scholarly journals Optimal Growing Substrate pH for Five Sedum Species

HortScience ◽  
2013 ◽  
Vol 48 (4) ◽  
pp. 448-452 ◽  
Author(s):  
Youbin Zheng ◽  
Mary Jane Clark
Keyword(s):  
Regression Models ◽  
Specific Growth ◽  
Dry Weight ◽  
Growth Responses ◽  
Dragon’S Blood ◽  
Ph Values ◽  
Ph Range ◽  
Species Specific ◽  
Substrate Ph ◽  
Weight Regression

To determine the optimal growing substrate pH values for Sedum plants, Sedum album, Sedum reflexum ‘Blue Spruce’, Sedum spurium ‘Dragon’s Blood’, Sedum hybridum ‘Immergrunchen’, and Sedum sexangulare were grown in containers using peatmoss and perlite-based substrates at five target pH levels (i.e., 4.5, 5.5, 6.5, 7.5, and 8.5). Optimal pH levels, calculated from dry weight regression models, were 6.32, 6.43, 5.71, 6.25, and 5.91 for S. album, S. reflexum, S. spurium, S. hybridum, and S. sexangulare, respectively, and 5.95 overall. Sedum spurium dry weight varied the most among pH treatments (i.e., 9.5 times greater at pH 6.3 vs. 8.3), whereas S. reflexum varied the least (i.e., 1.3 times greater at pH 6.3 vs. 4.4), indicating species-specific growth responses to growing substrate pH. These findings identified a narrow range of optimal growing substrate pH levels within a wider pH range tolerated by five Sedum spp. Therefore, by adjusting substrate pH to optimal levels, Sedum growth can be maximized.

scholarly journals Effects of pH and Aeration on Sclerotium rolfsii sacc. Mycelial Growth, Sclerotial Production and Germination

2018 ◽  
Vol 7 (3) ◽  
pp. 123-129 ◽  
Author(s):  
Fakher Ayed ◽  
Hayfa Jabnoun-Khiareddine ◽  
Rania Aydi-Ben-Abdallah ◽  
Mejda Daami-Remadi
Keyword(s):  
Mycelial Growth ◽  
Sclerotium Rolfsii ◽  
Dry Weight ◽  
Ph Values ◽  
Effects Of Ph ◽  
Ph Range ◽  
Sclerotial Development ◽  
Sclerotial Germination

Sclerotium rolfsii is one of the devastating soilborne fungus responsible for significant plant losses. The effects of pH and aeration on pathogen mycelial growth, sclerotial production and germination were investigated for three Tunisian isolates. Optimal mycelial growth occurred at pH 6 for Sr2 and Sr3 isolates and at pH 6-7 for Sr1. Dry mycelial growth was optimum at pH values ranging between 4 and 7. Sclerotial initiation started on the 3rd day of incubation at all pH values tested and mature sclerotia were formed after 6 to 12 days. Optimal sclerotial production was noted at pH 5. The dry weight of 100 sclerotia varied depending on isolates and pH and occurred at pH range 4-7. At pH 9, mycelial growth, sclerotial production and dry weight of 100 sclerotia were restricted. The optimum sclerotial germination, noted after 24 h of incubation, varied depending on isolates and pH and occurred at pH 4-9. Mycelial growth was optimum in aerated plates with a significant isolates x aeration treatments interaction. Sclerotial initiation occurred at the 3rd day of incubation and mature sclerotia were observed after 6-9 days. Sclerotial development was very slow in completely sealed plates and dark sclerotia were produced only after 15 days of incubation. The highest sclerotial yields were noted in aerated plates. The highest dry weight of 100 sclerotia for Sr1 isolate was recorded in ½ sealed, no sealed and completely sealed plates, while for Sr2, it was noted in ½ and ⅔ sealed plates. For Sr3, the maximum dry weight of 100 sclerotia was recorded in ½, ⅔ and completely sealed plates. Germination of S. rolfsii sclerotia, after 24 h of incubation, did not vary significantly depending on aeration treatments and ranged from 90 to 100% for all isolates.

Species-Specific Growth Responses to Climate Variations in Understory Trees of a Central African Rain Forest

Biotropica ◽  
2010 ◽  
Vol 42 (4) ◽  
pp. 503-511 ◽  
Author(s):  
Camille Couralet ◽  
Frank J. Sterck ◽  
Ute Sass-Klaassen ◽  
Joris Van Acker ◽  
Hans Beeckman
Keyword(s):  
Rain Forest ◽  
Specific Growth ◽  
Climate Variations ◽  
Growth Responses ◽  
Species Specific ◽  
Understory Trees

Species-specific growth responses of favositid corals to soft-bottom substrates

Lethaia ◽  
1989 ◽  
Vol 22 (3) ◽  
pp. 287-299 ◽  
Author(s):  
MICHAEL A. GIBSON ◽  
THOMAS W. BROADHEAD
Keyword(s):  
Specific Growth ◽  
Growth Responses ◽  
Soft Bottom ◽  
Species Specific

scholarly journals High pressure inactivation of Enterococcus faecium – modelling and verification

2009 ◽  
Vol 27 (No. 2) ◽  
pp. 134-141 ◽  
Author(s):  
A. Landfeld ◽  
J. Strohalm ◽  
K. Kýhos ◽  
J. Průchová ◽  
M. Houška ◽  
...  
Keyword(s):  
High Pressure ◽  
Human Milk ◽  
Enterococcus Faecium ◽  
Saline Solution ◽  
Cow Milk ◽  
Resistant Organism ◽  
Ph Values ◽  
Ph Range ◽  
Saline Solutions ◽  
Substrate Ph

High-pressure inactivation data were obtained for model working suspensions of <I>Enterococcus faecium</I> in saline solutions in pH range from 5.5 to 6.8, at water activity 0.99 (corresponding to the saline solution). The data were predicted for the pressure range of 450 MPa to 550 MPa, at the initial model suspension temperature 6–7°C prior to pressurising. The results indicate that <I>E. faecium</I> is a highly resistant organism under physiological pH values. With decreasing the substrate pH, the tolerance to the inactivation effects of high pressure decreased. The high-pressure inactivation proved ineffective for the above organism in the range of physiological pH values. The values for high-pressure inactivation model were specified and the calculated parameters of high-pressure inactivation were compared to the experimental data for the working suspensions of <I>E. faecium</I> in cow and human milks. As to cow milk, the predicted data showed some deviation from the model experimental results, while with human milk the model failed completely. High-pressure inactivation of <I>E. faecium</I> in human milk proved to be significantly more effective than that predicted by a model based on the saline solution.

scholarly journals Effect of Different Commercial Substrates on Growth of Petunia Transplants

2016 ◽  
Vol 26 (4) ◽  
pp. 507-513
Author(s):  
Yuqi Li ◽  
Neil S. Mattson
Keyword(s):  
Growth Period ◽  
Dry Weight ◽  
Water Source ◽  
Ammonium Nitrogen ◽  
Clear Water ◽  
Flower Number ◽  
Ph Values ◽  
Shoot Dry Weight ◽  
Substrate Ph ◽  
Over Time

The objective of this study was to evaluate the growth and flowering of petunia (Petunia ×hybrida) transplants in response to seven commercial substrates with two water sources (fertigation and clear water irrigation). Seven commercial substrates used were Sunshine #1 Natural & Organic (SS), Metro-Mix 360 (MM), AgriTech (AT), Cornell Peat-Lite Mix B (CB), Jeff’s Organic (JO), LM-18, and LM-111. The experiment was a completely randomized 2 × 7 factorial design with six single-pot replications per treatment. With fertigation, substrate electrical conductivity (EC) decreased over time to 38 days after transplanting (DAT), and then did not further change. The AT substrate EC value was greater than others during the first 38 DAT. With clear water irrigation, substrate EC decreased over time to 31 DAT, and then did not further change. The AT substrate EC value was greater than other substrates during the entire petunia growth period. With fertigation, all substrate pH values were between 6.5 and 7.5 except AT and CB. The AT substrate had the greatest pH ranging from 7.5 to 8.0 during the petunia growth period. The CB substrate exhibited the lowest pH, which was between 5.8 and 6.3. Clear water irrigation had greater substrate pH values than fertigation. There was a substrate and water interaction for calcium (Ca), potassium (K), ammonium-nitrogen (NH4+-N), nitrate-nitrogen (NO3−-N), and sodium (Na) concentrations in substrate leachate. At 52 DAT, the shoot dry weight (DW), root index (RI), and flower number of petunia grown in AT substrate were greatest among all the substrates, but chlorophyll index (SPAD) was the lowest under either the fertigation or clear water irrigation treatments. The DW and RI of petunia grown in AT substrate were greater when fertigation was used than clear water irrigation, but the water source had no effect on flower number. For SS, MM, CB, JO, LM-18, and LM-111 substrates, fertigation increased petunia DW, RI, and flower number as compared with clear water irrigation, but not SPAD readings.

Producing Blue and Pink Flowers on Hydrangea Using Coal Bottom Ash as a Media Component

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 465b-465
Author(s):  
Bradford C. Bearce ◽  
Dharmalingam S. Pitchay
Keyword(s):  
Quality Index ◽  
Bottom Ash ◽  
Dry Weight ◽  
Dolomitic Lime ◽  
Coal Bottom Ash ◽  
Hydrangea Macrophylla ◽  
Media Component ◽  
Ph Range ◽  
Substrate Ph ◽  
Root Quality

Rooted terminal tip cuttings of hydrangea (Hydrangea macrophylla Thunb. `Blaumeise Lace Cap') were transplanted into 10-cm azalea pots containing 1 peat: 1 vermiculite (by volume) into which CBA (sieved through 6-mm screen) had been mixed at 0%, 25%, or 50% on 18 Aug. 1996. They were then grown until bud maturation on 21Nov., precooled, and brought into the greenhouse for forcing on 9 Jan. 1997. The substrate pH levels were adjusted to 6.0–6.5 for pink flowers with dolomitic lime and with Al2(SO4)3 to a pH range of 5.0–5.5. Measurements were performed at anthesis on 19 Apr. There were no significant differences in fresh and dry weight and root quality index from 0% through 75% CBA media, but these parameters were reduced in 100% CBA for both blue- and pink-flowered plants. Plant heights and diameters were equal in 0% through 75% CBA and ranged from 16.33 to 17.56 cm and 17.33 to 18.06 cm, respectively, but were significantly reduced in 100% CBA for blue-flowered plants. Plant heights and diameters were equal in 0% through 100% CBA for pink-flowered plants and ranged from 21.0 to 24.0 and 19.3 to 23.5 cm, respectively. Diameters of blue inflorescences ranged from 95.9 to 104.9 cm, and these were equal on plants in 0% through 100% CBA. However, diameters of pink inflorescences ranged from 114.2–155.6 cm and were significantly reduced on plants in 25%, 50%, and 100% CBA.

The Malachite Green Biodegradation in Bioreactors on Various pH Domains

2019 ◽  
Vol 70 (8) ◽  
pp. 2996-2999
Author(s):  
Viorel Gheorghe ◽  
Catalina Gabriela Gheorghe ◽  
Andreea Bondarev ◽  
Vasile Matei ◽  
Mihaela Bombos
Keyword(s):  
Malachite Green ◽  
Contact Time ◽  
Dominant Species ◽  
Wastewater Treatment Plants ◽  
Organic Substances ◽  
Biological Degradation ◽  
Growth Promoters ◽  
Ph Values ◽  
Biological Sludge ◽  
Ph Range

In the experimental study was studied the malachite green colorant biodegradation in biological sludge with biological activity. The biodegradability tests were carried out in laboratory bioreactors, on aqueous solutions of green malachite contacted with microorganisms in which the dominant species is Paramecium caudatum, in a pH range between 8 and 12, temperatures in the ranges 25-350C, using pH neutralizing substances and biomass growth promoters. The colorant initial concentrations and those obtained after biological degradation depending on the contact time, at certain pH values, were established through UV-Vis spectrometry. The studies have shown the measure of possible biological degradation of some organic substances with extended uses, with largely aromatic structure, resistance to biodegradation of microorganisms, commonly used in wastewater treatment plants.

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