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Last modified
1/26/2010 2:23:38 PM
Creation date
10/12/2006 1:46:05 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8149.900
Description
Miscellaneous Small Projects and Project Studies - Holly BMP's
State
CO
Basin
Arkansas
Water Division
2
Date
1/1/3000
Author
Gary Banuelos Paul R
Title
Evaluating The Ability of Three Forage Species to Tolerate High Saline Conditions in Colorado
Water Supply Pro - Doc Type
Report/Study
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<br />000034 <br /> <br />3 <br /> <br />for each plant species by periodic weighing of pots_ Water treatment was applied in a partially <br />subsurface perforated containers to avoid direct contact between foliage and irrigation water <br />(plants can absorb salts through the leaves). Leaching was kept to a minimum. Plants were <br />planted by seed 2 cm below soil surfaces, grown in a temperature-controlled greenhouse using a <br />24:1:2' C day/night temperature regime with an average photon flux density of 400 ,umol m's'l. <br /> <br />Tall fescue was initially clipped 60 days after planting and then clipped in 20-30 day intervals. <br />Final harvest was 35 days after previous clipping. Both types of birds foot trefoil were initially <br />clipped 120 days after planting and then clipped in 30-35 intervals_ Clipping "four" for birdsfoot <br />trefoil was conducted" 50 days after previous clipping_ Clipping interval regimes were <br />subjectively determined based on visual regrowth, on or about in 30 day intervals, when possible <br />for all species. Generally, clipping was perfonned to an approximate height of 10 cm above soil <br />surface. Plant material was processed at a future date_ Approximately 317 days after planting, all <br />plant species were completely harvested 2 cm above the soil surface. Harvested and clipped plant <br />material was oven-dried at 50'C, dry matter (DM) yield recorded, and then ground in a Wiley <br />mill. Plant sub-samples were taken and then wet-acid digested and analyzed for Ca2+, Mg'+, and <br />Na+ by the inductively coupled plasma spectometry_ Additional plant sub-samples were extracted <br />with 2% acetic acid and tissue cr concentrations were determined potentiometrically. Composite <br />soil samples were made from all replications within each treatment for each species and soil EC <br />(electrical conductivity in dS m-I), pH, and soluble Ca2+, Mg2+, Na+, and Cl' concentrations were <br />determined at preplant and postharvest from a saturated soil paste_ <br /> <br />Results <br /> <br />General obsen'ations <br />Tall fescue thrived and outperformed both varieties of birds foot trefoil under the test conditions, <br />irrespective of treatment Narrow~leafbirdsfoot trefoil appeared to grow and look better than the <br />broad-leaf trefoil under poor growing conditions (i.e., bad soil, poor irrigation water)_ Salt <br />toxicity symptoms (burning of the leaf margins) and stunting of growth began to appear in all <br />three species shortly after applying "poor If' quality water. <br /> <br />Biomass <br />Tall fescue was clipped ten times throughout the designated growing season, while narrow-and <br />broad-leafbirdsfoot trefoil were clipped six times_ Generally, height of all plant species were <br />highest for the following at each clipping' treatments 1>4>2 (data not shown)_ Individual DM for <br />each clipping and total DM are presented in Table 3 and 4 for all species; a histogram overview of <br />DM production is shown in Figure 1, 2 and 3 for all plant species (final clipping or harvest was <br />higher in on Figures 1, 2 and 3 because each plant species was clipped to within 2 cm of the soil <br />surface). Tall fescue produced more DM than both varieties of birds foot trefoil at any treatment <br />and did not experience significant decreases in DM among the treatments_ Narrow-leafbirdsfoot <br />produced more biomass than broad-Ieafbirdsfoot at any treatment Moreover, the DM yield <br />appears to be stimulated in narrow-leaf by either "poor" quality water or "poor" quality soil. <br />
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