Effects of artificial amendments in potting media on Orthosiphon aristatus growth and development

Nguyen, Trung-Ta; Joyce, Daryl C.; Dinh, Quang Minh

doi:10.1016/j.scienta.2009.07.023

Cited by 10 publications

(13 citation statements)

References 34 publications

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“…PAG amendment (0.4%, w/w) also enhanced drought tolerance of citrus plants and prolonged seedling survival under water stress conditions [61]. On the contrary, Nguyen et al [57] observed inability of PAM and UFRF amendments for delaying PWP of Orthosiphon aristatus.…”

Section: Effect On Pwp and Moisture Contentmentioning

confidence: 96%

“…Alginate amendment also showed comparable results with psyllium and bacterial polymer. Conversely, urea-formaldehyde resin foam (UFRF) and PAG amendment neither shown increase in shoot fresh mass nor in dry weight of Orthosiphon aristatusin [57]. Nikolopoulou et al [58] also observed that turfgrass root dry mass could even reduce upon UFRF amendment.…”

Section: Effect On Germination and Seedling Growthmentioning

confidence: 99%

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Studies on Amendment of Different Biopolymers in Sandy Loam and Their Effect on Germination, Seedling Growth of Gossypium herbaceum L.

Patil

Salunke

Salunkhe

2010

Appl Biochem Biotechnol

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Different biopolymers, agar, cellulose, alginate, psyllium gaur gum, and bacterial exopolysaccharide (EPS) powders were amended to check their efficacy in enhancing maximum water holding capacity (MWHC), permanent wilting point (PWP), and germination and seedling growth of the Gossypium herbaceum in a laboratory scale. The efficacy of all biopolymers for enhancement of MWHC, PWP, and growth was also analyzed by measuring organic carbon, organic matter, total nitrogen, respiration rate, and microflora in amended and control sandy loams. The range of concentrations (0.2-2%) of all biopolymers was incorporated in sandy loam containing pots. The soil without polymer was considered as control. The psyllium (0.6%) and bacterial EPS (1%) amended soil has 242 and 233% increase in MWHC and thus delaying in the permanent wilting point by 108 and 84 h at 37 °C, respectively, as compared to control. All biopolymers found to increase more or less MWHC, organic matter, total nitrogen, microflora, and PWP as compared to control. The psyllium and bacterial EPS show the highest increase organic matter, biomass, and microflora. The highest reduction in MWHC after 12 weeks were observed in cellulose, gaur gum, and alginate; besides, psyllium, bacterial EPS, and agar showed comparatively less reduction MWHC, i.e., 24% and 14.5%, respectively. The toxicity studies of biopolymer were carried out on earthworm (Eisenia foetida). It revealed their nontoxic nature. The biopolymer amendment in sandy loam can be an effective strategy to improved soil texture, fertility, and thereby crop yield.

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Section: Effect On Pwp and Moisture Contentmentioning

confidence: 96%

Section: Effect On Germination and Seedling Growthmentioning

confidence: 99%

Studies on Amendment of Different Biopolymers in Sandy Loam and Their Effect on Germination, Seedling Growth of Gossypium herbaceum L.

Patil

Salunke

Salunkhe

2010

Appl Biochem Biotechnol

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“…The roof-tile substrate had the lowest WHC (44%), rather than the scoria substrate (45.9%), and we found that differences in Cumulative ET between the three substrates were better related to their plant available water (PAW). Whilst WHC is often used to describe the maximum amount of stored water and the maximum substrate weight [10,14], it does not necessarily represent water that can be extracted from the media, i.e., PAW [44]. Fassman and Simcock [14] and Stovin et al [26] also found water retention of green roof substrates was better related to PAW than WHC.…”

Section: Effect Of Substrate Physical Properties and Vegetation Covermentioning

confidence: 99%

Laboratory Tests of Substrate Physical Properties May Not Represent the Retention Capacity of Green Roof Substrates In Situ

Szota

Fletcher

Desbois

et al. 2017

Water

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Green roofs can be used to reduce the volume of polluted stormwater that is generated by cities. Modelling rainfall retention is critical, but green roof water balance models often rely on the physical properties of substrates. In these models, substrate water holding capacity (WHC) determines the depth of water which can be stored before runoff is generated; whereas, the permanent wilting point (PWP) limits evapotranspiration. The WHC and PWP, as well as plant available water (PAW; where PAW = WHC − PWP), as determined from laboratory tests, may not truly reflect how substrates perform on green roofs. We therefore ran a simulated rainfall experiment on green roof modules to (i) compare the rainfall retention of vegetated and non-vegetated substrates with different WHC and PAW, and (ii) relate retention to substrate storage capacity, as calculated from laboratory measures of WHC and PAW. We found that the PAW of a substrate is a better indicator of evapotranspiration and retention when compared with WHC. However, we also found that substrates always retained less water than their calculated storage capacity would suggest, most likely being due to their high permeability. Our results indicate that using laboratory-derived measures of WHC and PAW in green roof models may be over-estimating both evapotranspiration and rainfall retention.

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“…This hydrophilic polymer attracted great deal of research attention due to its intriguing properties and applications especially when the product is applied in planting media (Nie et al, 2004 andPeng et al, 2008). This water-absorbing polymer or soil amendment may enhance plant survival through its ability to imbibe large amounts of water and exhibit high permeability to oxygen, nutrients, and water soluble metabolites, particularly in sandy soils (Al-Humaid, 2005, Al-Humaid and Moftah, 2007, Thomas, 2008Nguyen et al, 2009, Beniwal et al, 2010, Beniwal et al, 2011and Guyomard-Lack et al, 2012. In other words, hydrogel functions as an additional water reservoir for the soil-plantair system (Luo et al, 2009).…”

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confidence: 99%

Improving some Physical Properties of Sandy Soil and Conocarpus erectus L. Plant Growth by the Application of Hydrogel

2013

Egypt.J. Soil Sci.

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OIL physical properties of a growing medium are important ……. for optimal plant growth. The present factorial pot experiment was carried out at the Faculty of Agriculture, Cairo University, Giza, Egypt, during two successive seasons of 2010 and 2011. The study aimed at investigating the effects of synthetic commercial amendment (hydrogel) levels applied under two irrigation rates, to assess their influence on some sandy soil physical properties and buttonwood (Conocarpus erectus L.) seedlings growth traits. The irrigation rates were 65 and 35% of the available soil moisture depletion (ASMD), whereas the hydrogel levels were 0.00 (control), 0.05, 0.10 and 0.20%. Soil physical properties were evaluated by determining the total porosity, field capacity, wilting point, available water, and soil bulk density. Moreover, the plant height, root length, shoots and roots fresh and dry weights and shoots: roots ratio, as expressions of seedlings growth responses, were also measured. Generally, the sandy soil physical properties as well as the seedlings shoot and root growths were improved by increasing hydrogel concentration in the soil when compared to their controls. The two irrigation rates also affected both of the soil properties and the seedlings growth. Furthermore, the highest concentration of the hydrogel amendment under 35% ASMD prolonged the soil water loss time; increased the field capacity, which reflected on the soil available water; encouraged formation of aggregates that, in turn, decreased the soil bulk densities; and hence improved the seedling shoots and roots growth biometrics. This study demonstrates also that the addition of hydrogel to planting medium under different irrigation rates increases water use efficiency by preventing applied moisture from infiltrating beyond plant root zones and maximizing the portion of applied water available for plant uptake. Thereby amended sandy soil with hydrophilic-gel can be used in arid and semi-arid areas to provide a better environment for seedlings to grow.

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Effects of artificial amendments in potting media on Orthosiphon aristatus growth and development

Cited by 10 publications

References 34 publications

Studies on Amendment of Different Biopolymers in Sandy Loam and Their Effect on Germination, Seedling Growth of Gossypium herbaceum L.

Studies on Amendment of Different Biopolymers in Sandy Loam and Their Effect on Germination, Seedling Growth of Gossypium herbaceum L.

Laboratory Tests of Substrate Physical Properties May Not Represent the Retention Capacity of Green Roof Substrates In Situ

Improving some Physical Properties of Sandy Soil and Conocarpus erectus L. Plant Growth by the Application of Hydrogel

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