Growth and Phosphorus Uptake of Oat (Avena nuda L.) as Affected by Mineral Nitrogen Forms Supplied in Hydroponics and Soil Culture

Ming Shou FAN, Zhen LI, Feng Mei WANG, Jianhua ZHANG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Plants show different growth responses to N sources supplied with either NH+4 or NO-3. The uptake of different N sources also affects the rhizosphere pH and therefore the bioavailability of soil phosphorus, particularly in alkaline soils. The plant growth, P uptake, and P availability in the rhizosphere of oat (Avena nuda L.) grown in hydroponics and in soil culture were investigated under supply with sole NH+4 -N, sole NO-3-N, or a combination. Sole NO-3-fed oat plants accumulated more biomass than sole NH+4 -fed ones. The highest biomass accumulation was observed when N was supplied with both NH+4 -N and NO-3-N. Growth of the plant root increased with the proportion of NO-3in the cultural medium. Better root growth and higher root/shoot ratio were consistently observed in NO-3-fed plants. However, root vigor was the highest when N was supplied with NO-3+NH+4. NH+4 supply reduced the rhizosphere pH but did not affect P uptake by plants grown in soils with CaHPO4 added as P source. No P deficiency was observed, and plant P concentrations were generally above 2 g kg-1. P uptake was increased when N was supplied partly or solely as NO-3-N, similarly as biomass accumulation. The results suggested that oat was an NO-3-preferring plant, and NO-3-N was essential for plant growth and the maintenance of root absorption capacity. N supply with NH+4-N did not improve P nutrition, which was most likely due to the absence of P deficiency.

Original languageEnglish
Pages (from-to)323-330
Number of pages8
JournalPedosphere
Volume19
Issue number3
DOIs
Publication statusPublished - Jun 2009

Scopus Subject Areas

  • Soil Science

User-Defined Keywords

  • alkaline soils
  • nitrogen nutrition
  • oat (Avena nuda L.)
  • P uptake
  • rhizosphere pH

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