Absorption and Partition of 15N-labeled Fertilizer in Rice under Different Nitrogen Application Time and Rate Conditions

다국어 초록 (Multilingual Abstract)

The nitrogen (N) absorption and partition of the rice plants are important indicators that can be used to improve the N use efficiency (NUE) of the plants. Improving the plant NUE can help to avoid nutrient waste that may cause environmental pollution. To investigate the N absorption and partition of the rice plants, Hwaseongbyeo (Japonica) and Dasanbyeo (indica/japonica) were applied with N fertilizers at the rates of 60, 120, and 180 kg N per ha in paddy field. Also micro plots of 0.81m2 were established inside each plot for application of 15N-labeled fertilizer. The differences in N utilization of the rice plants were associated with the total N absorption and partitioning after the heading stage. In the grain filling period, the increase of nitrogen content in the total and leaf blades of Dasanbyeo was higher than that of Hwaseongbyeo. Soil N was the main contributor for the increase of total N of Dasanbyeo during the grain filling period. The N fertilizer uptake rate of Hwaseongbyeo rapidly increased with the increment of N fertilization rate. In Dasanbyeo, N fertilizer uptakes were similar under all rates and times of N application. From heading stage to harvest, Dasanbyeo continued accumulating nitrogen, whereas Hwaseongbyeo had small changes. In conclusion, the difference in nitrogen absorption and partition after heading of the two cultivars was caused by the ability of Dasanbyeo to accumulate and remobilize soil nitrogen to the grains during the grain filling period.

참고문헌 (Reference)

1 Lee, S. H.,, "Variation of Nitrogen Use Efficiency and Its Relationships with Growth Characteristics in Rice Cultivars" 49 (49): 89-93, 2004

2 Hussain, F.,, "Use of chlorophyll meter sufficiency indices for nitrogen management of irrigated rice in Asia" 92 : 875-879, 2000

3 Fischer, K. S., "Toward increasing nutrient use efficiency in rice cropping system the next generation of technology" 56 : 1-6, 1998

4 Michener, "Stable isotopes in ecology and environmental science" 1994

5 Norman, "Seasonal accumulation and partitioning of nitrogen-15 in rice" 1521-1527, 1992

6 Lea, P. J., "Plant nitrogen." Springer. 2001

7 Jo, D. S., "Physiology and ecology in rice plant" 211-212, 1995

8 Cassman, K. G .,, "Nitrogen-use efficiency in tropical lowland rice system contributions from indigenous and applied nitrogen" 47 : 1-12, 1996

9 Mikkelsen, D. S.,, "Nitrogen fertilization practices of lowland rice culture" Nitrogen fertilization in the environment. Marcel Dekker, Inc. 171-223, 1995

10 Novoa, "Loomis" 58 : 177-204, s

11 Peng, S.,, "Increased N-use efficiency using a chlorophyll meter on high-yield irrigated rice" 47 : 243-252, 1996

12 Seo, J. H.,, "Improvement of nitrogen efficiency by N application at early tillering stage in direct-seeded rice" 50 (50): 16-21, 2005

13 Yoshida, "Fundamentals of rice crop science" 1981

14 Lee, J. H, "Food crop I: Rice. Korea" Korea National Open University Press 237-239, 1996

15 Shoji, "Fate of nitrogen in paddy fields and nitrogen absorption by rice plants" 127-134, 1986

16 Lee, J. H.,, "Effects of Urease Inhibitor and Slow-release Fertilizer on Nitrogen Fertilizer Loss in Direct-Seeding Rice" 44 : 230-235, 1999

17 Lee, J. S.,, "Decomposition and 15/N fate of rice straw in paddy soil" 47 (47): 132-136, 2002

18 Wells, "Cultivar and nitrogen rate influence on nitrogen uptake and partitioning in rice" 840-845, 1994

19 Roberts, "Biological yield and harvest index in rice nitrogen response of tall and semidwarf cultivars" 585-588, 1993