Micronutrient testing of plant growth media: Extractant identification and evaluation

Berghage, Robert; Krauskopf, Dean M.; Warncke, D. D.; Widders, Irvin E.

doi:10.1080/00103628709367885

Cited by 43 publications

(35 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the basis of the results of this experiment, it can be concluded that 0.002M DTPA used at 1 volume of medium to 1.5 volumes of extractant and a saturation extract containing DTPA (20) are equally good at predicting Fe supply to the range of plants grown. Choice between these two can be made on the basis of ease of use In routine analysis of large numbers of samples and on their relative abilities to predict available levels of other trace elements.…”

Section: Variablesmentioning

confidence: 91%

See 1 more Smart Citation

Assessment of iron availability in soilless potting media

Handreck

1989

Communications in Soil Science and Plant Analysis

View full text Add to dashboard Cite

Ferrous sulphate added to potting media based on wood wastes is rapidly rendered insoluble in water. The extractability by DTPA of the added Fe declines over about 7 days to a steady value which is maintained for at least 10 months whether plants are growing in the media or not. The sawdusts and barks tested all required at least 100 mg/L Fe, added as ferrous sulphate, to provide an optimum amount of available Fe; peats needed less Fe and were quite variable in their requirements. In several pot trials, excellent correlations (R 2 0.80-0.86) were obtained between quality or growth of shoots and a combination of medium pH and the concentration of Fe in unbuffered DTPA extractants of concentrations in the range 0.001 to 0.005M, or a saturation extract containing DTPA. Fe concentrations in DTPA/TEA/CaCl 2 , NaHCO 3 /DTPA, 0.5M ammonium acetate solutions and water were less precise indicators of Fe availability. At media pH values of 5.5-6.0. 0.002M DTPA (1:1.5 volume) extracts need to contain at least 20 mg/L Fe and preferably 30 mg/L Fe for adequate Fe supply if ferrous sulphate is the source of added Fe. Some species need at least 40 mg/L Fe or must be grown at a lower pH. These criteria do not hold if the main source of Fe is FeEDDHA.

show abstract

Section: Variablesmentioning

confidence: 91%

“…These samples were extracted with the Lindsay and Norvell (18) (20) were also prepared, and at harvest the media were extracted with ammonium acetate (21) as modified to 0.5M, pH 4.65, by Gabriels (22).…”

Section: Methodsmentioning

confidence: 99%

Assessment of iron availability in soilless potting media

Handreck

1989

Communications in Soil Science and Plant Analysis

View full text Add to dashboard Cite

show abstract

“…Phosphorus (P) was extracted using Olsen's method [9], other macronutrients and micronutrients were extracted by diethylenetriaminepentaacetic acid [10], and metals were determined by nitric acid digestion [11]. Contents were determined by inductively coupled plasma optical emission spectrometry [12] with a Spectro Genesis analyzer (SPECTRO Analytical Instruments, Kleve, Germany).…”

Section: Tissue and Soil Samplingmentioning

confidence: 99%

Current Status, Threats and Conservation Needs of The Endemic Cycas wadei Merrill

Te¹,

Uf²

2017

J Biodivers Endanger Species

View full text Add to dashboard Cite

The population size and structure of Cycas wadei were assessed along with habitat traits to update the current level of knowledge for conserving this Critically Endangered endemic species. Direct measurements of plant density and size, chemical analyses of soil and leaf tissue samples, and surveys of sympatric plants were conducted. The adult population was calculated at 5,051, indicating historical population size estimates were inaccurately low. Highest densities in forested fragments were 800 plants per hectare, with adults comprising 34% of the population. Density in grasslands was as high as 1,100 plants per hectare, with adults comprising 31% of the population. The dominant grass was Themeda gigantea (Cav.) Hackel, not Imperata as previously reported. The prediction that the soils were ultramafic was rejected but opinions that the soils were extremely infertile were confirmed by soil analyses. Leaf stoichiometry revealed the cycad plants were primarily limited by potassium availability and secondarily limited by phosphorus availability. Habitat conversion is the acute threat that must be monitored in the near future, and an attempt to moderate or halt this conversion is the greatest conservation need. Poaching is a second threat that has not been acute to date, but has the potential to become a greater threat if the remote habitat becomes more connected to national trade routes. Fire damage is the third major threat, and has the potential to become a greater threat if historical fire frequency is altered

show abstract

“…Extractable phosphorus was conducted using the modified Truog method [7], other macronutrients and micronutrients were extracted by diethylenetriaminepentaacetic acid [8], and metals were determined by nitric acid digestion [9]. Contents were determined by inductively coupled plasma optical emission spectrometry [10] with a Spectro Genesis analyzer (SPECTRO Analytical Instruments, Kleve, Germany).…”

Section: Analysesmentioning

confidence: 99%

Soil Chemistry Following Afforestation of Barren Coastal Soils in Southern Guam Does Not Conform to that of Continuously Vegetated Surfaces

Marler¹

2017

J Coast Zone Manag

View full text Add to dashboard Cite

Journal of Coastal Zone Management AbstractThe chemical changes in soils following the use of non-native Acacia trees to mitigate soil erosion from barren scars within Guam's grassland savanna were determined and compared to continuously vegetated sites. Chemistry of the soils in a 20-yr-old Acacia site was dissimilar to that of the grasslands and adjacent native forest sites. Stoichiometry calculations which characterize ecosystem function were unique within the Acacia site. Watershed management decisions that convert previous grasslands to exotic tree forests may have long-term effects on soil nutrients and create unique soil nutrient budgets. Increased knowledge of all affected ecological processes and embracing social sciences to include human behavior traits are needed to better inform Guam's ecosystem management decisions.

show abstract

Micronutrient testing of plant growth media: Extractant identification and evaluation

Cited by 43 publications

References 10 publications

Assessment of iron availability in soilless potting media

Assessment of iron availability in soilless potting media

Current Status, Threats and Conservation Needs of The Endemic Cycas wadei Merrill

Soil Chemistry Following Afforestation of Barren Coastal Soils in Southern Guam Does Not Conform to that of Continuously Vegetated Surfaces

Contact Info

Product

Resources

About