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Open AccessArticle

A Comparison of Nitrogen Transfer and Transformation in Traditional Farming and the Rice–Duck Farming System by 15N Tracer Method

1
The Graduate School of Chinese Academy of Agricultural Sciences, Agro-Environmental Protection Institute, No.31 Fukang Road, Nankai District, Tianjin 300191, China
2
Research Base in Anyang Institute of Technology, State Key Laboratory of Cotton Biology/Institute of Cotton Research, Chinese Academy of Agricultural Sciences (ICR, CAAS), Anyang 455000, China
3
School of Physical and Biological Sciences (SPBS), Main Campus, Jaramogi Oginga Odinga University of Science and Technology, P.O. Box 210-40601, Bondo, Kenya
*
Author to whom correspondence should be addressed.
These authors contributed equally to the work.
Agronomy 2018, 8(12), 289; https://doi.org/10.3390/agronomy8120289
Received: 20 September 2018 / Revised: 13 November 2018 / Accepted: 23 November 2018 / Published: 2 December 2018
A field experiment was conducted in Ninghe, Tianjin, China, using the 15N isotope method to determine the fate of N sources, application effect of organic fertilizer on the growth of rice plant organs, N uptake by rice, and N use efficiency. The experiment included eight treatments: CK-N (control + no-duck), CK-D (control + ducks), CF-N (chemical fertilizer + no-ducks), CF-D (chemical fertilizer + ducks), CM-N (chemical fertilizer + organic fertilizer + no-ducks), CM-D (chemical fertilizer + organic fertilizer + ducks), CD-N (chemical fertilizer 30% off + organic fertilizer + no-ducks), and CD-D (chemical fertilizer 30% off + organic fertilizer + ducks). The results showed that the application of organic fertilizer whether CM or CD in grain and leaf significantly increased N concentration; leaf and root P concentrations over control (CK) and chemical fertilizer (CF). In contrast, straw and root N concentrations, including grain and straw P concentrations did not show any difference between duck and no-duck treatment. Moreover, non-significant differences were found in 15N fresh grain and husk concentration. Both organs ranged from 14.2–14.4 g·kg−1 and 6.2–6.3 g·kg−1, respectively. Likewise, N uptake and N use efficiency in fresh grain and husk were not significantly differed within duck and without duck treatment. However, N uptake in fresh grain and husk ranged at the rates of 54.90–93.69 and 6.43–11.04 kg ha−1 with duck and without duck treatment. N use efficiency in fresh grain and husk ranged from 21.55%–34.61% and 2.61%–4.24%, respectively. Overall organic fertilizer has a significant influence on rice growth and promotes crop productivity. View Full-Text
Keywords: nitrogen; transfer; transformation; N uptake; nitrogen use efficiency nitrogen; transfer; transformation; N uptake; nitrogen use efficiency
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EBISSA, T.M.; Yang, B.; Guan, Y.; Tan, B.; Chen, P.; Wang, L.; Magwanga, R.O.; Zheng, X. A Comparison of Nitrogen Transfer and Transformation in Traditional Farming and the Rice–Duck Farming System by 15N Tracer Method. Agronomy 2018, 8, 289.

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