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Characterization of Nitrogen Uptake Pattern in Malaysian Rice MR219 at Different Growth Stages Using 15N Isotope

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Nitrogen (N) use efficiency is usually less than 50%, and it remains a major problem in rice cultivation.
Controlled release fertilizer (CRF) technology is one of the well-known efforts to overcome this problem. The
efficiency of CRF, however, is very much dependent on the timing of nutrient release. This study was
conducted to determine the precise time of N uptake by rice as a guideline to develop efficient CRF. Fertilizer
N uptake by rice at different growth stages was investigated by using 15N isotopic technique. Rice was planted
in pots, with 15N urea as N source at the rate of 120 kg/hm2. Potassium and phosphorus were applied at the
same rate of 50 kg/hm2. Standard agronomic practices were employed throughout the growing periods. Rice
plants were harvested every two weeks until maturation at the 14th week and analyzed for total N and 15N
content. Nitrogen derived from fertilizer was calculated. Total N uptake in plants consistently increased until
the 11th week. After that, it started to plateau and finally declined. Moreover, N utilization by rice plants
peaked at 50%, which occurred during the 11th week after transplanting. N derived from fertilizer in rice plants
were in the range of 18.7% to 40.0% in all plant tissues. The remaining N was derived from soil. Based on this
study, N release from CRF should complete by the 11th week after planting to ensure the maximum fertilizer
N uptake by rice plants. Efficient CRF should contribute to higher N derived from fertilizer which also resulted
in a higher total N uptake by rice plants, increasing the potential of rice to produce higher yield while at the
same time of reducing loss.

Key words: nitrogen use efficiency; rice; controlled release fertilizer; 15N isotope

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Ketersediaan

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Informasi Detail

Judul Seri

Rice Science

No. Panggil

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Penerbit

: Elsevier., 2015

Deskripsi Fisik

Rice Science, 2015, 22(5): 250−254

Bahasa

English

ISBN/ISSN

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Klasifikasi

NONE

Tipe Isi

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Tipe Media

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Tipe Pembawa

-

Edisi

2015, 22(5)

Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/'Agus

Versi lain/terkait

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