Elevated CO enhances below-ground C allocation in three perennial grass species at different levels of N availability.

Three perennial grass species, Lolium perenne L., Agrottis capillaris L. and Festuca uvina L.

Effects of ambient ozone on injury and yield of Phaseolus vulgaris at four rural sites in the Netherlands as assessed by using ethylenediurea (EDU).

To assess adverse effects of ambient ozone on injury and yield, EDU (ethylenediurea) and non-EDU-treated plants of bean (Phaseolus vulgaris L. cv. Lit) were exposed to ambient air at four rural sites in the Netherlands in 1994.

Sink strength as a determinant of dry matter partitioning in the whole plant.

Dry matter partitioning is the end result of the flow of assimilates from source organs via a transport path to the sink organs. The dry matter partitioning among the sinks of a plant is primarily regulated by the sinks themselves. The effect of source strength on dry matter partitioning is often not a direct one, but indirect via the formation of sink organs.

Effects of Ascochyta caulina on photosynthesis of leaves of Chenopodium album.

The effect of leaf necrosis caused by Ascochyta caulina (P. Karst.) v.

Differences between super-centrifuged and membrane-filtrated soil solutions obtained from bulked and non-bulked topsoils by soil centrifugation.

The composition of the soil solution must be known to estimate the mobility and availability of plant nutrients and contaminants. When soil centrifugation is used to obtain the soil water for analysis, bulked soil samples are normally used in order to reduce random variations. In the present study, large systematic differences between the centrifugates from bulked and core samples are reported.

Nitrogen fertilization and sex expression affect size variability of fibre hemp (Cannabis sativa L.).

Mechanical harvesting and industrial processing of fibre hemp (Cannabis sativa L.) require uniformity of stem length and weight. In 1991 and 1992 we carried out field experiments to investigate the effects of soil nitrogen level (80 and 200 kg haN) and row width (12.

Carbon allocation and water use in juvenile Douglas fir under elevated CO.

In this study the impact of an elevated CO level on allocation of assimilates and water use efficiency of Douglas fir [Pseudotsuga menziesii (Mirb.) Franco] was investigated. Juvenile Douglas firs were exposed to a long-term treatment at 350 and 700 μ 1 CO for 14 months and subsequently crosswise transferred to phytotrons for a short-term treatment with 350 and 700 μ l CO for 4 wk in an atmosphere continuously labelled with CO .

Effects of short-term ozone exposure on the carbon economy of mature and juvenile Douglas firs [Pseudotsuga menziesii (Mirb.) Franco].

Effects of short-term ozone exposure of mature trees were compared with those of seedlings. Both 25-yr-old Douglas firs [Pseudotsuga menziesii (Mirb.) Franco] and 3-yr-old Douglas fir seedlings were exposed to 0, 200 and 400 μgm ozone for about 1.

A simulation model for dry matter partitioning in cucumber.

A dynamic model is developed for the simulation of the daily dry matter distribution between the generative and vegetative plant parts and the distribution among individual fruits in greenhouse cucumber. The model is based on the hypothesis that dry matter partitioning is regulated by the sink strengths of the plant organs. The sink strength of an organ is denned here as its potential growth rate, i.

Effects of short-term ozone exposure and soil water availability on the carbon economy of juvenile Douglas-fir.

Effects of ozone and soil water availability on partitioning and translocation of assimilates were studied in three-year-old Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) seedlings exposed, in separate experiments, to 0 and 106 or 0 and 514 micro g m(-3) ozone for 8 h day(-1) for 9 days. The dynamics of carbon from assimilated (14)CO(2) were followed.