Magnesium Deficiency of Apples in The Nelson District of New Zealand

Kidson, Elso B.; Askew, H.; Chittenden, E. T.

doi:10.1080/03683621.1941.11513557

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…Interfering colors, formed in the presence of iron, nickel, copper, and chromium, are destroyed by boiling with concentrated nitric acid after all the other reagents have been added. Nitroso R salt has been used for the quantitative colorimetric determination of small amounts of cobalt in biological samples (12,15,25), soils and pasture samples (11,12,17), limonites (16), and steels and other metallurgical products (9,27).…”

Section: Cobalt Determinationmentioning

confidence: 99%

Determination of Cobalt in Atmospheric Samples

Keenan¹,

Flick²

1948

Anal. Chem.

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A method has been developed for the determination of cobalt in atmospheric dust samples and applied to the analysis of environmental samples from the cemented tungsten carbide industry. The sample is fused with potassium peroxydisulfate after preliminary ignition of any free carbon present; the cooled melt is dissolved in water, acidified, and diluted to volume; after thorough mixing, a suitable aliquot portion is removed, filtered, washed, evaporated almost to dryness, oxidized with concentrated nitric acid, and evaporated to dryness; after solution in water and hydrochloric acid, the cobalt is determined colorimetrically by means of a modification of the nitroso R salt method. The application of this method to atmospheric carbide dust samples has indicated that for samples containing 0.1 mg. of cobalt or more, its accuracy is at least 95%. ANALYTICAL methods for the determination of cobalt l.have been developed for application to such materials as ores, minerals, special steels, alloys and other metallurgical products, enamels, driers, soils, pasture samples, and biological

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Section: Cobalt Determinationmentioning

confidence: 99%

Determination of Cobalt in Atmospheric Samples

Keenan¹,

Flick²

1948

Anal. Chem.

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“…The soil type, Mapua sandy loam, is extensively used for apple growing in Nelson. (Magnesium deficiency in apple trees was first identified in Nelson on this soil type (Kidson, Askew, and Chittenden 1940)). Here also a certain amount of serpentine had been applied as serpentine super.…”

Section: Apple Treesmentioning

confidence: 99%

Magnesium uptake by pastures and apple leaves from top-dressings of ground serpentine and dunite

Chittenden

Watson

Hodgson

1964

New Zealand Journal of Agricultural Research

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“…The critical level of a nutrient may be defined as the level of the readily available form of that nutrient immediately below which plant growth and performance is restricted. Critical levels of available Mg have been put at 0.20 to 0.30 meqjlOO g of soil (5,13,16,18,19,20,25) and 0.30 to 0.40 meqjlOO g (11, 1:2, 21, 22).…”

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confidence: 99%

Critical Level of Mg in Western Nigerian Soils as Estimated under Greenhouse Conditions¹

Lombin¹,

Fayemi

1975

Agronomy Journal

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Widespread Mg deficiencies have not been reported in western Nigeria. But with continuous intensive cultivation, heavier fertilization especially with K, and the introduction of high yielding, responsive crop varieties Mg deficiency is likely to become a serious problem in the near future. Knowledge of the critical available Mg levels can be useful in conjunction with routine soil analysis data to monitor the onset of these deficiencies. There is no previously published work on Nigerian soils that estimated the available Mg level below which response to Mg fertilization can be expected. The objective of this investigation therefore was to approximate this critical level under greenhouse conditions. Twenty‐three Nigerian soils collected from various ecological zones and soil types were cropped to maize (Zea mays L.) in the greenhouse with and without Mg application. The maize tops were cut after 35 days, dried, weighed, milled, and analyzed for Mg. Using the dry matter weights relative yields were worked out for all the soils and the new Cate‐Nelson (6) statistical procedure used to estimate the critical level. This procedure involved a step‐wise splitting of the data into two groups using successive tentative critical levels to determine the level which maximized the overall predictive ability (R2) with the means of the two groups serving as the predictor values. An approximate critical level of 0.28 to 0.35 meq/100 g was obtained by this technique. Tests on individual plot yields showed that 0.28 meg/100 g neutral N NH4OAc, extractable Mg was low enough for statistically signficant response to Mg application. All soils (except no. 10) that had less than 5% saturation of CEC responded to Mg application; those with more than 7% Mg saturation did not respond to Mg. Mg deficiency symptoms were associated with soil Mg level of 0.17 meq/100 g or lower prior to planting and with plant Mg content of less than 0.1%. Although the critical level of available Mg approximated in this study (0.28 to 0.35 meq/100 g) is much lower than the average available Mg content (1.2 to 1.5 meq/100 g) of western Nigerian soils. Caution is nonetheless needed in evaluating the findings of the present study as greenhouse results may not necessarily reflect the true situations in the field.

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Magnesium Deficiency of Apples in The Nelson District of New Zealand

Cited by 8 publications

References 2 publications

Determination of Cobalt in Atmospheric Samples

Determination of Cobalt in Atmospheric Samples

Magnesium uptake by pastures and apple leaves from top-dressings of ground serpentine and dunite

Critical Level of Mg in Western Nigerian Soils as Estimated under Greenhouse Conditions¹

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Magnesium Deficiency of Apples in The Nelson District of New Zealand

Cited by 8 publications

References 2 publications

Determination of Cobalt in Atmospheric Samples

Determination of Cobalt in Atmospheric Samples

Magnesium uptake by pastures and apple leaves from top-dressings of ground serpentine and dunite

Critical Level of Mg in Western Nigerian Soils as Estimated under Greenhouse Conditions1

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Critical Level of Mg in Western Nigerian Soils as Estimated under Greenhouse Conditions¹