Rooted cuttings of `Supjibi' poinsettia were potted in peat vermiculite, mixed with coal bottom ash at 0%, 25%, 50%, 75%, or 100% by volume. Values of pH were higher in media containing coal bottom ash. In general, pH increased for the first 4 weeks, during which time 50–100 ppm (N) fertilizer was being applied, decreased temporarily when 200 ppm fertilizer began, and then increased and stabilized for the last 5 weeks. At first, pH tended to be higher with increase in ash, but when 200 ppm fertilizer was begun, pH became the same in all coal ash levels. Once fertilization was stopped, pH tended again to be higher in ash media. Levels of EC remained low in all media when 50–100 ppm of fertilizer was applied, but increased after 200 ppm fertilizer was begun, increasing to excessive levels 2 weeks later. With more watering, EC declined in the 0% ash, but remained high in 50% to 100% ash media. Leaf Ca content increased with increase in media ash but was below the normal range in all plants. With increase in media ash, water capacity decreased, but bulk density increased. Bract color development in plants in ash media appeared delayed.
Modifications to solubilized cell wall polyuronides of sweet persimmon (Diospyros kaki L. `Fuyu') were examined during development of chilling injury (CI) during storage and in response to heat treatments that alleviated CI. Storage at 0 °C caused the solubilization of a polyuronide fraction that possessed a higher average molecular mass than polyuronide solubilized during normal ripening. The viscosity of this fraction was 30-times that of normally ripened fruit. Fruit heat-treated before or following storage contained a soluble polyuronide fraction with a markedly lower average molecular mass and decreased viscosity than in chilling injured fruit. Heat treatment also impeded an increase in viscosity of the cell wall material if applied before storage. CI (gelling) was related to the release of polyuronide from the cell wall during storage and its lack of subsequent degradation. Heat treatments retarded polyuronide release but promoted degradation of solubilized polyuronides.
. (1997) measured clay swelling behavior in situ. Like in soil studies, the physical properties of growing media used in horticulture are usually characterized by the water retention curve obtained during a drying process according to standardized
compaction can damage soil physical properties and inhibit turfgrass root growth as well as visual quality ( Turgeon, 2005 ). A past study proved that warm-season turfgrass species have a greater tolerance to wear compared with cool-season ones ( Shearman and
the fine and coarse barks. - The volume (m 3 ) of the fine and coarse barks. After the bark replicate within each MC treatment was processed, the bark was placed in a plastic bag and sealed to prevent further moisture loss. Physical properties
The most common substrate used in horticulture for growing seedlings and soilless plants cultivation is peat, alone or in mixture ( Chavez et al., 2008 ), because of its good chemical and physical properties. Unfortunately, peat is a very expensive
. Relative to plant requirements, a suitable combination of physical and chemical properties of the potting mix is needed to ensure satisfactory plant performance ( Clark and Zheng, 2015 ; Raviv et al., 2004 ). Species-specific growing substrates are
to determine basic physical properties [total porosity (TP), AS, and CC] of a substrate for a specific size and shaped container ( Bilderback and Fonteno, 1987 ; Milks et al., 1989b ). Container size has been proven to significantly alter substrate
from differences in the physical and chemical properties of the cell walls of ‘Regina’ skin, compared with those of ‘Burlat’. ‘Regina’ and ‘Burlat’ differ in mechanical properties of their fruit skins. The higher cracking susceptibility of ‘Burlat’ than
to improve the physical properties of compacted soils. In compacted soils, tillage breaks up massive structure, thereby increasing soil pore space and allowing water to infiltrate and roots to penetrate through the soil profile ( Lipiec and