Comparison of growth and15nitrogen recovery between direct seeded flooded and transplanted rice at early growth stage under conventional and delayed planting
Year: 1999
Type: article
Abstract: In the tropics, broadcast seeded flooded rice (BSFR) was found to show a higher 15N 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 15N 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 15N recovery showed a curvilinear relation to the N uptake. Under conventional planting, TPR showed a higher basal 15N 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 15N 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.
Source: Soil Science & Plant Nutrition
Authors: Rodolfo S. Escabarte, Ho Ando, Ken-ichi Kakuda
Institutions: Iwate University, Yamagata University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W1967783000