Premium
Effects of Salinity and Mixed Ammonium and Nitrate Nutrition on the Growth and Nitrogen Utilization of Barley
Author(s) -
Ali A.,
Tucker T. C.,
Thompson T. L.,
Salim M.
Publication year - 2001
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1046/j.1439-037x.2001.00471.x
Subject(s) - salinity , dry matter , hordeum vulgare , shoot , ammonium , nitrogen , chemistry , agronomy , nitrate , zoology , horticulture , poaceae , biology , ecology , organic chemistry
The absorption and utilization of nitrogen (N) by plants are affected by salinity and the form of N in the root medium. A hydroponic study was conducted under controlled conditions to investigate growth and N uptake by barley ( Hordeum vulgare L.) supplied with five different NH 4 + ‐N/NO 3 − ‐N ratios at electrical conductivity of 0 and 8 dS m −1 . The five NH 4 + ‐N/NO 3 ‐N ratios were 0/100, 25/75, 50/50, 75/25 and 100/0, each giving a total N supply of 100 mg N l −1 in the root medium. A mixed N supply of NH 4 + and NO 3 − resulted in greater accumulation of N in plants than either NO 3 − or NH 4 + as the sole N source. Plants produced a significantly higher dry matter yield when grown with mixed N nutrition than with NH 4 + or NO 3 − alone. Total dry matter production and root and shoot N contents decreased with increasing salinity in the root medium. The interaction between salinity and N nutrition was found to be significant for all the variables. A significant positive correlation (r=0.97) was found between nitrogen level in the plant shoot and its dry matter yield.