NDLI: Efficient urea-N and KNO$_{3}$-N uptake by vegetable plants using fertigation

Content Provider	Springer Nature Link
Author	Ehaliotis, Constantinos Massas, Ioannis Pavlou, Georgios
Copyright Year	2010
Abstract	Vegetable production demands high nitrogen inputs. Fertigation is a means to increase fertilizer-N use by plants. However, the effect of different N sources and doses, and how they relate to the total available N in soils are poorly known. In this study we applied $_{15}$N-labeled fertilizers to green pepper in the field using a drip irrigation system during the dry summer. KNO$_{3}$-N and urea-N were applied at a total of 6, 12 and 18 g plant$^{−1}$. Our results show that urea was as effective as KNO$_{3}$ as a N source. The fertilizer-N utilization efficiency was dramatically reduced at higher N doses, from 48% for the 6 g N plant$^{−1}$ dose to 36% and 26% for the 12 and 18 g N plant$^{−1}$ doses, respectively. However, the N in plants derived from fertilizer consistently exceeded 60%, indicating high availability of fertilizer-N even at the lowest dose. Negative added nitrogen interactions — the effect of added N on the fate of soil-N — were observed, particularly at high fertilizer-N doses. The fertilizer-N utilization efficiency calculated by the difference method was lower compared with the $^{15}$N enrichment method. This clearly indicates luxury N applications and excess N availability brought about by precise localized placement of fertilizer-N that leads to limited uptake of the available soil-N. N leaching risks in the following rain period should therefore be based on both the residual fertilizer-N and the increased amounts of residual soil mineral-N.
Starting Page	763
Ending Page	768
Page Count	6
File Format	PDF
ISSN	17740746
Journal	Agronomy for Sustainable Development
Volume Number	30
Issue Number	4
e-ISSN	17730155
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-01-01
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Agriculture Soil Science & Conservation Sustainable Development
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Agronomy and Crop Science

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