scholarly journals Hydrophilic Polymers and Wetting Agents Affect Absorption and Evaporative Water Loss

HortScience ◽  
1993 ◽  
Vol 28 (6) ◽  
pp. 633-635 ◽  
Author(s):  
Allyson M. Blodgett ◽  
David J. Beattie ◽  
John W. White ◽  
George C. Elliott
Keyword(s):  
Water Absorption ◽  
Water Content ◽  
Water Loss ◽  
Hydrophilic Polymers ◽  
Wetting Agent ◽  
Hydrophilic Polymer ◽  
Evaporative Water ◽  
Maximum Water ◽  
Maximum Water Content ◽  
Container Capacity

A plantless system using subirrigation was developed to measure water absorption and loss in soilless media amended with hydrophilic polymers, a wetting agent, or combinations of these amendments. Peat-perlite-vermiculite and bark-peat-perlite controls achieved 67% and 52% of container capacity, respectively, after 20 daily irrigation cycles. Maximum water content of amended media was 78% of container capacity. Adding only a hydrophilic polymer did not increase total water content significantly. Adding a wetting agent increased water absorption in both media. However, when hydrophilic polymer and wetting agent were present, the medium absorbed more water than with wetting agent alone. More extractable water was removed from media containing wetting agent. Water loss rate by evaporation was not affected significantly by medium, hydrophilic polymer, wetting agent, or any combination of these variables.

Water loss dynamics in maize hybrids with different genotypes

2005 ◽  
Vol 53 (2) ◽  
pp. 153-159 ◽  
Author(s):  
A. C. Dobos ◽  
G. Szabó
Keyword(s):  
Water Content ◽  
Water Loss ◽  
Environmental Parameters ◽  
Close Correlation ◽  
Water Dynamics ◽  
Maize Production ◽  
Grain Moisture ◽  
Maximum Water ◽  
The Individual ◽  
Maximum Water Content

Tests were made on the water dynamics of water loss in maize at two locations at major maize production areas, Debrecen and Szeged, as a function of the heat sum required up to physiological ripening. The maximum water content was found to vary according to the hybrid and the year. No significant differences were found between the effective heat sums associated with maximum values within a year, the difference being 2-4 calendar days. There was a close correlation between the maximum grain water content and the length of the generative phase for a given hybrid in a given year. Better water supplies (1998) resulted in higher maximum water content values, which indirectly promoted longer and more intensive dry matter incorporation. Of all the environmental parameters, the drying down rate is primarily determined by the temperature. The changes in grain moisture content in a specific hybrid can be characterised by a joint linear graph. The drying down rate of the individual hybrids was determined by examining the b term of the linear equation.

Study of Water Stability of AC and SMA Asphalt Mixture Based on Water Content

2012 ◽  
Vol 457-458 ◽  
pp. 435-438
Author(s):  
Xue Dong Guo ◽  
Cao Jian ◽  
Xiang Yang Fang
Keyword(s):  
Tensile Strength ◽  
Water Content ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Splitting Tensile Strength ◽  
Water Stability ◽  
Paper Study ◽  
Saturated Condition ◽  
Maximum Water ◽  
Maximum Water Content

In this paper，study water content and water stability of AC and SMA asphalt mixtures, and reach the following conclusions. In the normal saturated condition, the maximum water content of AC and SMA asphalt mixture is 0.28% and 0.32%.And in the vacuum saturated condition, the maximum water content of AC and SMA asphalt mixture is 0.8% and 0.78%.The water of AC and SMA asphalt mixture separately take 8 days and 9 days to drain completely in the normal saturated condition. But in the vacuum saturated condition, the time is more than two months. In different water content conditions, the splitting tensile strength of AC asphalt mixture is 0%> 100%> 25%> 75%> 50%.But the splitting tensile strength of SMA asphalt mixture is 0%> 100%> 25%> 50%> 75%.

scholarly journals Evaluation of the Moisture Change Ability of Selected Crop Seeds

2017 ◽  
Vol 21 (1) ◽  
pp. 59-68
Author(s):  
Krzysztof Kornarzyński ◽  
Bożena Gładyszewska
Keyword(s):  
Water Absorption ◽  
Water Content ◽  
Broad Bean ◽  
Moisture Change ◽  
Weighting Method ◽  
Plant Seeds ◽  
Second Stage ◽  
Maximum Water ◽  
Varied Size ◽  
The Moment

Abstract The objective of the paper was to investigate the moisture change ability of bean, broad bean, pea, lupine, radish, beetroot, winter wheat, maize, cucumber, pumpkin and sunflower seeds. Seeds absorbed water in the system for measurement of the water absorption kinetics with the capillary and weighting method. The research results were presented in the form of plots of the relation of kinetics of the moisture change of seeds in the time for the first and second stage of the process which precedes germination. Moreover, the water content in seeds for the time of the end of the second stage of water absorption was determined and the maximum water absorption speed coefficient and the time of its obtaining was calculated. The water content for the end of the 2nd stage of its collection was the highest for seeds which include a hard caryopsis and for broad bean plant seeds. The maximum water absorption speed coefficient was the highest for seeds with low initial moisture - radish, beetroot, cucumber and pumpkin. The measurement of the water absorption speed with the use of the capillary and weighting method enabled investigation of seeds with a varied size, construction of a seed coat and chemical composition for a long period of time to the moment seedlings were obtained.

The Influence of Temperature and Moisture on the Uptake and Loss of Water in the Eggs of Gryllulus Commodus Walker (Orthoptera--Gryllidae)

1953 ◽  
Vol 30 (1) ◽  
pp. 104-115
Author(s):  
T. O. BROWNING
Keyword(s):  
Relative Humidity ◽  
Water Uptake ◽  
Water Loss ◽  
Initial Period ◽  
Influence Of Temperature ◽  
Stage Of Development ◽  
Original Weight ◽  
Maximum Water ◽  
Diapause Development ◽  
Maximum Water Content

1. Eggs placed on moist plaster took up water slowly at first and then more rapidly until they had reached their maximum water content. The duration of the initial period of slow water uptake was dependent upon temperature, becoming shorter as the temperature was raised. Similarly the duration of the period of rapid water uptake decreased with temperature. 2. No special water-absorbing structure was identified in the eggs of Gryllulus. 3. The rate of water loss from newly laid eggs was more rapid at higher than at lower temperatures under conditions of constant atmospheric saturation deficiency. 4. Newly laid eggs died if they lost more than about 20% of their original weight. 5. At 90% relative humidity, eggs which had completed water uptake lost water at a higher rate at high than at lower temperatures. The rate of water loss was also dependent on the stage of development of the embryo. 6. Eggs that had completed diapause development at 13° C. and had completed water uptake were able to lose about 30% of their weight through desiccation without being killed, but many of those that lost more than about 20% of their weight failed to develop when replaced on moist plaster; it seemed as if they had entered a state resembling diapause.

The Evaporation of Water from Helix Aspersa

1964 ◽  
Vol 41 (4) ◽  
pp. 759-769
Author(s):  
JOHN MACHIN
Keyword(s):  
Water Content ◽  
Water Loss ◽  
Vapour Pressure ◽  
Freezing Point ◽  
Muscular Activity ◽  
Helix Aspersa ◽  
Distilled Water ◽  
Atmospheric Conditions ◽  
Evaporative Water ◽  
Dry Air

1. Observations of intact specimens of Helix aspersa together with experiments with isolated skin preparations are described. 2. Under normal atmospheric conditions increases in haemocoelic pressure, probably due to general muscular activity, are sufficient to maintain the superficial mucous coating of the skin. 3. Under conditions of rapid water loss more intense muscular undulations serve to spread mucus which collects in the grooves to more exposed areas of the skin. 4. The water content, the rate of water loss in dry air, the equilibrium in saturated air and depression of freezing point of isolated mucus samples have been measured. 5. The vapour pressure of mucus has been shown to be within 0.4% of that of distilled water under the same conditions. 6. The significance of the above findings is discussed in relation to evaporative water loss and water uptake of an intact snail.

Evidence from feldspar compositions of high temperatures in granite sheets in the Scourian complex, N.W. Scotland

1982 ◽  
Vol 46 (338) ◽  
pp. 73-76 ◽  
Author(s):  
Hugh R. Rollinson
Keyword(s):  
Critical Temperature ◽  
Water Content ◽  
Bulk Composition ◽  
Alkali Feldspar ◽  
Granulite Facies ◽  
Granulite Facies Metamorphism ◽  
Critical Composition ◽  
Facies Metamorphism ◽  
Maximum Water ◽  
Maximum Water Content

AbstractMesoperthite feldspars from hypersolvus granites, with granulite-facies mineralogy from the Scourian complex, N.W. Scotland have an average bulk composition of (Ab0.58Or0.42)88An12. The mesoperthites have an Ab/Or ratio close to the critical composition of the alkali feldspar solvus for anorthite-free compositions. The critical temperature of the ternary feldspar solvus is estimated at high anorthite contents and used to indicate a temperature in excess of 1000°C for the crystallization of the granite sheets prior to granulite-facies metamorphism and permits a maximum water content in the melt of 1%.

Uing DSC Technology for Water Content and Thermal Properties Analysis of Carassius Organs

2011 ◽  
Vol 374-377 ◽  
pp. 1050-1053
Author(s):  
Peng Zeng ◽  
Tian Ji Chen ◽  
Jiang Shen
Keyword(s):  
Heat Capacity ◽  
Thermal Properties ◽  
Specific Heat ◽  
Water Content ◽  
Freezing Temperature ◽  
Maximum Water ◽  
Temperature Equilibrium ◽  
Freeze Water ◽  
Ventral Muscle ◽  
Maximum Water Content

Thermal properties of Brain, gill, hepatopancreas, muscle and blood of Carassius living in 8°C were investigated by differential scanning calorimeter. Between 20°C～-40°C , blood showed lower specific heat capacity than other organs. It might help temperature equilibrium in organism. Blood and brain had higher freezing temperature. Brain showed the maximum water content but less freeze water while ventral muscle had the lowest water content but high freeze-able water. Hepatopancreas had both low water and freeze-able water content.

scholarly journals Branches and Leaves Growth Patterns in Myricaria laxiflora Remnant Populations Are Affected by Human-altered Water Level Fluctuations

2020 ◽  
Author(s):  
Shoupeng Guan ◽  
Fang-Qing Chen ◽  
Jumei Zhou ◽  
Yongwen Huang ◽  
Dayong Fan
Keyword(s):  
Water Content ◽  
Water Level ◽  
Plant Height ◽  
Growth Traits ◽  
Leaf Growth ◽  
Water Level Fluctuations ◽  
Middle Region ◽  
Lower Region ◽  
Maximum Water ◽  
Maximum Water Content

Abstract Background: The construction of the Three Gorges-Gezhou Dam altered the water level fluctuation pattern in the downstream habitat of the endangered species Myricaria laxiflora. This study investigated how branch and leaf growth traits of M. laxiflora remnant populations changed to adapt the environmental stress caused by human-altered water level fluctuations.Results:Due to such disturbance, branch and leaf growth traits of M. laxiflora populations exhibited significant differences across water level conditions. The number of secondary branches, plant height, and leaf number of the plants in the upper area of the habitat were significantly higher than that in the middle and lower river bank areas. The longest secondary branch length of the plants in the upper and middle region was significantly higher than that in the lower region. The branch and leaf volume of plants in the middle region was significantly higher than that in the upper and lower region. The maximum water content of plants in the middle and lower region was significantly higher than that in the upper region. Principal component analysis showed that the branch and leaf traits of plants changed with decreasing water level toward to decreasing plant height, leaf number and the number of secondary branches, and increasing maximum water content of branch and leaves. Conclusions: The phenotypic plasticity of M. laxiflora plants in branch and leaf growth traits alleviates the impacts of human-regulated water level fluctuations. However, the above ground growth of M. laxiflora plants distributed at the middle and lower areas of the fluctuation zone is still negatively affected.

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