Colorimetric Determination of Phosphorus Pentoxide in Fertilizers Using Standard Calibration Plot

Bridger, G. L.; Boylan, D. R.; Markey, J. W.

doi:10.1021/ac60074a034

Cited by 34 publications

(18 citation statements)

References 8 publications

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“…The leaves were dried in a forced-draught air oven at 5O-6o°C (at Kituza and Kamenyamigo this was done on the sampling day, but samples from West Nile had to wait 1-4 days before they reached the oven), ground to pass a 20-mesh screen and redried at 7O°C. The nitrogen content of the dried ground sample was determined by a semi-micro Kjeldahl method, phosphorus and sulphur by wet digestion and colorimetric determinations (Butters & Chenery, 1959;Bridger et al, 1953) and cations by dry ashing at 5OO-55O°C followed by determination spectrographically or with a flame photometer, using lanthanum chloride to suppress interference from phosphate and aluminium (Hughes, 1961;Yofe & Finkelstein, 1958;Williams, i960).…”

Section: Camentioning

confidence: 99%

Experiments with Nitrogen and Magnesium Fertilizers on Coffee in Uganda

Stephens¹

1967

Ex. Agric.

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SummaryThree experiments and five small trials on robusta coffee and four small trials on arabica coffee have confirmed that nitrogen is the main nutrient requirement in Uganda. Magnesium and sulphur were not deficient and mulching had no effect on responses to nitrogen fertilizers. Leaf and soil analyses confirm the yield results and indicate that the optimum time to apply nitrogen is in February and September. There was little difference between ammonium sulphate and urea, but the former tended to have greater effects on yields.

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Section: Camentioning

confidence: 99%

Experiments with Nitrogen and Magnesium Fertilizers on Coffee in Uganda

Stephens¹

1967

Ex. Agric.

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“…Protein was determined by the Kjeldahl mthod (A.Q.A.C. 2.036); total sulfur and SO,-S, by the method of Johnson and Nishita (1952); total phosphorus, by usc of the mixed color reagent method proposed by Bridger et a!. (1953); and acid-detergent fiber and lignin, using Van Soest's (1963) method.…”

Section: Methodsmentioning

confidence: 99%

Effect of Sulfur Fertilization of Forage Species on Yield, Chemical Composition, and In vitro Rumen Microbial Activity of Sheep¹

Lancaster¹,

Jones²,

Oh³

et al. 1971

Agronomy Journal

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Three grasses, (Dactylis glomerata L.), (Lolium multiflorum L.), and (Sorghum vulgare var. sudanese L.), and two legumes, (Trifolium repens L.) and (Medicago sativa L.), were grown in pots on S‐deficient soil fertilized with varying levels of S. In vitro rumen microbial activity as affected by these forages was measured in terms of total gas production using an anaerobic manometric technique. The rumen microbial activity in the grasses increased with increasing S, whereas it decreased with increasing S in the legumes. The microbial activity was inversely related to the level of protein in the plants and directly related to soluble carbohydrates.

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“…'H'et ashing of plant samples and determination of total S followed a procedure outlined by Johnson and Nishita (1952) except that 200-ml tall-form beakers were used and a crystal of ::u was added near the close of digestion to insure reduction of excess oxidants. Total P was determined on an aliquot of the same digested material by use of the mixed-color reagent as }roposed by Bridger et al (1953).…”

Section: Methodsmentioning

confidence: 99%

Differences in Annual Clover Responses to Phosphorus and Sulfur¹

Jones¹,

Lawler²,

Ruckman³

1970

Agronomy Journal

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Many new varieties of winter annual legumes are now available for pastures in Mediterranean type climates. Since little work has been reported comparing the relative responses of these legumes to fertilization, 10 varieties of subclover, 6 of rose clover, 3 annual Medicagos, and 2 other annual clovers were grown in the greenhouse on a soil known to be deficient in P and S. There were four levels of P with S applied. The nil and highest P levels were repeated without S. Yield differences between varieties and species were small where no P or S was applied. Responses to S alone were generally not significant, but responses to P only and P plus S varied significantly. Differences in response to P and S fertilization were as great among varieties of a given species as between species. Highest yielding clover varieties tended to have lowest percentages of P and S. Differences in P and S uptake by the clover varieties were significant; however, uptake responses to fertilization tended to be relatively smaller than yield response differences, indicating that some varieties utilized absorbed nutrients more efficiently than others. Response to fertilization apparently must be considered on a varietal basis rather than generalizing about species.

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Colorimetric Determination of Phosphorus Pentoxide in Fertilizers Using Standard Calibration Plot

Cited by 34 publications

References 8 publications

Experiments with Nitrogen and Magnesium Fertilizers on Coffee in Uganda

Experiments with Nitrogen and Magnesium Fertilizers on Coffee in Uganda

Effect of Sulfur Fertilization of Forage Species on Yield, Chemical Composition, and In vitro Rumen Microbial Activity of Sheep¹

Differences in Annual Clover Responses to Phosphorus and Sulfur¹

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Colorimetric Determination of Phosphorus Pentoxide in Fertilizers Using Standard Calibration Plot

Cited by 34 publications

References 8 publications

Experiments with Nitrogen and Magnesium Fertilizers on Coffee in Uganda

Experiments with Nitrogen and Magnesium Fertilizers on Coffee in Uganda

Effect of Sulfur Fertilization of Forage Species on Yield, Chemical Composition, and In vitro Rumen Microbial Activity of Sheep1

Differences in Annual Clover Responses to Phosphorus and Sulfur1

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Effect of Sulfur Fertilization of Forage Species on Yield, Chemical Composition, and In vitro Rumen Microbial Activity of Sheep¹

Differences in Annual Clover Responses to Phosphorus and Sulfur¹