Plant analysis to diagnose the nutritional status at the panicle initiation stage of rice cultivar "Menkoina"
2003
Sato, Y.(Akita-ken. Agricultural Experiment Station (Japan)) | Kaneko, J. | Shigeno, T. | Sato, K. | Miura, C. | Taguchi, M. | Miyakawa, H. | Kodama, T.
(1) Plant growth and nitrogen absorption pattern analysis to diagnose the nutritional status of rice cultivar "Menkoina" was carried out for 2 years (1998-2000) at the Akita Agricultural Experiment Station and several demonstration fields in Akita prefecture. (2) Total plant absorbed nitrogen was 12g m2(-1) when yielded up to 660g m2(-1). The evaluated nitrogen absorption was 3.5 g m2(-1), 5.5 m2(-1) and 6.5 g m2(-1) at 9.0, 10.0 and l1.0 of leaf number index respectively. Plant growth types, classified as I, II, III, IV, V-1, V-2 and VI from fertile tiller determination stage to panicle initiation stage, have provided predictive top-dressing nitrogen requirement lodging and water management. (3) Fertile tiller ratio was high when about 30% of total plant nitrogen has been absorbed during fertile tiller determination stage through meiosis stage. In addition, nitrogen absorption from heading to early ripening stage accelerated dry matter accumulation (4) Negative correlation between brown rice protein content and Mido value (Rice Taste Degree Meter, Toyo) , ripened grain percentage or rice production efficiency was observed And brown rice protein content correlated positively with total grain number and chlorophyll meter value on Aug. 20th however, relation with yielding was not observe(L These results indicated that enhancement of ripened grain percentage and rice production efficiency was necessary for optimum content of brown rice protein (5) In 1999, temperature of 20 days after heading was extremely higher than average, and brown rice protein content was higher than that in 2000. (6) We demonstrated that the predictive value of plant growth and nutritional analysis well provided top-dressing nitrogen requirement for optimum grain number and was very useful for the stable rice production with high quality.
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