On‐farm monitoring of soil and crop nitrogen status by nitrate‐selective electrode

Hartz, T.K.; Smith, Richard; LeStrange, M.; Schulbach, Kurt F.

doi:10.1080/00103629309368981

Cited by 38 publications

(45 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hochmuth (1994) developed sufficiency ranges for NO 3 -in petiole sap for range of vegetable crops. Hartz et al (1993) and Burt et al (1995) provide some guidelines and discussion on NO 3 -sufficiency ranges for root zone soil solution analysis. Granados et al (2007) used a sufficiency range of 8-12 mmol L -1 for NO 3 -in the root-zone soil solution to provide corrective N management to a pepper crop.…”

Section: Discussionmentioning

confidence: 99%

“…A number have been conducted with ion selective electrodes specific to NO 3 -(e.g. Hartz et al, 1993Hartz et al, , 1994Rosen et al, 1996). The media examined have been mostly soil extracts (Jemison and Fox, 1988;Hartz, 1994;Schmidhalter, 2005) or plant sap (Hartz et al, 1993;Hochmuth, 1994;Rosen et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

“…Hartz et al, 1993Hartz et al, , 1994Rosen et al, 1996). The media examined have been mostly soil extracts (Jemison and Fox, 1988;Hartz, 1994;Schmidhalter, 2005) or plant sap (Hartz et al, 1993;Hochmuth, 1994;Rosen et al, 1996). Very few studies have examined NO 3 -in the soil solution, none have done so using colorimetric approaches, and no studies have used colorimetric approaches to examine NO 3 -in the three media of most interest to intensive vegetable production, namely soil solution, plant sap, and applied nutrient solution.…”

Section: Introductionmentioning

confidence: 99%

“…Analysis of NO 3 -concentration in soil solution obtained with ceramic cup suction samplers from the root zone (Hartz et al, 1993;Burt et al, 1995) and in petiole sap Hochmuth, 1994Hochmuth, , 2007Olsen and Lyons, 1994) have been suggested as methods for on-going monitoring of, respectively, the immediately available soil N and crop N status. Recent studies within greenhouse vegetable production systems (Granados et al, , 2007Gallardo et al, 2006) have demonstrated that soil solution nitrate concentration is very sensitive to crop N management.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evaluation of rapid analysis systems for on-farm nitrate analysis in vegetable cropping

Thompson

Gallardo

Joya

et al. 2009

Span. j. agric. res.

View full text Add to dashboard Cite

Small analytical systems enabling rapid on-farm analysis may be useful for monitoring crop and soil nutrient status. Two commercially available, rapid analysis systems were evaluated for analysis of in aqueous standard solutions (AS), and in soil solution (SS), plant sap (PS) and fertigation nutrient solutions (NS) obtained from tomato crops. The systems were the Merck RQFlex reflectometer and the Hanna Instruments C115 Grow Master colorimeter. in AS covered the analytical range of each instrument, being 0.3-3.2 and 0.3-16.1 mmol L -1 , respectively, for the reflectometer and colorimeter. were 5-14 mmol L -1 for SS, 2.3-33 mmol L -1 for NS, and 63-158 mmol L -1 for PS. Accuracy was evaluated using linear regression against (i) known concentration for AS, and (ii) laboratory analysis for SS, PS and NS. For the reflectometer with AS, SS and PS, the linear regression had slopes of 1±0.08 and intercepts of <0.6 mmol L -1 . In NS up to 9 mmol L -1 , there was a similar slope, with an intercept of 1.3 mmol L -1 . In the three most concentrated NS samples, there was a larger relative error that was attributed to faulty dilution. Coefficients of determination were always r 2 ≥0.94. The reflectometer was generally accurate for all media examined; it was rapid (1 min per analysis) and simple to use. The colorimeter was generally similarly accurate; however, it was slower, required reagent preparation and was subject to colour interferences. This work demonstrated that the reflectometer can provide rapid and accurate on-farm measurement of in SS, PS and NS. Additional key words: nutrient management, nutrient solution, plant sap, quick-test, soil solution, tomato. Resumen Evaluación de sistemas rápidos para análisis en campo de nitrato en cultivos hortícolasLos sistemas rápidos que permiten análisis en campo pueden ser útiles para monitorizar el estado nutricional del cultivo y del suelo. Se evaluaron dos sistemas analíticos rápidos para analizar [NO 3 -] en soluciones acuosas (AS), solución del suelo (SS), muestras de savia (PS) y soluciones de fertirriego (NS). Se evaluó el reflectómetro RQFlex de Merck y el colorímetro C115 de Hanna. La [NO 3 -] en AS cubrió el rango analítico de cada instrumento y fue 0.3-3.2 y 0.3-16.1 mmol L -1 , respectivamente, para el reflectómetro y el colorímetro. La [NO 3 -] alcanzó 5-14 mmol L -1 para muestras de SS, 2.3-33 mmol L -1 para NS, y 63-158 mmol L -1 para PS. Para valorar la exactitud de los equipos se usaron regresiones lineales. Para el reflectómetro con muestras de AS, SS y PS, la regresión lineal tuvo pendientes de 1±0.08 e interceptos de <0.6 mmol L -1 . En NS para valores de hasta 9 mmol L -1 , la pendiente fue similar entre equipos, con un intercepto de 1.3 mmol L -1 . En las NS más concentradas, hubo un error relativamente grande que se atribuye a fallos en la dilución. Los r 2 fueron siempre ≥0.94. El reflectómetro fue generalmente preciso en los medios evaluados; fue rápido (1 min/análisis) y simple de usar. El colorímetro tuvo generalmente una exactitud s...

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of rapid analysis systems for on-farm nitrate analysis in vegetable cropping

Thompson

Gallardo

Joya

et al. 2009

Span. j. agric. res.

View full text Add to dashboard Cite

show abstract

“…There is also a lack of interfering ions in soil that complicate an electrode method (Talibudeen, 1991). The Horiba 'Cardy' NO 3 Ϫ meter (Horiba Co., Kyoto, Japan), which is predominately used for sap analysis (Hartz et al, 1993;Westcott et al, 1993;Warncke, 1996;Delgado and Follett, 1998;Westerveld et al, 2004), also can be used for a soil NO 3 Ϫ test. Cardy meter readings for soil NO 3 Ϫ determination were correlated with conventional laboratory results for mineral soil (Hartz et al, 1993).…”

mentioning

confidence: 99%

Assessment of a Nitrate Meter for Nitrogen Tests in Mineral and Organic Soils

Westerveld

McDonald

Scott‐Dupree

et al. 2006

Journal of Vegetable Science

View full text Add to dashboard Cite

ABSTRACT. Nutrient management legislation in Ontario, Canada, has prompted an evaluation of alternative nitrogen (N) management techniques. Rapid, accurate methods of assessing soil nitrogen are required to assist in N management. A portable nitrate (NO 3 Ϫ ) meter (Cardy) was evaluated for use in testing soil N for vegetable crops grown on organic and mineral soils. Cabbage, carrots, and onions were grown on both soils in Ontario, Canada, in 2000 and 2001. Nitrogen was applied at five rates to cabbage and carrots, and three rates to onions ranging from 0 to 200% of current provincial recommended N rates. At three growth stages throughout the growing season, soil samples were collected and subdi-

show abstract

Development of a quick on‐farm test to determine nitrate levels in soil

Schmidhalter

2005

Z. Pflanzenernähr. Bodenk.

View full text Add to dashboard Cite

Crop management can be optimized and nitrogen (N) losses can be reduced with a better knowledge of soil‐nitrogen availability, especially if this information becomes directly available on‐site in a fast and cost‐effective way. In this paper, simple on‐farm methods to determine nitrate‐N in field‐moist soil samples immediately after sampling are described. The procedures include volumetric soil sampling, extraction based on manual shaking with tap water as universally available extractant, filtering soil/extractant mixtures on‐site, on‐site determination of the soil water content, and reflectometric nitrate measurements based on test strips. Using correction factors can compensate the impact of the temperature during the final nitrate measurement. An excellent agreement was found between the developed quick‐test procedures and the standard laboratory procedure. The proposed quick‐test has great potential to enable economical savings for farmers as well as benefiting the environment.

show abstract

On‐farm monitoring of soil and crop nitrogen status by nitrate‐selective electrode

Cited by 38 publications

References 9 publications

Evaluation of rapid analysis systems for on-farm nitrate analysis in vegetable cropping

Evaluation of rapid analysis systems for on-farm nitrate analysis in vegetable cropping

Assessment of a Nitrate Meter for Nitrogen Tests in Mineral and Organic Soils

Development of a quick on‐farm test to determine nitrate levels in soil

Contact Info

Product

Resources

About