Temperature management has emerged as an important tool for plant height control in greenhouse production systems. This is particularly important in vegetable transplant production where chemical controls for plant height are limited or not legal. Plant height is a function of the number of nodes and the length of each internode, and both are strongly influenced by greenhouse temperatures. Node number, or formation rate, is primarily a function of the average greenhouse temperature, increasing as the average temperature increases. Internode length is strongly influenced by the relationship between the day and night temperature, commonly referred to as DIF (day temperature - night temperature). As DIF increases, so does internode length in most plant species studied. Although the nature and magnitude of temperature effects vary with species, cultivar, and environmental conditions, these two basic responses can be used to modify transplant growth. Although data are limited, controlling transplant height with temperature does not appear to adversely influence plant establishment or subsequent yield.
Characterizing the regulation of development by temperature requires controlled exposure of replicate plants (whole or in part) to multiple temperature environments simultaneously. Experiments with seeds or other small plant segments can be
Abstract
A water bath providing accurate and reliable temperature control for many types of biological studies can be made with materials available to all laboratories. The low cost permits assembling multiple units for short-term experiments, yet the equipment is durable enough for continued or repeated use.
predictor of N release from individual CRFs and CRF grouped by release duration in tomato production in south Florida. Material and Methods Accelerated temperature-controlled incubation method. Fourteen CRFs from Florikan ESA L.L.C. (Sarasota, FL), Agrium
index were measured on three replicate samples of 10 fruit per orchard. Fruit were removed after 7 months of storage and transferred to a controlled temperature evaluation room at 20 °C. After 1 d, the flesh firmness of 10 fruit per replicate was
limit the transferability of the results resulting from regional, climatic, and site-specific variables. In fact, no controlled environment research could be found evaluating low-temperature N uptake, metabolism, and use of turfgrass or the response
Abbreviations: CEGR, controlled-environment growth room; HI, high irradiance levels; LAR; leaf area ratio; LI, low irradianee levels; MHI, medium-high irradiance levels; MLI, medium-low irradiance levels; MRGR, mean relative growth rate; NAR, net
storage temperature by 2 °C, from 5 to 7 °C, reduced the effectiveness of CA to control VB, in line with the effect on SER. Table 6. Incidence of vascular browning (VB) and diffuse flesh discoloration (DFD) in ripe ‘Hass’ avocado fruit after storage for 4
where 1-MCP application was performed. After 24 h, fruit was removed from the treatment chamber or tent and moved to the same cold room as controls. All fruit were held at 10 °C for 6 additional days, then the storage temperature was reduced to 2.8 °C
Abstract
A device is described which maintains a set temperature ± 0.8°C from 5 to 30° above ambient in an inexpensive controlled-temperature chamber. Present construction cost is about $65. Ten chambers have performed satisfactorily during the past 3 years in research projects on chilling injury, seed germination, seeding growth, tissue culture growth, fruit storage, tree storage, and winter dormancy.