NDLI: Fate of the nitrogen from fertilizers in field-grown maize

Content Provider	Springer Nature Link
Author	Rimski Korsakov, H. Rubio, G. Lavado, R. S.
Copyright Year	2012
Abstract	The nitrogen (N) from fertilizers has different fate, some of which affect the environment or the human health, e.g. nitrates in groundwater. We determined the fate (plant organs, soil organic matter, remaining nitrates and volatilization) of the N applied to field-grown direct drilling maize. An experiment was carried out in a Typic Argiudoll at Chivilcoy, Argentina (35º02′S, 60º06′W). Treatments were: control; 70; 140 and 250 kg N ha−1. Microplots were fertilized with urea tagged with 15N (1.5 % abundance). Plant biomass and N concentration were determined at flowering and at physiological maturity. Soil organic N (0–30 cm) and nitrates and ammoniacal N concentrations (0–300 cm) at harvest, and ammonia volatilization were determined. 15N was determined in all samples. The crop was the main sink, recovering an average of 56 % of the N from the fertilizer. Both the soil organic fraction and ammonia volatilization were the second N sink. The N remaining as residual nitrates averaged 8.6 % and the leached nitrates were only 0.8 % of the fertilizer applied. Most N leached after maize cropping could be accredited to mineralization of organic N. Organic matter could then be a temporary sink, which reduces N leaching from a single fertilization but releases nitrates the following years.
Starting Page	253
Ending Page	263
Page Count	11
File Format	PDF
ISSN	13851314
Journal	Nutrient Cycling in Agroecosystems
Volume Number	93
Issue Number	3
e-ISSN	15730867
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-07-10
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Maize Nitrates Tagged nitrogen Nitrate leaching Organic fractions Volatilization Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science

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