The amylose content of rice is considered as another main
parameter of cooking and eating qualities (Juliano 1972).
Amylose content influences many starch properties, volume
expansion, and the water absorption of rice (Juliano 1979).
There are few studies to verify the benefits of VRF manage-
ment based on soil testing and rice growth diagnosis to produce
uniform high quality rice at the farm scale. Recent research con-
ducted in other countries (Angus et al. 1990; Dobermann et al.
2002; Wang et al. 2001; Wopereis et al. 1999) has demonstrated
limitations of the current approach of fixed-rate, fixed-time fer-
tilizer recommendations for large areas. This approach does not
take into account the existence of large variability in soil nutri-
ent supply and crop response to nutrients among, or even within,
farms. The specific objectives of this research were to quantify
the reduction in the variability of rice yield and yield compo-
nents, and improvements in rice quality in experiments conduct-
ed on 60 individual (45 VRF and 15 FPM) fields.
The amylose content of rice is considered as another main
parameter of cooking and eating qualities (Juliano 1972).
Amylose content influences many starch properties, volume
expansion, and the water absorption of rice (Juliano 1979).
There are few studies to verify the benefits of VRF manage-
ment based on soil testing and rice growth diagnosis to produce
uniform high quality rice at the farm scale. Recent research con-
ducted in other countries (Angus et al. 1990; Dobermann et al.
2002; Wang et al. 2001; Wopereis et al. 1999) has demonstrated
limitations of the current approach of fixed-rate, fixed-time fer-
tilizer recommendations for large areas. This approach does not
take into account the existence of large variability in soil nutri-
ent supply and crop response to nutrients among, or even within,
farms. The specific objectives of this research were to quantify
the reduction in the variability of rice yield and yield compo-
nents, and improvements in rice quality in experiments conduct-
ed on 60 individual (45 VRF and 15 FPM) fields.
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