scholarly journals The Effect of Molybdenum on the Organic and Inorganic Phosphorus of Plants

1954 ◽  
Vol 7 (3) ◽  
pp. 221 ◽  
Author(s):  
JV Possingham
Keyword(s):  
Total Phosphorus ◽  
Dry Matter ◽  
Marked Effect ◽  
Organic Phosphorus ◽  
Inorganic Phosphorus ◽  
Absolute Amount ◽  
Phosphorus Metabolism ◽  
Tomato Plants ◽  
The Absolute

Molybdenum, applied 2 days before harvest, had a marked effect on the phosphorus metabolism of molybdenum-de�cient tomato plants grown in waterculture solutions. The molybdenum increased the concentration of organic phosphorus, with a corresponding decrease in the concentration of inorganic phosphorus. Molybdenum increased the yield of dry matter, the absolute amount of phosphorus, and the absolute amount of organic phosphorus; but did not increase the absolute amount of inorganic phosphorus. The concentration of total phosphorus did not change.

scholarly journals Effect on a peat soil of application of superphosphate at various rates

1959 ◽  
Vol 31 (1) ◽  
pp. 120-130
Author(s):  
Armi Kaila
Keyword(s):  
Total Phosphorus ◽  
Dry Matter ◽  
Phosphorus Content ◽  
Organic Phosphorus ◽  
Peat Soil ◽  
Available Phosphorus ◽  
Untreated Soil ◽  
Total Phosphorus Content ◽  
Low Phosphorus ◽  
Better Than

The effect on a fen soil of superphosphate applied for 34 years at the annual rates of 0, 100, 200, and 300 kg/ha was studied. The material consisted of samples from a field trial at the Leteensuo Experiment Station. The soil samples from the ploughing layer were collected in autumn 1956, and the hay samples from the crop harvested in 1957. The hay yields from the treatments with 200 or 300 kg/ha of superphosphate were about 7400 kg/ha, and the phosphorus content of the hay 1.69 and 1.85 per cent, respectively. The treatment with 100 kg/ha of superphosphate yielded only about 5100 kg/ha of hay dry matter with a very low phosphorus content, 0.96 per cent. The yield from the untreated plots was almost negligible. Also the biological and chemical soil tests showed that the untreated soil was almost depleted of available phosphorus. The phosphorus conditions in the soil annually treated with 100 kg/ha of superphosphate were not significantly better than in the untreated soil. An annual anplication of 200kg/ha of superphosphate was able to maintain a more satisfactory rate of available phosphorus in the soil, but only the treatment with 300 kg/ha of superphosphate resulted in markedly higher test values than those for the lower treatments. The total phosphorus content of the soil was the higher the larger the amount of superphosphate applied. About 40 to 50 per cent of the differences between the total phosphorus content of the treated and untreated samples was due to organic phosphorus. The potassium content of the hay was the lower the higher the superphosphate treatment. The hay from the treatment with 300 kg/ha of superphosphate contained only 1.25 per cent potassium. The possibility that potassium was a minimum factor in this treatment was discussed.

Influence of substrate depth and particle size on phosphorus removal in a surface flow constructed wetland

2017 ◽  
Vol 75 (10) ◽  
pp. 2291-2298 ◽  
Author(s):  
Cui Lijuan ◽  
Li Wei ◽  
Zhou Jian ◽  
Zhang Yan ◽  
Zhang Manyin ◽  
...  
Keyword(s):  
Particle Size ◽  
Constructed Wetlands ◽  
Total Phosphorus ◽  
Constructed Wetland ◽  
Organic Phosphorus ◽  
Subsurface Layer ◽  
Iron Phosphate ◽  
Inorganic Phosphorus ◽  
Surface Flow ◽  
Phosphorus Adsorption

Substrate adsorption is one of the main processes by which redundant phosphorus is removed from wastewater in surface flow constructed wetlands (SFCWs). The physical properties of the substrate, such as depth and particle size, will influence the amount of phosphorus adsorption. This study was carried out in a long-running intermittent inflow constructed wetland that covered a total area of 940.4 m2 in the Shunyi District of Beijing, China. We investigated how the concentrations of four phosphorus fractions, namely calcium phosphate (CaP), iron phosphate (FeP), adsorbed phosphorus (AdsP), and organic phosphorus (OP), varied between the surface (0–10 cm) and subsurface (10–20 cm) substrate and among the different substrate particle sizes. The total phosphorus concentrations in the substrate ranged from 154.97 to 194.69 mg/kg; CaP accounted for more than 80% of the total phosphorus content. The concentrations of OP were significantly higher in the surface layer than in the subsurface layer, but the concentrations of inorganic phosphorus were not significantly different between the two layers. The CaP, AdsP, and OP adsorption capacities were greater for small-sized substrate particles than for large-sized substrate particles. The results from this study provide a theoretical basis for the construction of constructed wetlands.

The effects of phytase supplementation on nutrient digestibility, plasma parameters, performance and carcass traits of pigs fed diets based on low-phytate barley without inorganic phosphorus

2006 ◽  
Vol 86 (2) ◽  
pp. 245-254 ◽  
Author(s):  
P. A. Thacker ◽  
B. G. Rossnagel ◽  
V. Raboy
Keyword(s):  
Total Phosphorus ◽  
Organic Phosphorus ◽  
Inorganic Phosphorus ◽  
Positive Control ◽  
Nutrient Digestibility ◽  
Dicalcium Phosphate ◽  
Feed Conversion ◽  
Plasma Parameters ◽  
Phytate Phosphorus ◽  
Fecal Phosphorus

A total of 80 crossbred pigs (25.5 ± 2.6 kg) were assigned to one of eight dietary treatments. A positive control, based on Harrington barley, was formulated to meet requirements for total phosphorus. Three experimental diets (low in total phosphorus) were formulated based on either Harrington barley (0.28% phytate phosphorus) or the low phytate genotypes LP422 (0.14% phytate phosphorus) and LP 635 (0.09% phytate phosphorus). The four diets were fed with and without 1000 FTU kg-1 phytase. Calcium and phosphorus digestibility were significantly higher (P < 0.05) as a result of supplementation with phytase. For the barley diets formulated without dicalcium phosphate, calcium digestibility averaged 69.6, 73.3 and 72.2% while phosphorus digestibility averaged 36.5, 50.5 and 57.7% for pigs fed the Harrington, LP 422 and LP 635 diets, respectively. The addition of phytase to the diet consistently reduced the percentage of phosphorus excreted in feces and fecal phosphorus excretion declined as the level of phytate in the barley declined. The addition of phytase tended to improve weight gain (P < 0.10) and significantly improved feed conversion (P < 0.05). For pigs fed the barley diets formulated without dicalcium phosphate, daily gain averaged 0.90, 0.99 and 1.01 kg d-1 while feed conversion averaged 2.70, 2.39 and 2.38 for the Harrington, LP 422 and LP 635 diets, respectively. The overall results of this experiment indicate that the performance of pigs fed diets containing low-phytate barley formulated without a source of inorganic phosphorus is at least equal to that of pigs fed diets containing normal-phytate barley and inorganic phosphorus. In addition, the increased availability of organic phosphorus reduced the amount of phosphorus excreted thus reducing the amount of phosphorus that can potentially pollute the environment. Key words: Low phytate barley, phytase, pigs, performance, digestibility

Sheep faeces in relation to the phosphorus cycle under pastures

1961 ◽  
Vol 12 (1) ◽  
pp. 111 ◽  
Author(s):  
SM Bromfield
Keyword(s):  
Total Phosphorus ◽  
Inorganic Phosphate ◽  
Phosphorus Content ◽  
Organic Phosphorus ◽  
Subterranean Clover ◽  
Inorganic Phosphorus ◽  
Sheep Grazing ◽  
Phosphorus Cycle ◽  
Soil Organic Phosphorus ◽  
Pot Culture

Faeces from sheep grazing naturalDanthonia pastures and improved subterranean clover pastures have been analysed for total phosphorus and inorganic phosphate over a period of 2 years. Both total and inorganic phosphorus contents (milligrams P per gram) varied widely with type of pasture and with season. The variation in organic phosphorus content (by difference) remained, relative to total phosphorus, fairly constant throughout. Total phosphorus content varied from 1.8 to 17 mg P/g whilst organic phosphorus varied from 1.5 to 4.0 mg P/g. Sheep grazing the improved pastures voided approximately 2.5–3 lb P as inorganic phosphate and 0.5–0.75 lb P as organic phosphorus per sheep per year. The inorganic phosphate was readily soluble in acid but not in water and was readily available to wheat grown in pot culture. The organic phosphorus was not readily available to plants and was not rapidly mineralized to inorganic phosphate. The contribution faecal phosphorus makes to the nutrition of pastures and to the reserve of soil organic phosphorus is briefly discussed.

THE USE OF 8-HYDROXY QUINOLINE (OXINE) IN THE EXTRACTION OF SOIL ORGANIC PHOSPHORUS

1959 ◽  
Vol 39 (1) ◽  
pp. 20-26 ◽  
Author(s):  
G. W. Boswall ◽  
W. A. Delong
Keyword(s):  
Total Phosphorus ◽  
Organic Phosphorus ◽  
Clay Content ◽  
Calcium Content ◽  
Inorganic Phosphorus ◽  
Laboratory Procedure ◽  
Soil Organic Phosphorus ◽  
Hydroxy Quinoline ◽  
Water Ratio

A mild laboratory procedure, employing oxine in a water-benzene system, for the release of organic phosphorus from two unimproved pasture soils differing widely in total phosphorus, ratio of organic to inorganic phosphorus, pH, calcium content and clay content, is described.Data are presented showing the influence of the following factors on the amount of phosphorus released: soil to water ratio, the pH of the extraction medium, and the soil pretreatments. Under the more favourable conditions the two soils released 75 and 86 per cent of their total organic phosphorus respectively.

scholarly journals Phosphorus in various depths of some virgin peat lands

1956 ◽  
Vol 28 (1) ◽  
pp. 90-104
Author(s):  
Armi Kaila
Keyword(s):  
Total Phosphorus ◽  
Phosphorus Content ◽  
Organic Phosphorus ◽  
Total Content ◽  
Inorganic Phosphorus ◽  
Point Of View ◽  
Phosphorus Compounds ◽  
Surface Layers ◽  
P Content ◽  
As Solubility

In the present paper results are reported concerning the total content as well as solubility of organic and inorganic phosphorus in 122 peat samples which were collected from various depths of 30 peat lands. The total phosphorus content of all the samples was rather low and no regularity in the influence of the depth upon this quantity could be demonstrated. There seemed to be some tendency to an increase in the P-content with increasing depth in the peat lands of lower quality. In peat lands of higher quality the opposite often held true. A large part of the phosphorus occurred in organic form, and, almost without exception, this percentage of total phosphorus increased with the depth: in undecomposed plant material this proportion was about 50—60 per cent, in the surface layers 70 per cent, on the average, in deposits deeper than 50 cm seldom less than 80 per cent and it could even reach 95 per cent. 1he amount of organic phosphorus expressed as a percentage of organic dry matter was low in most of the samples and although it tended to increase with the depth only in 11 of all the 122 samples values higher than 0.1 per cent were obtained. Even if an allowance is made for the conditions prevailing in peat lands these low percentages of organic phosphorus indicate that, from the microbiological point of view, no rapid mineralization of the organic phosphorus compounds is probable. The inorganic phosphorus content was low and tended to decrease from the surface to deeper layers. The solubility of inorganic phosphorus, however, dropped much more drastically. Thus in the deeper layers the amount of easily extractable inorganic phosphorus could be negligible. The solubility of organic phosphorus also impaired with the depth. The phosphorus economy of peat lands was discussed on the basis of the results obtained.

Foliar concentrations and resorption of nitrogen and phosphorus in 15 species of eucalypts grown under non-limited water and nutrient availability

2000 ◽  
Vol 48 (5) ◽  
pp. 597 ◽  
Author(s):  
B. Hawkins ◽  
P. J. Polglase
Keyword(s):  
Total Phosphorus ◽  
Organic Phosphorus ◽  
Soil Phosphorus ◽  
Inorganic Phosphorus ◽  
Leaf Nitrogen ◽  
Phosphorus Use Efficiency ◽  
Nitrogen And Phosphorus ◽  
Foliar Phosphorus ◽  
Foliar Concentrations ◽  
Nutrient Amendment

Mature and senescent foliage were sampled from 15 species of Eucalyptus, covering three subgenera, Symphyomyrtus, Monocalyptus and Corymbia, under non-limiting availability of water and nutrients (effluent-irrigated plantation). Concentrations of total phosphorus in mature foliage were relatively high for Eucalyptus (range 1.6–3.1 mg g–1), inorganic phosphorus accounting for 60–79% of total phosphorus. Foliar concentrations of total and inorganic phosphorus in Monocalyptus were about twice as much as in Symphyomyrtus. Concentrations of nitrogen did not differ amongst subgenera. About 50% of leaf nitrogen was resorbed during senescence. In contrast, about 11–24% of phosphorus was resorbed, of which about 48–77% was derived from hydrolysis of organic phosphorus. There were no significant differences amongst subgenera in resorption of either nitrogen or phosphorus. Despite significant variability in nutritional characteristics within subgenera, we conclude that Monocalyptus has a greater capacity to accumulate foliar phosphorus (as inorganic phosphorus) than Symphyomyrtus, but that Symphyomyrtus has a greater phosphorus-use efficiency (ratio of growth to foliar phosphorus). Foliar inorganic phosphorus appears to be easily manipulated by nutrient amendment whereas nitrogen is highly resistant. Resorption efficiency of phosphorus (proportion of total phosphorus resorbed) is decreased under high availability of soil phosphorus.

scholarly journals Spatial Variations in the Abundance and Chemical Speciation of Phosphorus across the River–Sea Interface in the Northern Beibu Gulf

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 1103 ◽  
Author(s):  
Bin Yang ◽  
Zhen-Jun Kang ◽  
Dong-Liang Lu ◽  
Solomon Dan ◽  
Zhi-Ming Ning ◽  
...  
Keyword(s):  
Total Phosphorus ◽  
Coastal Waters ◽  
Organic Phosphorus ◽  
Inorganic Nitrogen ◽  
Inorganic Phosphorus ◽  
Particulate Phosphorus ◽  
Beibu Gulf ◽  
Phosphorus Species ◽  
Dissolved Phosphorus ◽  
Dissolved Inorganic Phosphorus

Water samples were collected to measure dissolved and particulate phosphorus species in order to examine the dynamics of phosphorus in the water column across the river–sea interface from the lower Dafengjiang River to the open Beibu Gulf. Dissolved inorganic phosphorus concentrations were as high as 0.90 ± 0.42 μM in river water but decreased dramatically to as low as 0.02 ± 0.01 μM in open coastal waters. Total dissolved phosphorus was largely measured in the form of dissolved inorganic phosphorus in river waters (58% ± 18%), whereas dissolved organic phosphorus became the predominant species (>90% on average) in open coastal waters. Total dissolved phosphorus was the dominant species, comprising 76% ± 16% of the total phosphorus, while total particulate phosphorus only comprised 24% ± 16% of the total phosphorus pool. Riverine inputs, physical and biological processes, and particulate phosphorus regeneration were the dominant factors responsible for the dynamic variations of phosphorus species in the study area. Based on a two-end-member mixing model, the biological uptake resulted in a dissolved inorganic phosphorus depletion of 0.12 ± 0.08 μM in the coastal surface water, whereas the replenishment of dissolved inorganic phosphorus in the lower river from particle P regeneration and release resulted in an increase (0.19 ± 0.22 μM) of dissolved inorganic phosphorus in the estuarine mixing region. The molar ratios of dissolved inorganic nitrogen to dissolved inorganic phosphorus and dissolved silicate to dissolved inorganic phosphorus in the open surface waters were >22, suggesting that, although the lower Dafengjiang River contained elevated concentrations of dissolved inorganic phosphorus, the northern Beibu Gulf was an overall P-limited coastal ecosystem.

scholarly journals Effects of Soil Conditioners on Absorption of phosphorus by waxy corn and Phosphorus Transformation in High Phosphorus Soils

2020 ◽  
Vol 143 ◽  
pp. 02024
Author(s):  
Wang Xi ◽  
Lu Shuchang ◽  
Pei Zhiqiang ◽  
Hou Kun ◽  
Ya Zongjie ◽  
...  
Keyword(s):  
Humic Acid ◽  
Total Phosphorus ◽  
Phosphorus Content ◽  
Organic Phosphorus ◽  
Soil Phosphorus ◽  
Inorganic Phosphorus ◽  
Total Phosphorus Content ◽  
The Third ◽  
Phosphorus Accumulation ◽  
Waxy Corn

In this experiment, the effects of different types of conditioners and their application on the absorption and transformation of phosphorus in high phosphorus soils in facilities were investigated to improve the environmental problems of protected farmland caused by phosphorus accumulation. Waxy corn was used as a test crop, and five conditioners such as humic acid, biochar, bentonite, alum, and dephosphorized gypsum were used as test materials for potting experiments. The experiment set 10 treatments, namely T1(Blank control), T2(Humic acid), T3(Biochar), T4(Bentonite), T5(Alum), T6 (Dephosphorized gypsum), T7(Biochar-bentonite-alum), T8(Humic acid-biochar-alum),T9(Humic acidbiochar- bentonite-alum),T10(Humic acid-bentonite-biochar-alum-dephosphorized gypsum). Based on the analysis of the results of the three crops, except that the first crop was not significant, the biomass and phosphorus absorption of waxy corn of T2 was the highest in the second crop, and T10 was the most effective treatment in the third crop. The soil available phosphorus content of T8 was the lowest in the second crop and that of T10 was the lowest in the third crop, which were 12.01% and 12.75% lower than the control. The soil water-soluble phosphorus content of T4 was the lowest in the second crop, which was 41.84% lower than the control, and that of T8 was the lowest in the third crop, which was 26.62% lower than the control. According to the results of the three crops, the ratio of the total phosphorus content of the inorganic phosphorus in the third crop of each treatment was increasing compared with the first crop. The soil phosphorus was transformed from organic phosphorus to inorganic phosphorus. The ratio of total phosphorus content of organic phosphorus of T6, T9, T10 was larger than other treatments, which slowed down the conversion of phosphorus to available form. The ratio of Ca8-P in the inorganic phosphorus was the highest, reaching about 50% to 60%. From the results and analysis, T2 and T10 were beneficial to the absorption of soil phosphorus by waxy corn, T8 and T10 were beneficial to slow down the conversion of phosphorus to the effective state, reduce the potential risk of phosphorus environment, improve the phosphorus accumulation environmental issues in greenhouse farmland.

Relationships among macro-minerals, other selected serum markers of bone profile and milk components of dairy cows during late-lactation

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ryszard Mordak ◽  
Zbigniew Dobrzański ◽  
Robert Kupczyński
Keyword(s):  
Dairy Cows ◽  
Milk Fat ◽  
Dry Matter ◽  
Inorganic Phosphorus ◽  
Serum Markers ◽  
Laboratory Diagnostics ◽  
Lactation Period ◽  
Milk Samples ◽  
Milk Components ◽  
Macro Mineral

AbstractTesting blood and milk parameters as well as analysing the relationships among these markers is very useful for monitoring the internal homeostasis and health in high-yielding dairy cows during various production periods. The aim of the study was to assess the correlations (relationships) among macro-minerals, such as calcium (Ca), inorganic phosphorus (P), magnesium (Mg), other selected bone profile markers, such as total protein (TP), albumin, activity of alkaline phosphatase (ALP) measured in serum and selected milk components such as number of somatic cells (SCC), colony-forming units (CFU), milk fat (MF), milk protein (MP), milk lactose (ML), dry matter (DM), non-fat dry matter (FDM) and milk production in late-lactation cows. Both blood and milk samples were collected from 11 clinically healthy milking cows during the late-lactation period. The cows were examined once a day for 3 consecutive days resulting in 33 sets of blood and milk samples for laboratory and statistical analysis. Significant correlations were observed between: Mg and MP, Mg and FDM, ALP and SCC, TP and SCC, TP and MP, TP and FDM, albumin and MP, albumin and FDM, P and Mg, Mg and albumin, and between TP and albumin. When monitoring macro-mineral homeostasis and mammary gland health, especially in intensively fed high-yielding dairy cows correlations between these markers should be considered. The revealed correlations can allow for deeper comparative laboratory diagnostics of homeostasis and can be especially useful for laboratory monitoring of the potential risk of subclinical macro-mineral deficiency in high-yielding dairy cows.

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