Comparison of soil extractions by 0.01M CaCl2, by EUF and by some conventional extraction procedures

Houba, V.J.G.; Novozámský, I.; Huybregts, A. W. M.; Lee, J. J. van der

doi:10.1007/bf02375149

Cited by 234 publications

(119 citation statements)

References 8 publications

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“…Sub-samples of 12 g soil were extracted at a ratio of 1:10 (dry soil weight/ extractant volume) with 0.01 mol/L CaCl 2 , shaken for 1 h and filtered. The filtrates were analyzed for mineral N with a TRAACS Model 2000 continuous flow autoanalyzer (Houba et al 1986). Water contents in the soil samples were determined gravimetrically to calculate soil N min on a dry soil basis.…”

Section: Sampling and Analysismentioning

confidence: 99%

Influence of root zone nitrogen management and a summer catch crop on cucumber yield and soil mineral nitrogen dynamics in intensive production systems

Guo

Christie

et al. 2008

Plant Soil

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Section: Sampling and Analysismentioning

confidence: 99%

Influence of root zone nitrogen management and a summer catch crop on cucumber yield and soil mineral nitrogen dynamics in intensive production systems

Guo

Christie

et al. 2008

Plant Soil

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“…In one sub-sample, organic carbon (C) was determined by dichromate-oxidation . A second sub-sample was shaken for 2 h in 0.01 M CaCl 2 (mass ratio 1:10), centrifuged at 48,000g (Houba et al 1986(Houba et al , 1990; in the supernatant of the centrifuged suspension NH 4 -N and NO 3 -N were determined by using standard auto-analyser . The third sub-sample was digested in a mixture of H 2 SO 4 and salicylic acid and Se, to which H 2 O 2 was added .…”

Section: Chemical Analysismentioning

confidence: 99%

Laboratory and greenhouse assessment of plant availability of organic N in animal manure

Antil

Janssen

Lantinga

2009

Nutr Cycl Agroecosyst

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Laboratory data (thermal fractionation, pepsin extraction, C:N o ratio) of dung and manure were mutually compared and contrasted with plantavailability of organic N (N o ) as found in a greenhouse experiment according to the double-pot technique. Two types of fresh cow dung (one with a relatively wide and the other with a relatively narrow C:N o ratio) and four types of manure (from poultry, sheep, pigs and cow) were compared with ammonium nitrate as chemical reference fertilizer. Relative effectiveness of organic N (RE o ) was used as characteristic; it was calculated as the fraction of organic N that has the same availability to plants as inorganic N. RE o for poultry and sheep manure could not be assessed, probably because of NH 3 volatilization causing direct damage to plants and N losses. RE o values decreased in the order: dung with narrow C:N o [ dung with wide C:N o [ pig manure [ cow manure. Thermal fractionation did not provide a suitable index of plant-availability of organic N. Pepsin extracted organic N gave a positive, and C:N o ratio a negative relationship with RE o . Also between pepsin extracted organic N and C:N o ratio a negative relationship was found. As C:N o ratio is relatively easy to determine, it is considered the most practical laboratory index for plant availability of organic N in animal manures low in ammonia. When using the double-pot technique, application rates of manure types high in ammonia should be restricted.

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“…A total of 12-g sub-samples were extracted with 0.01 mol L À1 CaCl 2 at a ratio of 1:10 (dry soil wt/extractant volume) with shaking for 1 h and filtration of the extract. The filtrate was analyzed for nitrate and ammonium using a continuous flow autoanalyzer (TRAACS Model 2000) according to Houba et al (1986). Water in the soil samples was determined gravimetrically to calculate soil N min on a dry matter basis.…”

Section: Sampling and Analysismentioning

confidence: 99%

Seasonal temperatures have more influence than nitrogen fertilizer rates on cucumber yield and nitrogen uptake in a double cropping system

Guo¹,

Li²,

Christie³

et al. 2008

Environmental Pollution

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Nitrogen inputs can be reduced to minimize N losses to the environment while maintaining yields but N recommendations must reflect seasonal temperature effects.Abstract Two-year greenhouse cucumber experiments were conducted to investigate seasonal effects on fruit yield, dry matter allocation, and N uptake in a double-cropping system with different fertilizer management. Seasonal effects were much greater than fertilizer effects, and winterespring (WS) cucumber attained higher fruit yields and N uptake than autumnewinter (AW) cucumber due to lower cumulative air temperatures during fruit maturation in the AW season. Fertilizer N application and apparent N loss under recommended N management (Nmr) decreased by 40e78% and 33e48% without yield loss compared to conventional N management (Nmt) over four growing seasons. However, there were no seasonal differences in N recommendations, taking into consideration seasonal differences in crop N demand, critical nutrient supply in the root zone and N mineralization rate.

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Comparison of soil extractions by 0.01M CaCl2, by EUF and by some conventional extraction procedures

Cited by 234 publications

References 8 publications

Influence of root zone nitrogen management and a summer catch crop on cucumber yield and soil mineral nitrogen dynamics in intensive production systems

Influence of root zone nitrogen management and a summer catch crop on cucumber yield and soil mineral nitrogen dynamics in intensive production systems

Laboratory and greenhouse assessment of plant availability of organic N in animal manure

Seasonal temperatures have more influence than nitrogen fertilizer rates on cucumber yield and nitrogen uptake in a double cropping system

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