tailieunhanh - Effects of nitrogen forms on root system development, physiological traits, and dry matter production of rice

The objectives of this study were to evaluate the effects of nitrogen forms on root system development (expressed as total root length, nodal root number, nodal root length, and lateral root length), water use, photosynthetic rate, and dry matter production under water deficit (WD) at 20% w/w and continuously waterlogged (CWL) conditions. | Vietnam Journal of Agricultural Sciences ISSN 2588-1299 VJAS 2018; 1(1): 1-10 Effects of Nitrogen Forms on Root System Development, Physiological Traits, and Dry Matter Production of Rice Tran Thi Thiem1 and Yamauchi Akira2 1 Vietnam National University of Agriculture, Hanoi 131000, Vietnam; Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan 2 Abstract Received: October 16, 2017 Accepted: January 25, 2018 Correspondence to tranthiem@ ORCID Thiem Tran The objectives of this study were to evaluate the effects of nitrogen forms on root system development (expressed as total root length, nodal root number, nodal root length, and lateral root length), water use, photosynthetic rate, and dry matter production under water deficit (WD) at 20% w/w and continuously waterlogged (CWL) conditions. Rice plants cv. Nipponbare were grown in plastic pots in a vinyl house. Six N forms were applied at the same rate of 360 mg N per pot, and were prepared as follows: N-NH4+ alone (A); NNH4+ with nitrification inhibitor (A+DCD); N-NO3- alone (N); NNO3- with nitrification inhibitor (N+DCD); combined N-NH4+ and N-NO3- (AN); and combined N-NH4+ and N-NO3- with nitrification inhibitor (AN+DCD). The nitrification inhibitor, dicyandiamide (DCD) (C2H4N4), was applied at the rate of 100 mg pot-1. The results of the experiment showed that under both WD and CWL conditions, significant increases were seen in the root system development as expressed through total root length, nodal root number, nodal root length, and lateral root length in the N-NO3treatments with and without DCD compared to the application of NNH4+ treatments with and without DCD. This led to an increase in water use, and eventually a significant increase in dry matter production. Similarly, the A treatments with and without DCD also significantly increased root system .

• Sinh học
• Vietnam journal of agricultural sciences
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• physiological traits
• Dry matter production of rice
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• Nodal root length
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