Observations on the residual value of accumulated phosphorus in a red loam

1964 ◽  
Vol 15 (3) ◽  
pp. 377 ◽  
Author(s):  
JD Hughes ◽  
PGE Searle
Keyword(s):  
Total Phosphorus ◽  
Residual Value ◽  
Phosphorus Level ◽  
Monocalcium Phosphate ◽  
High Phosphorus ◽  
Pot Trial ◽  
The Difference ◽  
Phosphorus Levels

A pot trial was conducted in which tomatoes were grown in soils containing a range of total phosphorus depending on the amount of superphosphate which had been applied during the previous 9 years. Monocalcium phosphate was mixed with all soils to give 25, 75, or 150 p.p.m. added phosphorus. The above-ground portions of the plants were harvested after 47 days, and the pots seeded again without further additions of fertilizer. This crop was harvested 59 days later. It was shown that the response to current applications of phosphorus was dependent on the total phosphorus level. The addition of a given amount of phosphorus produced bigger yields on the high phosphorus soils. Moreover, the higher the level of applied phosphorus, the greater the difference in yield between soils of different total phosphorus levels. Yields were considerably lower in the second crop, but the interaction between total and applied phosphorus was still evident.It was concluded that the availability of the accumulated phosphorus was extremely low, and that the increased yields on the high phosphorus soils were due to a better utilization of applied phosphorus as a result of reduced fixation in these soils. The decrease in the rate of fixation was explained by blocking of fixation sites by the previously fixed phosphorus.

scholarly journals THE AVAILABILITY TO ALFALFA OF PHOSPHORUS FROM TWELVE DIFFERENT CARRIERS

1959 ◽  
Vol 39 (1) ◽  
pp. 54-63 ◽  
Author(s):  
J. D. Beaton ◽  
K. F. Nielsen
Keyword(s):  
Total Phosphorus ◽  
Sandy Loam ◽  
Soil Phosphorus ◽  
Phosphorus Uptake ◽  
Ammonium Phosphate ◽  
Monocalcium Phosphate ◽  
High Base ◽  
Highly Correlated ◽  
Extractable Soil ◽  
Phosphorus Levels

Availabilities of the phosphorus in twelve different phosphate sources to alfalfa were determined in a growth chamber. Two crops of alfalfa were grown on two soils of high base status, Machete stony sandy loam and Westwold loam. Fertilizer materials containing monocalcium phosphate or materials such as calcium metaphosphate which are converted to monocalcium phosphate brought about the greatest increases in yield. However, yield increases also resulted from treatments with the ammonium phosphates and orthophosphoric acid. Ammonium phosphate fertilizers were the most effective in increasing the percentage of phosphorus present in the alfalfa tissue. Ammonium phosphate and monocalcium phosphate materials were equally effective in increasing total phosphorus uptake by alfalfa. The amount of CO2 soluble phosphorus extracted from the Westwold loam, following treatment with the various phosphate sources, was correlated with the yield of the first crop of alfalfa. The average per cent P in the alfalfa tissue was found to be correlated with the CO2 soluble P. Both the NaHCO3 and CO2 extractable soil phosphorus levels of the Westwold loam, after it had been treated with the different phosphate materials, were found to be highly correlated with the phosphorus uptake by the second crop of alfalfa and with the total phosphorus uptake.

Spatial and Temporal Water Quality Trends in Severn Sound, Georgian Bay, since the Introduction of Phosphorus Control Guidelines: Nutrients and Phytoplankton, 1973 to 1991

1995 ◽  
Vol 30 (4) ◽  
pp. 565-592 ◽  
Author(s):  
A.F. Gemza
Keyword(s):  
Total Phosphorus ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Soluble Reactive Phosphorus ◽  
Euphotic Zone ◽  
Water Clarity ◽  
Sewage Treatment Plants ◽  
Order Of Magnitude ◽  
Phosphorus Levels

Abstract Severn Sound continues to exhibit signs of eutrophication despite initial identification of the problem in 1969 and the construction of several sewage treatment plants since then. In general, improvements in trophic state indicators have been marginal, suggesting that the sewage treatment plants have had limited success in controlling phosphorus concentrations. These discharges likely contributed to the increased total phosphorus levels and consequently the higher phytoplankton densities of the nearshore waters. Phytoplankton biovolumes were on average one order of magnitude higher than in the open waters of Lake Huron with mean summer biovolumes as high as 8.0 mm/L. Algal biovolumes were most dense in Penetang Bay, which experienced limited exchange with the main waters of the sound. No significant long-term trends were observed. Water clarity was declining significantly, however, at a rate of -0.60 to -0.78 m/year throughout the sound except in Sturgeon Bay. Total phosphorus levels were highly variable from year to year; however, concentrations from a 20-year perspective were declining in the open waters at a rate of 0.70 µg/L/year, but response was limited in nearshore areas. In Sturgeon Bay, mean annual euphotic zone total phosphorus as well as soluble reactive phosphorus levels declined by as much as 50% following the construction of a sewage treatment plant with tertiary treatment. Phytoplankton genera typical of eutrophic waters continued to dominate the algal assemblage but members indicative of mesotrophic conditions have become apparent in some areas of the sound.

MO775CONTROL OF BONE DISEASE ASSOCIATED WITH CHRONIC KIDNEY DISEASE AS A PREDICTOR OF PRIMARY PERMEABILITY AFTER THE CREATION OF THE VASCULAR ACCESS

2021 ◽  
Vol 36 (Supplement_1) ◽  
Author(s):  
Luis Guillermo Piccone Saponara ◽  
Maria Paz Castro Fernández ◽  
Nancy Giovanna Uribe Heredia ◽  
Agustin Carreno ◽  
Sara Anaya Fernandez ◽  
...  
Keyword(s):  
Antiplatelet Therapy ◽  
Vascular Access ◽  
Statistical Significance ◽  
Univariate Analysis ◽  
Primary Patency ◽  
Categorical Variables ◽  
Cross Sectional ◽  
High Phosphorus ◽  
The Creation ◽  
Phosphorus Levels

Abstract Background and Aims Clinical practice guidelines recommend an arteriovenous fistula (AVF) as the preferred vascular access for hemodialysis. Patency of the arteriovenous access is important for effective hemodialysis. However, maintaining the patency of the AVF remains a challenge. We determined those independent prognostic factors for the patency of the AVF at the time of its creation. Method Cross-sectional study; We include all AVFs performed at the HGUCR in the last 2 decades. Demographic variables (age, sex), etiology of CKD and associated comorbidity were collected. We determine the factors involved in the primary patency of AVFs. Statistical analysis with SPSS 25.0. Categorical variables are expressed as percentages and are compared using the Chi2 test. Quantitative variables are expressed as mean ± standard deviation and the Mann Whitney Student-T/U was used to compare them. Statistical significance for a value of p <0.05. Results 622 AVFs performed in 482 patients were reviewed. 86.8% were autologous. The mean age was 65.4±14 years; 66.6% were male. The most frequent etiologies of CKD were diabetic nephropathy (30.2%), unknown (18%), and glomerulonephritis (16.6%). 91.2% had arterial hypertension (HBP) and diabetes mellitus (DM) 47.9%. 48.7% received antiplatelet therapy and 15.6% anticoagulation prior to the creation of the AVF. 27% presented primary failure. The univariate analysis showed statistical significance for the qualitative variables HTA (p=0.002), treatment with statins (p<0.01) and antiplatelet (p<0.01), and for the quantitative variables fibrinogen (p=0.048), serum phosphorus (p=0.001), CRP (p=0.004), triglycerides (p=0.05), ferritin (p=0.006) and age (p=0.05). When performing a multivariate analysis using logistic regression, HTA (OR: 0.46 95% CI 0.22-0.95 p = 0.036), high phosphorus levels (OR: 1.22 95% CI 1.08-1, 49 p = 0.004) and statin treatment (OR: 0.58 95% CI 0.36-0.96 p = 0.004) are predictors of primary VA failure. Conclusion In our study, HTA and antiplatelet therapy prior to the creation of the VA behave as protective factors for primary failure, with high phosphorus levels being an independent factor for primary failure of AVFs.

Poorly soluble, iron-aluminium phosphates in ammonium phosphate fertilizers: Their nature and availability to plants

Soil Research ◽  
1983 ◽  
Vol 21 (2) ◽  
pp. 183 ◽  
Author(s):  
RJ Gilkes ◽  
P Mangano
Keyword(s):  
Total Phosphorus ◽  
Powder Diffraction ◽  
Phosphorus Content ◽  
Ammonium Phosphate ◽  
Residual Value ◽  
Phosphate Fertilizers ◽  
Total Phosphorus Content ◽  
X Ray ◽  
Poorly Soluble ◽  
Residual Effectiveness

Both monoammonium and diammonium phosphate fertilizers contain various (Ca,Mg)(NH4)- (Fe,Al)(PO4)(F,OH)H2O compounds that are insoluble in water and comprise 4.9-9.9% of the total phosphorus content of the fertilizers. The compounds have been isolated and characterized by chemical, X-ray powder diffraction, ix., and thermogravimetric techniques. The compounds are only 35-60% as effective as monocalcium phosphate (MCP) in supplying phosphorus to wheat grown under glasshouse conditions. The residual effectiveness of the compounds for a second crop of wheat was generally lower (10-20% relative to freshly applied MCP) than the residual value of MCP (20 %).

Effects of soils, fertilizers and stocking rates on pastures and beef production on the Wallum of south-eastern Queensland. 3. Relation of liveweight changes to chemical composition of blood and pasture

1973 ◽  
Vol 13 (64) ◽  
pp. 537 ◽  
Author(s):  
RF Thornton ◽  
DJ Minson
Keyword(s):  
Plasma Concentrations ◽  
Inorganic Phosphorus ◽  
Nitrogen And Phosphorus ◽  
The Difference ◽  
Treatment Comparisons ◽  
Mineral Levels ◽  
Induced Changes ◽  
Stocking Rates ◽  
Phosphorus Levels

During the concluding phase of a six-year grazing trial a study was made of the steers and the pasture material from paddocks annually fertilized with 125 kg ha-1and 250 kg ha-1of superphosphate. Plucked pasture samples from the low and high superphosphate treatments contained 0.11 and 0.15 per cent phosphorus, 0.83 and 0.91 per cent nitrogen and 0.12 and 0.12 per cent sulphur, respectively. The N: S ratio of these samples were 6.8 and 7.6 and the in vitro digestibilities were 41.6 and 44.9 per cent. There were marked seasonal patterns in the concentrations of all components with minimum values in the winter months when liveweight gain was lowest. Greater superphosphate application increased mean liveweight gain (0.29 to 0.41 kg head-1day-1), mean plasma concentrations of both urea-nitrogen (6.3 vs 5.0 mg 100 ml-1) and of inorganic phosphorus (6.7 vs 6.3 mg 100 ml-1). The mean blood sulphate-sulphur concentration of 28 �g ml-I was not influenced by treatment. Comparisons of the levels of nutrients in pasture and blood with published requirements indicated that neither sulphur nor phosphorus were deficient in either treatment. However, the between treatment differences in both nitrogen and phosphorus levels could not be ignored as possible reasons for the difference in animal production between the two levels of superphosphate application. Improved animal performance associated with increased application of superphosphate was probably influenced more by the induced changes in the organic components rather than the mineral levels of the pasture material.

Runoff characteristics of nutrients in the forest streams in Hyogo Prefecture, Japan

2001 ◽  
Vol 44 (7) ◽  
pp. 151-156 ◽  
Author(s):  
S. Umemoto ◽  
Y. Komai ◽  
T. Inoue
Keyword(s):  
Total Nitrogen ◽  
Total Phosphorus ◽  
Suspended Solids ◽  
Nitrate Nitrogen ◽  
Ammonium Nitrogen ◽  
Stream Flows ◽  
The Difference ◽  
Hyogo Prefecture ◽  
Forest Streams ◽  
Precipitation Events

Nutrients and other pollutant runoffs from streams in artificial forest areas in central Hyogo Prefecture in southwest Japan have been investigated to estimate pollutant loads since 1995. The orthophosphate and ammonium nitrogen contents were usually low and constant during the investigation. When the flowrates of the streams were normal, the concentrations of suspended solids, CODMn, TOC and total phosphorus were very low, and did not change much. However, when stream flows were increased by rainstorms or other precipitation, higher concentrations of these parameters occurred. Otherwise, the average concentrations of nitrate nitrogen and total nitrogen were 0.26 mg/l and 0.31 mg/l, respectively, and they were often increased by precipitation events. They changed at the same time because the ratio of nitrate nitrogen per total nitrogen was high, about 80%. The fluctuation of concentrations of total phosphorus was similar to SS concentrations, which suggested that phosphorus was discharged in the types of suspended solids from forest areas. The specific loads of the nutrients and some other pollutants did not differ among the three watersheds investigated. However, the difference among them between fine days and rainy days was fairly large. It was presumed that pollutant runoff from forest areas is strongly dependent on precipitation events.

High Phosphorus Level Leads to Aortic Calcification via β-Catenin in Chronic Kidney Disease

2015 ◽  
Vol 41 (1) ◽  
pp. 28-36 ◽  
Author(s):  
Li Yao ◽  
Yi-ting Sun ◽  
Wei Sun ◽  
Tian-hua Xu ◽  
Chuang Ren ◽  
...  
Keyword(s):  
Chronic Kidney Disease ◽  
Kidney Disease ◽  
Serum Levels ◽  
Aortic Calcification ◽  
In Vivo Model ◽  
Phosphorus Level ◽  
Abdominal Aortic Calcification ◽  
High Phosphorus ◽  
Abdominal Aortic

Aims: Vascular calcification is a risk factor for causing cardiovascular events and has a high prevalence among chronic kidney disease (CKD) patients. However, the molecular mechanism underlying this pathogenic process is still obscure. Methods: Vascular smooth muscle cells (VSMCs) were induced by a concentration of phosphorus (Pi) of 2.5 mM, and were subjected to cell calcification analyses. The effect of high Pi on the Wnt/β-catenin pathway was measured using a TOP/FOP-Flash reporter assay. The transcriptional regulation of β-catenin on PIT1 (a type III sodium-dependent phosphate cotransporter) was confirmed by promoter reporter and chromatin immunoprecipitation assays. The 5/6 nephrectomized rat was used as an in vivo model and was fed a high Pi diet to induce aortic calcification. Serum levels of phosphate, calcium, creatine, and blood urea nitrogen were measured, and abdominal aortic calcification was examined. Results: High Pi induced VSMC calcification, downregulated expression levels of VSMC markers, and upregulated levels of osteogenic markers. High Pi activated the Wnt/β-catenin pathway and β-catenin activity. β-Catenin was involved in the process of high Pi-induced VSMC calcification. Further investigation revealed that β-catenin transcriptionally regulated Pit1, a necessary player in VSMC osteogenic phenotype change and calcification. The in vivo study showed that β-catenin was involved in rat abdominal aortic calcification induced by high Pi. When knockdown expression of β-catenin in the rat model was investigated, we found that aortic calcification was reduced. Conclusion: These results suggest that β-catenin is an important player in high phosphorus level-induced aortic calcification in CKD.

scholarly journals Influence of High Phosphorus Levels in Caged Layer Diets

1965 ◽  
Vol 44 (5) ◽  
pp. 1249-1253 ◽  
Author(s):  
R.H. Harms ◽  
B.L. Damron ◽  
P.W. Waldroup
Keyword(s):  
High Phosphorus ◽  
Phosphorus Levels

scholarly journals Correlation between hypophosphatemia and the severity of Corona Virus Disease 2019 patients

2020 ◽  
Author(s):  
Xiaobo Xue ◽  
Jing Ma ◽  
Yuxia Zhao ◽  
Aibin Zhao ◽  
Xiaohong Liu ◽  
...  
Keyword(s):  
Virus Disease ◽  
Common Type ◽  
Serum Phosphorus ◽  
Phosphorus Level ◽  
Serum Phosphorus Level ◽  
Absolute Value ◽  
Corona Virus ◽  
Significant Difference ◽  
Critical Patients ◽  
Phosphorus Levels

AbstractObjectiveRetrospectively analyze the clinical data of Corona Virus Disease 2019 (COVID-19) patients and explore the value of serum phosphorus level in evaluating the severity and prognosis of the disease.MethodsCOVID-19 patients transferred from the first emergency ward of Taiyuan fourth people’s Hospital from February 8 to March 3, 2020 were enrolled. The information of general conditions, clinical manifestations, laboratory indexes, nucleic acid detection and treatment were collected. The changes of blood phosphorus level and absolute value of lymphocytes in ordinary and severe/critical patients were recorded and compared.ResultsA total of 32 patients with COVID-19 were collected, including 12 cases of common type and 20 cases of severe/critical type. Before treatment, the serum phosphorus levels of the two groups were significantly lower than the normal level, and the serum phosphorus levels of the severe/critical patients were lower than those of the common type patients (t = 2.767, P < 0.010). After treatment, the serum phosphorus levels of the two groups reached normal, and there was no significant difference between the two groups (t = 0.231, P >0.819). The level of lymphocytes in severe/critical patients was lower than that in normal patients (t = 4.636, P < 0.001) before treatment. After treatment, the absolute value of lymphocytes in the two groups reached normal, and there was no significant difference between the two groups (t=1.208,P=0.237). There was a positive correlation between lymphocytes and serum phosphorus, and the correlation coefficient was 0.479.Conclusionhypophosphatemia is related to the severity of COVID-19, and strengthening the monitoring of serum phosphorus level of COVID-19’s severe/critical patients and correcting hypophosphatemia in time are of significance to improve the prognosis.

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