The following three models were combined to predict simultaneously photosynthesis, stomatal conductance, transpiration and leaf temperature of a rose leaf: the biochemical model photosynthesis Farquhar, von Caemmerer Berry (1980, Planta149: 78–90), conductance Ball, Woodrow (In: Biggens J, ed. Progress in research. Netherlands: Martinus Nijhoff Publishers), an energy balance model. photosynthetic parameters: maximum carboxylation rate, potential rate electron transport triose phosphate...

Pierce's disease (PD) of Vitis vinifera grapevines is caused by the bacterium Xylella fastidiosa, a pathogen with wide plant host range. Exposure X. fastidiosa-infected tissue to cold temperatures has been shown be effective at eliminating from some hosts such as grapevines. This “cold curing” phenomenon suggests itself potential method for management and perhaps control. We investigated therapy PD-affected ‘Pinot Noir’ ‘Cabernet Sauvignon’ grapevine. In fall, inoculated plants controls each...

It is customary that growers apply high doses of nutrients to the soil in order achieve yields, with detrimental consequences for environment; but no information exists regards crop response fertilization levels.To evaluate physiological lettuce (Lactuca sativa L.) various root zone nutrient concentrations (expressed as electrical conductivity, from 0.6 10 dS m -1 ), a replicated experiment was conducted using increasing macronutrients applied an aeroponic system.Leaf photosynthesis and...

A mathematical description for the relationship between rate of rose (Rosa hybrida L.) leaf net photosynthesis and photosynthetically active radiation, temperature, age is developed. The model provides a tool prediction these rates leaves growing in crop canopy.

A computer-controlled drip irrigation system was used to implement three types of moisture regimes in the potting medium container-grown chrysanthemum [Dendranthema × grandiflorum (Ramat.) Kitamura] plants: “constant” tension treatments were maintained by setting low- and high-tension set-points same value; “variable” imposed 2 7 kPa, respectively, “timed” consisted irrigating once per day for a fixed (excessive) duration that resulted fluctuations ranging from O 10 kPa. Constant conditions...

Abstract Chrysanthemum × morifolium Ramat. cv. Polaris plants were grown in containers using an irrigation system based either on time (5 min/day) or soil moisture tensions of −1.5, −3.5, −7.5, and −15 kPa. Soil −7.5 kPa caused significant reductions over the time-based treatment fresh dry weights leaves, stems, inflorescences total leaf area, but had no influence inflorescence diameter cropping time. Stem length was reduced those exposed to two higher tensions; however, resulting cut...

The response of ‘Kardinal’ rose plants to temperature was measured develop a model for predicting flower size range greenhouse conditions. number days from bud break (BB) flowering increased 21.6 63.0 as decreased 30 15°C. primarily influenced by the after visible (VB). This suggests that before VB may not significantly affect rate development. Leaf area, stem length and diameter generally with decreasing temperature, but best quality stems observed at 18°C. Flower dry weight, however, 0.7...

To explore the possibility that saline wastewaters may be used to grow commercially acceptable floriculture crops, a study was initiated determine effects of salinity on two statice cultivars. Limonium perezii (Stapf) F. T. Hubb. `Blue Seas' and L. sinuatum (L.) Mill `American Beauty' were grown in greenhouse sand cultures irrigated with waters prepared simulate drainage typically present western San Joaquin Valley (SJV) California. Seven treatments imposed 3-week-old seedlings. Electrical...

Physical characteristics of two media were studied concerning water availability to roots, as reflected in specific transpiration rate, stomatal conductance, and growth rate very young leaflets `Kardinal' rose ( Rosa × hybrida L.), grafted on canina L. `Natal Brier'. Plants grown UC mix [42% composted fir bark, 33% peat, 25% sand (by volume)] or coconut coir. Water release curves the developed hydraulic conductivities calculated. Irrigation pulses actuated according predetermined moisture...

Nitrate content in leafy green vegetables has raised concerns among consumers and policy makers worldwide.Several cultural practices have been evaluated to manipulate NO3 -content fresh leaves with varying degrees of success.The present study was conducted evaluate different concentrations the nutrient solution applied during day (D) night (N) aeroponically grown lettuce (Lactuca sativa L.) Davis, California, USA, spring 2012 objective assessing effect on growth, leaf photosynthesis, nitrate...