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Performance of Site-Specific Nutrient Management for Irrigated Rice in Southeast China

^a College of Environ. and Nat. Resources Sci., Zhejiang Univ., Huajiachi, Hangzhou 310029, P.R. China
^b Dep. of Agron. and Hortic., Univ. of Nebraska, P.O. Box 830915, Lincoln, NE 68583-0915
^c Int. Rice Res. Inst. (IRRI), DAPO, Box 7777, Metro Manila, Philippines
^d Agric. Res. Stn., Jinhua, Zhejiang, P.R. China
^e Agric. Technol. Ext. Stn., Jinhua, Zhejiang, P.R. China

View larger version (31K): [in a new window]   Fig. 1. Trends of rice production, area, yield, and total fertilizer consumption in Zhejiang Province, China. Yield trends shown are averages of two rice crops per year. Annual rates of yield and production changes were estimated from a piece-wise linear regression. (Data source: annual statistical yearbooks of Zhejiang Province, Zhejiang Statistical Bureau, Beijing, China.)

View larger version (46K): [in a new window]   Fig. 2. Climatic conditions at Jinhua, Zhejiang Province, China during 1997 to 1999. Sunshine hours and temperature data are 9-d moving averages; rainfall is monthly total.

View larger version (24K): [in a new window]   Fig. 3. Fertilizer N applications in the farmers' fertilizer practice (FFP) and site-specific nutrient management (SSNM) plots during 1999 early (ER) and late (LR) rice crops.

View larger version (22K): [in a new window]   Fig. 4. Difference between chlorophyll meter readings (SPAD) in site-specific nutrient management (SSNM) and farmers' fertilizer practice (FFP) during early vegetative growth and late reproductive growth. Values shown are for the 1999 early (ER) and late (LR) rice crops.

View larger version (25K): [in a new window]   Fig. 5. Difference in total fertilizer cost (TFC) and gross return above fertilizer cost (GRF) between the farmers' fertilizer practice (FFP) and site-specific nutrient management (SSNM) in 21 rice farms at Jinhua, China during early rice (ER) and late rice (LR) crops in 1998 and 1999 (means ± standard error). The P values shown indicate the probability of a significant mean difference in GRF between FFP and SSNM in each season.