New Delhi 110 012, India

View larger version (25K): [in a new window]   Fig. 1. Yield trends of rice and wheat in the long-term experiment, Punjab Agriculture University, Ludhiana, India, 1984 through 1997 with selected treatments. See Table 1 for treatment details and results of linear regression analyses.

View larger version (15K): [in a new window]   Fig. 2. Relationship between initial (1984) rice yield and rice yield decline over a 14-yr period for all treatments except the unfertilized control.

View larger version (23K): [in a new window]   Fig. 3. Response of rice and wheat yields to N-P-K application during the initial (1984–1986) and final 3 yr (1995–1997). *Represents slope significantly different from 0 at P < 0.05. See Table 1 for treatment details.

View larger version (21K): [in a new window]   Fig. 4. Trends of total C, N, and C/N in a long-term experiment, Punjab Agriculture University, Ludhiana, India, 1988–97. *, ** Represents significant at P < 0.05 and P < 0.01, respectively. Total C and total N of T6 were higher and those of T1 were lower than in other treatments, while there was no difference in C/N among the other treatments. See Table 1 for treatment details.