alexa Influence of Nitrogen Limitation and Long-Term Use of R
ISSN: 2376-0354

Journal of Horticulture
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Research Article

Influence of Nitrogen Limitation and Long-Term Use of Rockwool on Nitrous Oxide Emissions in Hydroponic Systems

Shin-nosuke Hashida1*, Kazuyoshi Kitazaki2, Kazuhiro Shoji1, Fumiyuki Goto1 and Toshihiro Yoshihara1
1Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), 1646 Abiko, Chiba 270-1194, Japan
2National Agriculture and Food Research Organization (NARO), Kyushu Okinawa Agricultural Research Center, Japan
Corresponding Author : Shin-nosuke Hashida
PhD, Environmental Science Research Laboratory
Central Research Institute of Electric Power Industry (CRIEPI)
1646 Abiko, Chiba 270-1194, Japan
Tel: +81-4-7182-1181
E-mail: [email protected]
Received April 17, 2014; Accepted November 27, 2014; Published December 1, 2014
Citation: Hashida SN, Kitazaki K, Shoji K, Goto F, Yoshihara T (2014) Influence of Nitrogen Limitation and Long-Term Use of Rockwool on Nitrous Oxide Emissions in Hydroponic Systems. J Horticulture 1:113. doi:10.4172/2376-0354.1000113
Copyright: © 2014 Hashida SN, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

To mitigate Nitrous Oxide (N2O) emissions derived from Nitrogen (N) fertilizer of agroecosystems, establishment of best management protocols for cultivation is necessary. Hydroponic systems using rockwool have the potential to reduce N2O emissions; however, the effects of nutrient condition and retained N compounds in rockwool on N2O emissions remain unclear. The primary objective of our study was to understand the crucial factors behind emissions of N2O. Tomato cultivation with low levels of nutrient showed reduced growth and yield, but increased N2O emission. In contrast, growth and N2O emissions were increased by cultivation with normal levels of nutrient and used (1-yold) rockwool containing excess N compounds from the previous year's cultivation. Though the long-term use of rockwool significantly enhanced seasonal N2O emission, the availability of N2O precursors NO3 − and NH4 + did not clearly explain the variation in N2O fluxes during cultivation. Rather, environmental factors, such as relative water content of rockwool in the rhizosphere, were significantly correlated to N2O emissions during cultivation under various conditions. We conclude that environmental factors most strongly influence the fate of available environmental substrates remaining in rockwool, and thereby control N2O emissions.

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