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EFFECTS OF NH4+–N/NO3−–N RATIOS ON PHOTOSYNTHETIC CHARACTERISTICS, DRY MATTER YIELD AND NITRATE CONCENTRATION OF SPINACH

Published online by Cambridge University Press:  08 August 2014

SUZHI XING ,
JIANFEI WANG ,
YI ZHOU ,
SEAN A. BLOSZIES ,
CONG TU  and
SHUIJIN HU
SUZHI XING
Affiliation:
College of Urban Construction & Environmental Sciences, Anhui Science and Technological University, Fengyang, Anhui 233100, P. R. China
JIANFEI WANG
Affiliation:
College of Urban Construction & Environmental Sciences, Anhui Science and Technological University, Fengyang, Anhui 233100, P. R. China
YI ZHOU
Affiliation:
College of Urban Construction & Environmental Sciences, Anhui Science and Technological University, Fengyang, Anhui 233100, P. R. China
SEAN A. BLOSZIES
Affiliation:
Laboratory of Soil Ecology, Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695-7616, USA
CONG TU*
Affiliation:
Laboratory of Soil Ecology, Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695-7616, USA
SHUIJIN HU
Affiliation:
Laboratory of Soil Ecology, Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695-7616, USA
*
§Corresponding author. Email: cong_tu@ncsu.edu
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Summary

Most plants prefer nitrate (NO3−–N) to ammonium (NH4+–N). However, high NO3−–N in soil and water systems is a cause of concern for human health and the environment. Replacing NO3−–N in plant nutrition regimes with an appropriate amount of NH4+–N may alleviate these concerns. The purpose of this study was to evaluate the effects of different NH4+–N/NO3−–N ratios on chlorophyll content, stomatal conductance, Rubisco activity, net photosynthetic rate, dry matter yield and NO3−–N accumulation in spinach grown hydroponically. The NH4+–N/NO3−–N percentage ratios were 0:100 (control), 25:75, 50:50, 75:25 and 100:0. Chlorophyll a and b, total chlorophyll, stomatal conductance, initial activity and activation state of Rubisco and net photosynthetic rate in spinach leaves were all reduced by increased NH4+–N/NO3−–N ratios. Significant correlation existed between these measurements. However, no statistical differences in dry matter yield were revealed between the 0:100 and 25:75 treatments. Leaf nitrate concentrations were reduced by 38% at the 25:75 treatment relative to the 0:100 treatment. These findings suggest that lowering the relative proportion of NO3−–N in fertilizer could effectively reduce NO3−–N contents in leafy vegetables without decreasing their yields.

Type
Research Article
Information
Experimental Agriculture , Volume 51 , Issue 1 , January 2015 , pp. 151 - 160
Copyright
Copyright © Cambridge University Press 2014 

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