NDLI: Critical N concentration can vary with growth conditions in forage grasses: implications for plant N status assessment and N deficiency diagnosis

Content Provider	Springer Nature Link
Author	Agnusdei, Mónica G. Assuero, Silvia G. Lattanzi, Fernando A. Mari, María A.
Copyright Year	2010
Abstract	The N nutrition index (NNI, defined as the actual shoot N concentration relative to a reference critical value, Nref) is a valuable tool to analyze the N nutrition status of crops. We present empirical evidence obtained for a range of forage grass species and environmental conditions with the aim to contribute to verify the NNI as a tool to diagnose N deficiency and to examine responses to N fertilization. Ten N fertilization experiments were conducted in the SE of the Pampa region (Argentina) and included (1) perennial (Festuca arundinacea Schreb. Thinoppyron ponticum (Podp.) Barkworth and Dewey) and annual (Lolium multiflorum Lam., Avena sativa L. Bromus catharticus H.B.K.) grasses, (2) autumn, winter and spring regrowths, and (3) good and poor quality soils. Experiments comprised four to six N fertilization rates, each including five to seven sequential harvest dates. Plots were replicated in three or four complete randomized blocks. All experiments were rainfed and adequately provided with phosphorus. The critical N concentration (Ncr) -that is the minimum plant N concentration required to reach maximal accumulated shoot biomass- was determined for each harvest date. Observed Ncr were then compared to values predicted by the general reference curve (Nref) proposed elsewhere. In six of the ten experiments measured Ncr agreed with predicted Nref. Thus, the present study extends to marginal soils, to species adapted to such environment, and to winter growth conditions the empirical support for the use of Nref in the quantification of pasture N deficiency. But Ncr was lower than Nref in four experiments in which growth conditions were not adequate for reaching potential growth rates. Therefore, it is suggested that when factors other than N are expected to limit pasture growth, an Ncr lower than Nref should be considered. In all experiments, a direct relationship between accumulated shoot biomass and NNI was found, radiation use efficiency (RUE) being more negatively affected than photosinthetically active radiation interception (PARi) by N deficiency. Reductions in the latter were relevant only from moderate to severe N deficiency. Notably, the NNI achieved at initial stages of regrowth (150-200°C day after the fertilization date) was highly associated with the N nutritional status along the regrowth and, therefore, confirming NNI as a promising tool for diagnostic purposes.
Starting Page	215
Ending Page	230
Page Count	16
File Format	PDF
ISSN	13851314
Journal	Nutrient Cycling in Agroecosystems
Volume Number	88
Issue Number	2
e-ISSN	15730867
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-02-16
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Critical N concentration N fertilization N nutrition index Forage grasses Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Soil N mineralization in a dairy production system with grass and forage crops

Long-term effects of balanced fertilization on grass forage yield, quality and nutrient uptake, soil organic C and N, and some soil quality characteristics

Nitrogen fertilization and critical nitrogen concentration for contemporary high yielding cotton under no-tillage

Fertilization strategies that reduce emissions of nitrous oxide in forage grasses on farm in the low tropics

How much do water deficits alter the nitrogen nutrition status of forage crops?

Forage production and nitrogen nutrition in three grasses under coconut tree shades in the humid-tropics

Allometric approach to crop nutrition and implications for crop diagnosis and phenotyping. A review

Environmental effect on Epichloë endophyte occurrence and ergovaline concentration in wild populations of forage grasses in Poland

Forage grasses under drought stress in conditions of Poland

Critical N concentration can vary with growth conditions in forage grasses: implications for plant N status assessment and N deficiency diagnosis

Similar Documents

Soil N mineralization in a dairy production system with grass and forage crops

Long-term effects of balanced fertilization on grass forage yield, quality and nutrient uptake, soil organic C and N, and some soil quality characteristics

Nitrogen fertilization and critical nitrogen concentration for contemporary high yielding cotton under no-tillage

Fertilization strategies that reduce emissions of nitrous oxide in forage grasses on farm in the low tropics

How much do water deficits alter the nitrogen nutrition status of forage crops?

Forage production and nitrogen nutrition in three grasses under coconut tree shades in the humid-tropics

Allometric approach to crop nutrition and implications for crop diagnosis and phenotyping. A review

Environmental effect on Epichloë endophyte occurrence and ergovaline concentration in wild populations of forage grasses in Poland

Forage grasses under drought stress in conditions of Poland

Critical N concentration can vary with growth conditions in forage grasses: implications for plant N status assessment and N deficiency diagnosis