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This article in AJ

  1. Vol. 95 No. 4, p. 913-923
     
    Received: July 2, 2002
    Published: July, 2003


    * Corresponding author(s): adobermann2@unl.edu
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doi:10.2134/agronj2003.9130

Soil Fertility and Indigenous Nutrient Supply in Irrigated Rice Domains of Asia

  1. A. Dobermann *a,
  2. C. Witta,
  3. S. Abdulrachmanb,
  4. H. C. Ginesc,
  5. R. Nagarajanh,
  6. T. T. Sond,
  7. P. S. Tane,
  8. G. H. Wangf,
  9. N. V. Chiend,
  10. V. T. K. Thoad,
  11. C. V. Phunge,
  12. P. Staling,
  13. P. Muthukrishnang,
  14. V. Ravih,
  15. M. Babuh,
  16. G. C. Simbahana and
  17. M. A. A. Advientoa
  1. a Int. Rice Res. Inst. (IRRI), DAPO Box 7777, Manila, Philippines
    b Res. Inst. for Rice (RIR), Sukamandi, Indonesia
    c Philippine Rice Res. Inst. (PhilRice), Maligaya, Nueva Ecija, Philippines
    h Soil and Water Manage. Res. Inst. (SWMRI), Thanjavar, Tamil Nadu, India
    d Natl. Inst. for Soils and Fert. (NISF), Hanoi, Vietnam
    e Cuu Long Delta Rice Res. Inst. (CLRRI), Omon, Cantho, Vietnam
    f Zhejiang Univ. (ZU), Hangzhou, P.R. China
    g Tamil Nadu Rice Res. Inst. (TNRRI), Aduthurai, Tamil Nadu, India

Abstract

Knowledge-intensive approaches have been proposed to manage the variability in indigenous nutrient supplies (IS) in irrigated rice (Oryza sativa L.) systems. On-farm experiments were conducted at 155 locations in seven domains of Asia to quantify the variability of soil properties, grain yield, and nutrient uptake in N, P, and K omission plots (0-N, 0-P, and 0-K, respectively). Except for pH, coefficients of variation of soil properties within a domain ranged from 17 to 43%. Similar ranges were measured for grain yield and plant nutrient uptake in nutrient omission plots, which served as crop-based estimates of indigenous N, P, and K supply. Soil properties showed little association with plant nutrient uptake or grain yield in nutrient omission plots. Mean grain yields in nutrient omission plots increased in the order 0-N (3.9 Mg ha−1) < 0-K (5.1 Mg ha−1) ≤ 0-P (5.2 Mg ha−1). Soils, climate, and crop management caused large variability of IS among irrigated rice domains, years, growing seasons, and fields within a domain. Grain yield and nutrient uptake in omission plots were mostly higher in high-yielding than in low-yielding climatic seasons. No changes in indigenous N supply occurred for periods of 4 to 6 yr in the same seasons. Grain yields in nutrient omission plots were strongly correlated with each other and also with the yield in the fertilized farmers' fields. Fertilizer recommendations should be fine-tuned to spatial domains with relatively uniform agroecological characteristics, cropping practices, and socioeconomic conditions. Within such domains, season-specific management of the IS variability can include field-specific approaches.

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Copyright © 2003. American Society of AgronomyPublished in Agron. J.95:913–923.