Yield and Nitrogen Uptake of Wheat (Triticum Aestivum L.) as Affected by Nitrapyrin and a Nitrification Inhibiting Insecticide

Carbon-14 pulse labeling technique was used to study the effect of rooting medium salinity and form and availability of N on growth and rhizodeposition of wheat (Triticum aestivum L.). Thirty days old plants grown in continuously aerated Arnon and Hoagland nutrient solution were subjected to 14 C pulse labeling for 24 h and transferred to aqueous rooting medium containing 0, 150, and 300 mM NaCl in all combinations with different forms (calcium nitrate, ammonium sulphate, and ammonium nitrate) and amounts (0.5, 1.0, 1.5, and 2.0 times the standard N concentration (150 ppm) of Arnon and Hoagland plant growth medium). Plant samples immediately after pulse labeling, following 7 days of growth under different rooting medium conditions, and the freeze-dried rooting medium were analyzed for total C and 14 C. Length and fresh/dry weight of root and shoot portions and calculated values of unaccounted 14 C were determined. Presence of NaCl in the rooting medium led to a decrease in root and shoot portions. However, NO 3 --fed plants showed better growth than NH 4 + -fed plants at all the three salinity levels. Salinity in rooting medium led to higher rhizodeposition and lower loss of 14 C. Relatively higher proportion of 14 C was released as rhizodeposits and retained in root/shoot portions of plants fed with NH 4 + or NH 4 + +NO 3 -, than those with NO 3 -, while less was respired. The specific activity of the rhizodeposits (kBq 14 C g -1 C) was also higher under saline conditions. The rhizodeposits in NH 4 + -fed plants were more highly labeled as compared to NO 3 --plants.

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RETRACTED ARTICLE: Effect of root-zone salinity and form of N on photosynthate partitioning in wheat (Triticum aestivum L.)

Akram

Ashraf

Ahmad

et al. 2008

Acta Physiol Plant

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Erratum to: Effect of root-zone salinity and form of N on photosynthate partitioning in wheat (Triticum aestivum L.)

et al. 2010

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Nitrification Inhibition in Soil and Ecosystem Functioning - An Overview

Azam¹,

Farooq²

2003

Pakistan J. of Biological Sciences

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Yield and Nitrogen Uptake of Wheat (Triticum Aestivum L.) as Affected by Nitrapyrin and a Nitrification Inhibiting Insecticide

Cited by 4 publications

References 22 publications

RETRACTED ARTICLE: Effect of root-zone salinity and form of N on photosynthate partitioning in wheat (Triticum aestivum L.)

RETRACTED ARTICLE: Effect of root-zone salinity and form of N on photosynthate partitioning in wheat (Triticum aestivum L.)

Erratum to: Effect of root-zone salinity and form of N on photosynthate partitioning in wheat (Triticum aestivum L.)

Nitrification Inhibition in Soil and Ecosystem Functioning - An Overview

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