Comparison of Growth and ^<15>Nitrogen Recovery between Direct Seeded Flooded and Transplanted Rice at Early Growth Stage under Conventional and Delayed Planting

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In the tropics, broadcast seeded flooded rice (BSFR) was found to show a higher ^<15>N recovery than transplanted rice (TPR) under the same fertilizer N management conditions mainly due to the higher initial growth rate at early stages as a result of the lack of transplanting shock. This study was conducted to compare the growth characteristics and ^<15>N recovery at early growth stages between BSFR and TPR under conventional and delayed (low and high temperatures) planting environment in Japan. Under both planting environments, BSFR produced a larger number of tillers m^<-2> (600-700) than TPR (420-450) at the middle growth stage (89 d after seeding, DAS). However, TPR showed a larger crop dry weight accumulation at either planting time resulting in a higher total plant N uptake. Irrespective of the cropping method and time, dry weight was exponentially correlated with the plant uptake while ^<15>N recovery showed a curvilinear relation to the N uptake. Under conventional planting, TPR showed a higher basal ^<15>N recovery (ranging from 23-28%) than BSFR (13-16%) in 1996 while the values were 24-26% for TPR and 14-23% for BSFR in 1997 during the maximum tiller (60-69 DAS) to panicle formation stages (85-89 DAS). Under delayed planting, still TPR showed a higher average basal ^<15>N recovery (28%) than BSFR (23%) at the same stages as those mentioned above. These results suggest that regardless of planting time in Japan, TPR exhibited a higher initial growth rate than BSFR resulting in higher use efficiency of both soil and fertilizer N at the early growth stages.
社団法人日本土壌肥料学会の論文

Comparison of Growth and ^<15>Nitrogen Recovery between Direct Seeded Flooded and Transplanted Rice at Early Growth Stage under Conventional and Delayed Planting

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