The relationship between water-soluble P and modified Morgan P: results based on data and chemical modelling.

2016 ◽  
Vol 32 (2) ◽  
pp. 162-171 ◽  
Author(s):  
D. G. Lumsdon ◽  
C. A. Shand ◽  
R. Wendler ◽  
A. C. Edwards ◽  
M. I. Stutter ◽  
...  
Keyword(s):  
Water Soluble ◽  
Water Soluble P ◽  
Chemical Modelling ◽  
Soluble P ◽  
The Relationship

scholarly journals The influence of long-term sewage sludge application on the activity of phosphatases in the rhizosphere of plants

2008 ◽  
Vol 53 (No. 9) ◽  
pp. 375-381 ◽  
Author(s):  
J. Balík ◽  
D. Pavlíková ◽  
V. Vaněk ◽  
M. Kulhánek ◽  
B. Kotková
Keyword(s):  
Sewage Sludge ◽  
Fertilizer Application ◽  
Water Soluble ◽  
Organic Fertilizers ◽  
Lower Content ◽  
Alkaline Phosphatases ◽  
Soil P ◽  
Water Soluble P ◽  
Soluble P

Model experiments using rhizoboxes were carried out in order to evaluate the influence of different plants (wheat, rape) on the changes in water extractable contents of P, the pH/H2O value and the activity of acidic and alkaline phosphatase in soil of plant rhizosphere. For this experiment, a Cambisol with different long-term fertilizing systems was used: (i) control (with no fertilizer application), (ii) sewage sludge, and (iii) manure. A lower content of water-soluble P was observed in close vicinities of root surfaces (up to 2 mm) at all the studied variants. The control (non-treated) variant reflected a significantly lower content of water-soluble P in the rhizosphere compared to the fertilized ones. The activities of the acidic and alkaline phosphatases were significantly higher in the rhizosphere compared to the bulk soil (soil outside the rhizosphere). The long-term application of organic fertilizers significantly increased phosphatase activity; the activity of the acidic phosphatase was significantly higher in the rhizosphere of rape plants compared to wheat. The variant treated with manure exhibited an increased activity of both the acidic and alkaline phosphatases compared to the variant treated with sewage sludge. In the case of the variant treated long-term with sewage sludge, the portion of inorganic P to total soil P content proportionally increased compared to the manure-treated variant. Soil of the rape rhizosphere showed a trend of lower pH/H<sub>2</sub>O value of all variants, whereas the wheat rhizosphere showed an opposite pH tendency.

Water-soluble p-carboxybenzylated beechwood 4-O-methylglucuronoxylan: structural features and properties

2000 ◽  
Vol 42 (2) ◽  
pp. 123-131 ◽  
Author(s):  
A. Ebringerová ◽  
J. Alföldi ◽  
Z. Hromádková ◽  
G.M. Pavlov ◽  
S.E. Harding
Keyword(s):  
Structural Features ◽  
Water Soluble ◽  
Water Soluble P ◽  
Soluble P

A route to virtually unlimited functionalization of water-soluble p-sulfonatocalix[4]arenes

2020 ◽  
Vol 56 (29) ◽  
pp. 4122-4125
Author(s):  
Alexander Gorbunov ◽  
Anna Iskandarova ◽  
Kirill Puchnin ◽  
Valentine Nenajdenko ◽  
Vladimir Kovalev ◽  
...  
Keyword(s):  
Water Soluble ◽  
Reaction Sequence ◽  
Water Soluble P ◽  
Cuaac Reaction ◽  
Soluble P

Diverse narrow-rim derivatives can be easily prepared from p-sulfonatocalix[4]arenes using the propargylation/CuAAC reaction sequence.

Mechanochemical Activation and Characterization of Low-Medium Grade Phosphorite Ore

2013 ◽  
Vol 690-693 ◽  
pp. 3529-3532
Author(s):  
Yu Xing ◽  
Hong Gao ◽  
Yuan Fang Ying ◽  
De Zheng Qu
Keyword(s):  
Mechanochemical Activation ◽  
Planetary Mill ◽  
Water Soluble ◽  
Particle Sizes ◽  
Leaching Rate ◽  
Activation Time ◽  
Activation Effect ◽  
Water Soluble P ◽  
Soluble P

The activation effect of ball-to-powder ratio and activation time on phosphorite ore that takes place in mechanochemical activation has been investigated in present paper, which is carried out in a planetary mill AGO-II. The results show that, particle sizes decreased after activation; the leaching rate of water-soluble P2O5 increased 4.6 percentage as ball-to-powder ratio rose from 8:1 to 40:1; the activated particle of samples has been highly dispersed, while the leaching rate of water-soluble P2O5 reached 10.1% after milling 15 minutes during activation, which was 4 times as high as the un-activated samples. The results show a potential utilization of low-medium grade phosphorite ore with mechanochemical activation directly.

Soil quality as affected by amendments in bean-potato rotations

2011 ◽  
Vol 91 (4) ◽  
pp. 533-542 ◽  
Author(s):  
A. Moulin ◽  
K. Buckley ◽  
K. Volkmar
Keyword(s):  
Soil Quality ◽  
Aggregate Stability ◽  
Soil Surface ◽  
Water Soluble ◽  
Soil Organic C ◽  
Organic C ◽  
Water Soluble P ◽  
Pinto Bean ◽  
Soluble P ◽  
High Concentrations

Moulin, A. P., Buckley, K. E. and Volkmar, K. 2011. Soil quality as affected by amendments in pinto bean-potato rotations. Can. J. Soil Sci. 91: 533–542. The potential for adverse effects on soil quality and erosion in pinto bean–potato rotations is significant due to low levels of residue input to the soil following potatoes or beans, and the effect of tillage on soil structure, particularly in sandy-textured soils typical of the potato-growing area of Manitoba. Soil quality is reduced by low inputs of residue and carbon commensurate with an increase in the proportion of small and unstable aggregates susceptible to erosion. Furthermore N and P concentrations at the soil surface may be affected by various management options including fall cover crops, application of straw and the use of composted manure. In a study conducted at Carberry, MB, from 2000 to 2006, KCl-extractible NO3-N and Olsen P were determined in the fall prior to seeding in each year of the study. Water-soluble P, determined in the fall of 2005 for selected treatments, increased with application of compost. Soil organic C, total N and the proportion of erodible (<0.5-mm diameter) aggregates and stability of aggregates were measured in 2006 for treatments with fall-applied compost, cereal straw, and spring-applied anionic polyacrylamide (PAM). The proportion of erodible aggregates and aggregate stability were not consistently affected by treatment. Application of PAM did not affect stability of wet-sieved aggregates (1.3 to 2.0 mm), but decreased the proportion of small aggregates (<0.5 mm) in 2002. Soil C in the 0– to 5-cm depth increment increased with fall application of composted beef cattle manure. However, no effect was observed on the dry-sieved distribution of aggregates <0.5 mm in diameter. Soil quality, as indicated by an increase in soil organic C, can be improved by application of composted beef cattle manure, but levels of water-soluble P will increase, potentially increasing the risk of high concentrations of P in runoff. This research shows that the addition of compost and straw improves soil quality in terms of soil carbon and aggregate stability in bean–potato rotations. However, the proportion of erodible aggregates also increased, though not to levels that contribute significantly to soil erosion. Compost inputs must be monitored to reduce the potential for high concentrations and runoff of water-soluble P at the soil surface.

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