Comparison of methods for determination of nitrogen levels in soil, plant and body tissues, and water

Lee, Daryl; Nguyen, Vu L.; Littlefield, S.

doi:10.1080/00103629609369595

Cited by 24 publications

(15 citation statements)

References 3 publications

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“…Laurel, NJ). Total N measurements were based on the Dumas Method (Lee et al, 1996) using a Nitrogen Analyzer (FP-528; LECO Corp, St. Joseph, MI). Soil pH was measured in 0.005 M CaCl 2 using a 1:1 soil:solution ratio.…”

Section: Soilsmentioning

confidence: 99%

Pesticide sorption and leaching potential on three Hawaiian soils

Hall

Ray

et al. 2015

Journal of Environmental Management

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Section: Soilsmentioning

confidence: 99%

Pesticide sorption and leaching potential on three Hawaiian soils

Hall

Ray

et al. 2015

Journal of Environmental Management

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“…Grass and forb samples harvested from two of the four quadrats within each treatment plot in 1999 were randomly selected and ground through a 1-mm screen using a Wiley mill and analyzed for total N using a LECO FP-428 nitrogen determinator (Lee et al 1996), which was then converted to crude protein (CP) by multiplying by 6.25. Herbage yield and quality data were also combined to assess changes in overall crude protein yield (CPY) among treatments.…”

Section: Crude Protein Assessmentmentioning

confidence: 99%

Herbage yield and crude protein concentration of rangeland and pasture following hog manure application in southeastern Alberta

Blonski¹,

Bork²,

Blenis³

2004

Can. J. Plant Sci.

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Blonski, L. J., Bork, E. W. and Blenis, P. V. 2004. Herbage yield and crude protein concentration of rangeland and pasture following hog manure application in southeastern Alberta. Can. J. Plant Sci. 84: [773][774][775][776][777][778][779][780][781][782][783]. Intensive hog production is expanding into semi-arid regions of Alberta, where perennial forage lands are increasingly targeted for manure application despite limited guidelines for its efficient use. Herbage yield and crude protein were assessed over two consecutive years within two native rangelands and two tame pastures, following different rates (10, 20, 40, 80 and 160 kg ha -1 NH 4 -N), methods (surface banding vs. subsurface injection) and seasons (fall vs. spring) of one-time liquid hog manure (LHM) application. Increasing manure rates improved grass yield across all sites the first growing season after treatment, from 1626 to 3576 kg ha -1 . Although absolute increases in production were greatest on tame pasture, relative yield increases were similar among sites. Average crude protein (CP) concentration also increased from 69 to 91 g kg -1 in the first year. Despite low rainfall and the absence of a yield response in the second year, grass CP and crude protein yield (CPY) were maximized with increased manure application, highlighting the positive effects of manure on forage production, even with drought. Forb yields demonstrated variable effects among sites, with increasing manure decreasing alfalfa and increasing native forbs. Overall, both semi-arid tame pastures and native rangelands responded positively to LHM application, highlighting the complementary nature of hog and forage production under these conditions. Le rendement fourrager augmente avec le taux d'application à tous les endroits la saison végétative suivant le traitement pour passer de 1 626 à 3 576 kg par hectare. Bien que la production augmente davantage dans les prairies artificielles en termes absolus, le rendement relatif demeure le même aux différents endroits. La quantité moyenne de protéines brutes s'accroît elle aussi la première année, soit de 69 à 91 g kg -1 . Malgré la pluie et l'absence de réaction du rendement la deuxième année, la concentration de protéines brutes des herbages et le rendement en protéines brutes atteignent leur maximum avec l'augmentation du taux d'application, ce qui souligne les effets positifs du fumier pour la production fourragère, même quand il y a sécheresse. Le rendement en herbacées dicotylédones révèle que la réaction varie d'un site à l'autre, la production de luzerne diminuant et celle d'herbacées dicotylédones indigènes augmentant avec l'application de fumier. Dans l'ensemble, les prairies artificielles et les grands parcours naturels des régions semi-arides réagissent bien à l'application de lisier, signe que l'élevage de porc et la culture fourragère sont complémentaires dans de telles conditions.

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“…Due to chlorophyll saturation, chlorophyll sensors fail to detect over-fertilization and lack the sensitivity to distinguish between different N treatments [102]. However, reliable correlation between reflectance and plant N concentration was obtained in the region of the spectrum between 480 and 870 nm [103], and analytical procedures that take into consideration at least two spectral indices, rather than one, have demonstrated capacity to better diagnose leaf N concentration [104]. Such is the case of the Dualex sensor that measures flavonol, anthocynin and Chlorophyll simultaneously [105].…”

Section: Technologies To Diagnose Crop N Statusmentioning

confidence: 99%

Emerging and Established Technologies to Increase Nitrogen Use Efficiency of Cereals

et al. 2016

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Nitrogen (N) fertilizers are one of the most expensive inputs in agricultural settings. Additionally, the loss of N increases costs, contributes to soil acidification, and causes off-site pollution of the air, groundwater and waterways. This study reviews current knowledge about technologies for N fertilization with potential to increase N use efficiency and reduce its negative effects on the environment. Classic inorganic sources such as urea and ammonium sulfate are the major sources utilized, while controlled N release fertilizers have not been significantly adopted for cereals and oil crops. Microorganisms, with the exception of Rhizobium sp. in soybeans, are also not widely used nowadays (e.g., plant growth-promoting bacteria and cynobacteria). The interest in implementing new N fertilization knowledge is stimulating the development of sensors to diagnose the N status and decision support systems for integrating several variables to optimize sources, rates and methods of application. Among potential new technologies we identified the incipient development of nanofertilizers, nutrient formulations to coat seeds, and recycled nutrients. Furthermore, increasing concern about the environmental consequences of N may facilitate the implementation of innovations outside the farm such as more effective regulations to guide N fertilization and methods to manufacture N fertilizers that are more energy-efficient and less CO 2 equivalent emitting.

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Comparison of methods for determination of nitrogen levels in soil, plant and body tissues, and water

Cited by 24 publications

References 3 publications

Pesticide sorption and leaching potential on three Hawaiian soils

Pesticide sorption and leaching potential on three Hawaiian soils

Herbage yield and crude protein concentration of rangeland and pasture following hog manure application in southeastern Alberta

Emerging and Established Technologies to Increase Nitrogen Use Efficiency of Cereals

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