Rapid Digestion Method for Determination of Phosphorus

Bolin, D. W.; Stamberg, Olof E.

doi:10.1021/i560129a031

Cited by 46 publications

(18 citation statements)

References 5 publications

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“…Lanthanum oxide was added to Ca and Mg samples to reduce interference. Phosphorus was determined by the rapid digestion method (Bolin and Stramberg 1944).…”

Section: Methodsmentioning

confidence: 99%

Effects of Plant Shredding on Nutrient Content of Four South Texas Deer Browse Species

Everitt¹

1983

Journal of Range Management

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The nutrient content [crude protein (CP), P, Ca, K, and Mg] of the regrowth of shredded and current growth of nonshredded (Control) plants was measured for 4 important deer browse species in south Texas. Plants were shredded in February, April, and July of 1980. Plants shredded in February and their controls were sampled for nutrient analyses at 2,6, and 9 months after shredding. Plants shredded in April and July and their controls were sampled for analyses 2 months after shredding. Two months after shredding, regrowth from plants shredded in February, April, and July generally had higher CP and P than current growth from nonshredded plants. Few differences were detected in CP and P at 6 and 9 months after shredding. These results indicate that CP and P levels could be increased in initial regrowth from plants shredded at various dates during the growing season. Levels of Ca, K, and Mg did not differ between shredded and current growth, or they were slightly lower in the regrowth.

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“…Lanthanum oxide was added to Ca and Mg samples to reduce interference. Phosphorus was determined by the rapid digestion method (Bolin and Stramberg 1944).…”

Section: Methodsmentioning

confidence: 99%

Effects of Plant Shredding on Nutrient Content of Four South Texas Deer Browse Species

Everitt¹

1983

Journal of Range Management

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“…For comparisons of the accumulation patterns of the trees, three different collection periods (2)(3)(4)(5)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20), and 45-80 days after injection) were available for some trees, two were available for some, and only one for a few. Figure 1 shows the increase in accumulation with time for a representative pole blighted tree.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the total phosphorus for most samples was determined by wet digestion followed by the colorimetric molybdo-vanadate method (2).…”

Section: Introductionmentioning

confidence: 99%

Movement and Distribution of Radiophosphorus in Crowns of Healthy and Pole Blighted Western White Pines. (Pinus Monticola D. Don.)

1960

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“…Sub-samples were dried for 120 hr in a forced-air oven at 70°C and ground to pass a 100-mesh screen. Bermudagrass forage and soil samples were analyzed for total N and organic carbons (C) (soil only), by dry combustion, (Schepers et al, 1989), and total P (only prefertilization at Burneyville 1995) using the vanadomolybdate method without the use of sulfuric acid (H 2 SO 4 ) in the digest (Barton, 1942;Bolin and Stamberg, 1944). Soil samples were additionally analyzed for pH ( 1:1 soihwater), ammoniumnitrogen (NH 4 -N) and NO 3 -N [2M potassium chloride (KC1) extractant, LACHAT, 1989], and extractableK and P [Mehlich III extractant (Mehlich, 1984)].…”

Section: Methodsmentioning

confidence: 99%

Use of spectral radiance for correcting nitrogen deficiencies and estimating soil test variability in an established bermudagrass pasture

Taylor

Raun

Solie

et al. 1998

Journal of Plant Nutrition

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The use of variable rate technology has become increasingly popular for applying plant nutrient elements. The most widely used method for determining variable fertilizer rates is presently based on soil testing and yield mapping. Three field studies (Bumeyville 1995, Burneyville 1996, and Ardmore 1996 were initiated in established Midland bermudagrass [Cynodon dacrylon (L) Pers.] pastures to determine the relationship between spectral radiance at specific wavelengths with forage nitrogen (N) removal and biomass, and to determine field variability of soil test parameters. Variable N (applied to 1.5 × 2.4 m subplots within 2.4 × 45.7 m main plots), fixed N and check treatments were evaluated at each location. Spectral radiance readings were taken in the red (671±6 nm), green (570±6 nm), and near infrared (NIR) (780±6 nm) wavelengths. The normalized difference vegetation index (NDVI) was calculated as NIR-red/NIR+red. Variable N rates were applied based on NDVI. The highest fixed variable N rate was set at 224, 336, and 672 kg N ha -1 for samples were collected in all variable rate plots (1.5 × 2.4 m) and analyzed for various soil test characteristics. NDVI, red, green, and NIR spectral radiance readings were correlated with bermudagrass forage N removal and yield. Correlation of forage yield and N removal with red, NIR, and NDVI were best with maximum forage production, however, when forage production levels were low correlation decreased dramatically for the red wavelength compared with NIR and NDVI. Forage yield and forage N removal in variable rate treatments increased when compared to the check while being equal to the half-fixed and fixed rates where higher N rates were applied. Also, variability about the mean in variable rate plots was significantly lower than half-fixed and fixed rates which supports adjusting N rates based on indirect NDVI measurements. Variable N rate plots reduced fertilizer inputs by 60% and produced the same yield as fixed rate plots, while fixed and half-fixed rates did not increase N content in the forage over that of the variable rate treatment. Soil sample data collected from small consecutive plots (<4 m 2 ) was extremely variable indicating that intense sampling would be needed if variable fertilizer application were to be based on soil test results.

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Rapid Digestion Method for Determination of Phosphorus

Cited by 46 publications

References 5 publications

Effects of Plant Shredding on Nutrient Content of Four South Texas Deer Browse Species

Effects of Plant Shredding on Nutrient Content of Four South Texas Deer Browse Species

Movement and Distribution of Radiophosphorus in Crowns of Healthy and Pole Blighted Western White Pines. (Pinus Monticola D. Don.)

Use of spectral radiance for correcting nitrogen deficiencies and estimating soil test variability in an established bermudagrass pasture

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