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The effectiveness of spraying foliage with urea to provide nitrogen (N) to augment the seasonal internal cycling of N in young nectarine trees ( Prunus persica (L.) Batsch var. nectarina (Ait. f. Maxim.), cv. Stark Red Gold) was studied. One-year-old trees were grown with contrasting N supplies...
To determine effects of stem nitrogen concentration ((N)) on the seasonal course of respiration, rates of stem respiration of ten control and ten irrigated–fertilized (IL), 30-year-old Norway spruce trees ( Picea abies (L.) Karst.), growing in northern Sweden, were measured on seven occasions...
A coupled photosynthesis–stomatal conductance model was parameterized and tested with branches of black spruce ( Picea mariana (Mill.) B.S.P.) and jack pine ( Pinus banksiana Lamb.) trees growing in the Northern Study Area of the Boreal Ecosystem–Atmosphere Study (BOREAS) in Manitoba, Canada....
Unlike an ideal system, the return time to thermal balance ( t b ) between upstream and downstream thermistors, as measured by the (compensation) heat pulse velocity method, effectively depends on the heat input and the water content of the wood at zero and low sap flow. Even when these factors...
Three definitions of leaf area index (LAI) in the literature have no predictable relationship with each other. Factors were derived for converting total LAI to projected LAI of horizontal leaves and to projected LAI for inclined leaves of lodgepole pine ( Pinus contorta Dougl. var. latifolia...
The observation that, for unstressed plants, light use efficiency of a plant canopy, defined as the ratio of net primary productivity (NPP) to absorbed photosynthetically active radiation (APAR), is approximately constant with respect to changes in APAR, implies that NPP can be modeled using a...
Growth and nutrient dynamics of bare-root white spruce ( Picea glauca (Moench) Voss) seedlings were monitored for three years in a nursery and for one season after planting to assess effects of three nursery fertilization regimes. Nitrogen (totaling 0, 650, and 1300 kg N ha −1 for 3 years) was...
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