Leaves of Grass: nutrient requirements for every turfgrass
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Leaves of Grass: nutrient requirements for every turfgrass Micah Woods, Ph.D. Chief Scientist | Asian Turfgrass Center www.asianturfgrass.com @asianturfgrass 15 August 2014 South China Turf Managers Association Sheraton Cotai Central, Macau http://www.seminar.asianturfgrass.com/20140815_leaves_of_grass.html
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High quality turf must be supplied with enough of each essential nutrient. The nutrients the grass uses will either come from the soil or must be supplied as fertilizer. How can a turf manager be sure that all nutrients are supplied to the turf in adequate amounts? This presentation will explain how the maximum amount of each element used by the grass can be estimated, and how the minimum levels for sustainable nutrition (MLSN) guidelines can be used to ensure that the grass is always supplied with enough of each element.
Transcript of Leaves of Grass: nutrient requirements for every turfgrass
Leaves of Grass: nutrient requirements for every turfgrass
Micah Woods, Ph.D.Chief Scientist | Asian Turfgrass Centerwww.asianturfgrass.com@asianturfgrass
15 August 2014South China Turf Managers AssociationSheraton Cotai Central, Macauhttp://www.seminar.asianturfgrass.com/20140815_leaves_of_grass.html
Penn G-2 creeping bentgrass Shanghai, ChinaWhat are we trying to do?
1. Ensure all essential elements are in adequate supply
perennial ryegrassChiba, Japan
2. Maximize nutrient use efficiency by applying the
minimum amount required
Penncross creeping bentgrassChiba, Japan
How do we accomplish 1) adequate supply &
2) maximum efficiency? Penn A-1 bentgrass, USA
Enough K No K
We need to know 3 quantities
L-93 creeping bentgrassIthaca, New York
1. How much of an element is
present in the soil?
2. How much of an element is
needed in the soil?
3. How much of an element does the grass use?
Quantity 1 (amount present)obtained from soil test
Cornell University Nutrient Analysis Laboratory, New York
ReferenceNovember, 2012
Minimum Levels for Sustainable Nutrition
Soil Guidelines
Minimum Level for Sustainable Nutrition (MLSN) is a new, more sustainable approach to managing soil nutrient levels that can help you to decrease fertilizer inputs and costs, while still maintaining desired turf quality and playability levels. The MLSN guidelines were developed in a joint project between PACE Turf and the Asian Turfgrass Center. All soil analyses were conducted at Brookside Laboratories, New Knoxville, OH.
MLSN Soil Guideline
pH >5.5
Potassium (K ppm) 35
Phosphorus (P ppm); pH<7.5, Mehlich 3 18
Phosphorus (P ppm); pH<7.5, Bray 2 25
Phosphorus (P ppm); pH>7.5, Olsen 6
Calcium (Ca ppm) 360
Magnesium (Mg ppm) 54
Managing sodium and salts: In locations where poor quality irrigation
meet the guideline of <110 ppm sodium or <2 dS/m salts, MLSN guidelines and overall management practices may need to be
basis. For more informa
Quantity 2 (amount needed) obtained from MLSN guidelines
http://www.seminar.asianturfgrass.com/20140815_leaves_of_grass.html
Quantity 3 (amount used) estimated based on applied nitrogen
Fukuoka, Japan
The amount of fertilizer ( F ) to apply is:
F = MLSN (g/m2) + Harvest (g/m2) - soil test (g/m2)
60
0 0
600
20
40
60
Soil Test AnnualPlant Uptake
FertilizerApplied
Remainingin Soil
K (p
pm)
60
−47.9 0
12.10
20
40
60
Soil Test AnnualPlant Uptake
FertilizerApplied
Remainingin Soil
K (p
pm)
60
−47.9 33.5
45.60
20
40
60
Soil Test AnnualPlant Uptake
FertilizerApplied
Remainingin Soil
K (p
pm)
8.96
−7.15 5
6.810.0
2.5
5.0
7.5
Soil Test AnnualPlant Uptake
FertilizerApplied
Remainingin Soil
K (g
m2 )
74.6
−1.6 0
730
20
40
60
Soil Test AnnualPlant Uptake
FertilizerApplied
Remainingin Soil
Ca (g
m2 )
The amount of fertilizer ( F ) to apply is:
F = MLSN (g/m2) + Harvest (g/m2) - soil test (g/m2)
“N supply was the primary determinant of turfgrass growth rate, plant nutrient demand, and nutrient uptake. Nitrogen uptake accounted for over 88% of uptake of all other nutrients. Uptake of P and K were strongly related to tissue N content irrespective of soil test levels.”
Kussow et al., 2012
ISRN Agronomy. Evidence, Regulation, and Consequences of Nitrogen-driven Nutrient Demand by Turfgrass.
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