A preliminary evaluation of the environmental toxicology of road salts on plant root dynamics

BIOS ◽  
2021 ◽  
Vol 92 (2) ◽  
Author(s):  
Keerti Kurapati ◽  
Jackson Stachelek ◽  
Taylor Gauthier ◽  
Hannah Thomas ◽  
Víctor D. Carmona-Galindo
Keyword(s):  
Plant Root ◽  
Environmental Toxicology ◽  
Preliminary Evaluation ◽  
Root Dynamics ◽  
Road Salts

scholarly journals The development of an optical scanner method for observation of plant root dynamics

Plant Root ◽  
2008 ◽  
Vol 2 ◽  
pp. 14-18 ◽  
Author(s):  
Masako Dannoura ◽  
Yuji Kominami ◽  
Hiroyuki Oguma ◽  
Yoichi Kanazawa
Keyword(s):  
Plant Root ◽  
Root Dynamics ◽  
Optical Scanner

scholarly journals 268 Nursery Irrigation Effects on Postplanting Root Dynamics of Limonium cossonianum O. Kuntze in Semi-arid Conditions

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 488D-488
Author(s):  
J.A. Franco ◽  
M.J. GarcÌa ◽  
V. Cros
Keyword(s):  
Root Growth ◽  
Root Length Density ◽  
Plant Root ◽  
Mediterranean Coast ◽  
Silica Sand ◽  
Root Dynamics ◽  
Deep Soil ◽  
Irrigation Treatments ◽  
Irrigation Effects ◽  
Water Holding

A study was conducted with Limonium cossonianum O. Kuntze to analyze the influence of irrigation regime in nursery on the dynamics of root development after being transplanted with minimum management conditions. Plants were potgrown in a greenhouse. Each plant was potted into 625-mL plastic pot filled with a 1 silica sand medium: 1 peat mixture (v/v) amended with osmocote plus (3.7 g•kg-1 substrate). Drip irrigation was used with a 2-L•h-1 emitter per plant. Two irrigation treatments were used: T3, plants watered 6 days a week at the water-holding capacity (leaching 20% of the applied water) and T1, plants watered twice a week, receiving an amount of water at 30% of T3 plants troughout the nursery period (45 days). After nursery period, plants were transplanted in the open air at the southeast Mediterranean coast of Spain (37°47′N, 0°′54′W), and just one establishment irrigation was applied (50 mm). There were three replications. Plant root and top growth were measured weekly for 13 months. For the root dynamics study, minirhizotrons were used. Acrylic tubes, 2 m long and 80 mm in outside diameter, were placed at a inclination of 24°, reaching a total depth of 160 cm. The evolution of the root length density (RLD) was measured by seven 23-cm-deep soil layers. Results indicate that those plants that were less watered in nursery showed a greater RLD for the whole soil profile. Plants root growth for the top 46 cm of soil were not significantly affected by irrigation treatments; between 46 and 115 cm deep, T1 plants showed greater RLD than T3 (average values of 0.6 vs. 0.3 cm•cm-3); and under 115-cm deep (where root growth was more limited), there were not significant differences. For the first 6 months, a important plant top growth was observed, there being no significant differences among irrigation treatments. Research suported by CICYT grant AGF-96-1136-C02-02.

Preliminary Evaluation of a Weibull Function for Fitting Slow-Component Eye Velocity over the Time Course of Caloric-Induced Nystagmus

1989 ◽  
Vol 32 (3) ◽  
pp. 681-687 ◽  
Author(s):  
C. Formby ◽  
B. Albritton ◽  
I. M. Rivera
Keyword(s):  
Time Course ◽  
Slow Component ◽  
Weibull Function ◽  
Preliminary Evaluation ◽  
Mathematical Function ◽  
Before And After ◽  
Best Fitting ◽  
Eye Velocity ◽  
Fitting Parameters ◽  
Weibull Equation

We describe preliminary attempts to fit a mathematical function to the slow-component eye velocity (SCV) over the time course of caloric-induced nystagmus. Initially, we consider a Weibull equation with three parameters. These parameters are estimated by a least-squares procedure to fit digitized SCV data. We present examples of SCV data and fitted curves to show how adjustments in the parameters of the model affect the fitted curve. The best fitting parameters are presented for curves fit to 120 warm caloric responses. The fitting parameters and the efficacy of the fitted curves are compared before and after the SCV data were smoothed to reduce response variability. We also consider a more flexible four-parameter Weibull equation that, for 98% of the smoothed caloric responses, yields fits that describe the data more precisely than a line through the mean. Finally, we consider advantages and problems in fitting the Weibull function to caloric data.

Letters. Environmental toxicology

1983 ◽  
Vol 17 (4) ◽  
pp. 160-160
Author(s):  
Jerry Hook
Keyword(s):  
Environmental Toxicology
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