Tran Thi Thiem 1*, Yamauchi Akira 2. * : Received date: Accepted date:

Transcription

1 Vietnm J.Agri.Sci. 217, Vol. 15, No. 3: T p Vi t Nm 217, t p 15, s 3: Trn Thi Thiem 1*, Ymuchi Akir 2 1 Vietnm Ntionl University of Agriculture 2 Grdute School of Biogriculturl Sciences, Ngoy University Emil * : thiemhu@gmil.com Received dte: Accepted dte: ABSTRACT This study ws conducted to evlute the effects of nitrogen (N) ppliction on root system development, expressed s totl root length, nodl root numer, nodl root length nd lterl root length, in ddition to wter use nd dry mtter production under different soil moisture conditions. The rice plnts of Nipponre, Jpnese rice cultivr, were grown in PVC rootox (25 cm 2 cm 4 cm, L W H) under vinyl house. There were three moisture tretments: continuously wterlogged (CWL) condition nd two wter deficit (WD) conditions s 25% w/w nd 2% w/w. The N fertilizer (ure: 46%N) ws pplied t three different levels: 3, 6 nd 12 mg N rootox -1. Ech level of N fertilizer ws thoroughly mixed with 8 mg phosphorus, 7 mg potssium nd 2.5 kg ir-dried soil per rootox prior to seed sowing. The otined results showed tht incresing the N level from 3 to 6 mg N rootox -1 incresed root system development (s totl root length, nodl root numer, nodl root length, nd lterl root length), wter use, nd shoot dry weight of Nippore under WD conditions (t oth 25 nd 2% w/w of soil moisture content (SMC)), ut there ws no significnt difference in the ove trits etween the 6 to 12 mg N rootox -1 tretments. Under CWL conditions, however, the ove root trits incresed significntly fter incresing the N ppliction from 3 to 12 mg N rootox -1, which led to n increse in wter use, nd eventully significnt increse in dry mtter production. Furthermore, incresing the N ppliction levels incresed wter use through incresed totl root length, which led to the positive nd notly significnt correltion etween the totl root length nd wter use under oth CWL nd WD conditions. Keywords: Dry mtter production, nitrogen, PVC rootox, rice, root system development, wter deficit. n s n c r u ki n thi u n c c ti ng c n s n r c th hi n qu t ng s chi, s r m c t m m c t m c s d ch u ki c tr ng trong h p nh c s n c r u ki m g m m c ng u ki n thi c (WD) ng 3 m i h c tr u v i 8 mg P 2O 5 2 c khi gieo h t. K t qu m cho th u ki n thi c ( c ng r d ng ch u ki i ng r c nhi t qu ch, trong c u ki i ng c, t ng s chi r i qun h thu t m d ng. T B r,, kh ng ch m, thi c. 181

2 Nitrogen ppliction levels ffect root system development of rice under wter deficit conditions () () 182

3 Trn Thi Thiem, Ymuchi Akir 183

4 Nitrogen ppliction levels ffect root system development of rice under wter deficit conditions c c c 3 mg N 6 mg N 12 mg N CWL 25%w/w 2%w/w Soil moisture conditions 184

5 Trn Thi Thiem, Ymuchi Akir 8 6 c 3 mg N 6 mg N 12 mg N 2 CWL 25%w/w 2%w/w Soil moisture conditions 185

6 Nitrogen ppliction levels ffect root system development of rice under wter deficit conditions Soil moisture conditions Nitrogen (mg N rootox -1 ) TRL (cm plnt -1 ) NRN (no. plnt -1 ) NRL (cm plnt -1 ) LRL (cm plnt -1 ) CWL c c c % w/w % w/w SMC ** ** ** ** N ** ** ** ** SMC&N ** ** ** ** 186

7 Trn Thi Thiem, Ymuchi Akir Continously wterlogged condition 8 6 y =.8x r =.88** Totl root length (cm plnt -1) 5 Wter deficit condition t 25% w/w of SMC y =.24x r =.98** Totl root length (cm plnt -1 ) 5 Wter deficit condition t 2% w/w of SMC y =.23x r =.88** Totl root length (cm plnt -1 ) 187

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