Lawns, Lakes - PowerPoint PPT Presentation

1 / 18
About This Presentation
Title:

Lawns, Lakes

Description:

Most limiting plant nutrient in waterbodies. Algae 'blooms' = low oxygen and smell ... Investigate the introduction of grass carp to control algal growth ... – PowerPoint PPT presentation

Number of Views:47
Avg rating:3.0/5.0
Slides: 19
Provided by: rons157
Category:
Tags: carp | lakes | lawns

less

Transcript and Presenter's Notes

Title: Lawns, Lakes


1
Lawns, Storm Water, and You
2
Over-enrichment of waterbodies
3
Phosphorusand plants
  • Function Energy transfer and cell division
  • Deficiency Stunted growth
  • Deficiency Purple or yellow leaves
  • Deficiency More common in cool spring

RARE!
4
Impacts of phosphorus
High growth
Low light
Low oxygen
  • Most limiting plant nutrient in waterbodies
  • Algae blooms low oxygen and smell
  • 1 lbs P 300 lbs to 500 lbs algae

5
A factor of 1,000 less!
60 parts per BILLION
30 parts per MILLION
It takes a 1,000 times less phosphorus to turn a
waterbody green than keep a lawn healthy
6
Experimental Lake Area Study(Fisheries and
Oceans Canada)
  • Top-to-bottom curtain divides lake in two
  • Carbon and nitrogen added to one side
  • Carbon, nitrogen and phosphorus added to
    other effect is clear to see

7
Every city lot is waterfront property!
8
(No Transcript)
9
Sources of phosphorus runoff
10
Controlling P runoff is a package deal
11
Reading the bag
Look for the middle number!N - P - K
  • Rarely needed on established lawns
  • Important when seeding or sodding
  • Apply according to soil test

12
Reading the bag
Look for the zero in middle for phosphorus-free
13
What to advise . . .
  • On existing lawns
  • - Use 0 or low P2O5 fertilizer unless a
    need for phosphorus is shown (soil test)
  • - Soil test if lawn is failing to thrive
  • - Apply per soil test recommendations when
    phosphorus is used

14
What to advise . . .
  • All lawns
  • - Sweep up, rake up, pick up
  • - Soil test if interested in baseline

15
How to reduce nutrients
  • Future? practices to increase infiltration
  • Buffer strips around water bodies help to
    reduce nutrient loading

Rain garden in Burnsville, MN
16
Things the City will do to mitigate effects of
phosphorus
  • Investigate Use of algaecide to control algal
    blooms
  • Investigate use of plants and floating islands to
    control available phosphorus
  • Investigate the introduction of grass carp to
    control algal growth

17
Things residents can do to control phosphorus
impact
  • Apply Low or No Phosphorus fertilizer to lawns
  • Maintain filter/buffer strips to help lessen
    phosphorus loads on basins
  • Maintain grass height at least 3 tall which
    promotes better grass health and lessens runoff
  • Bag leaves and grass or insure they are not
    deposited into basins

18
Contact Information
David Scanlan, Storm Water Utility, 323 -
8172 Jesse Leckband, Storm Water Utility, 323 -
8173
19
Information used
A Primer on Limnology. Bruce Monson. University
of Minnesota Water Resources Center. The Nature
of Phosphorus in Soils. Lowell Busman, et.al.
University of Minnesota Extension Service. Pub.
FO-6795 Phosphorus Transport and Availability in
Surface Waters. Gyles Randall, et.al. U of MN
Extension Service. Pub. FO-6796 Soil Test
Interpretation and Fertilizer Management for
Lawns, Turf, Gardens, and Landscape Plants. Carl
Rosen, et.al. University of Minnesota Extension
Service. Pub. BU-1731 Understanding Lake Data.
Byron Shaw, et.al. University of Wisconsin
Extension. Pub. G3582
Write a Comment
User Comments (0)
About PowerShow.com