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Sustainable High Yields on Poorly Drained Soils. For presentation: Water for Food Conference Lincoln, Nebraska May 1-3, 2011 R. Wayne Skaggs. Drainage in United States (Million Ha) Total Cropland 170 Cropland Requiring Drainage 43 (25%).

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sustainable high yields on poorly drained soils

Sustainable High Yields on Poorly Drained Soils

For presentation:

Water for Food Conference

Lincoln, Nebraska

May 1-3, 2011

R. Wayne Skaggs

slide2

Drainage in United States (Million Ha)

Total Cropland 170

Cropland Requiring Drainage 43 (25%)

drainage world wide smedema et al 2004
DRAINAGE WORLD-WIDE(Smedema et al. 2004)

Cropland NeedingDrainage 500 Million Ha

(33% of Total Cropland)

cropland needing drainage smedema et al 2004
CROPLAND NEEDING DRAINAGE(Smedema et al. 2004)

Million Ha

All Cropland 500 (33%)

Irrigated Cropland 150 (55%)

Rainfed Cropland 350 (28%)

slide11

Avg. annual nitrogen yieldMississippi River

of streams for 1980-1996 Drainage Basin

Hypoxic Zone

slide15

45

40

35

30

25

20

15

10

5

0

Natural

Moderate

Intensive

Slow Dr.

TOTAL NITROGEN

42.1

20.0

13.6

3.6

Total Nitrogen (kg/ha/yr)

potential effect of dwm in the midwest on n load to gulf of mexico
Potential Effect of DWM in the Midwest on N Load to Gulf of Mexico
  • 50,000 ton N per Year
  • Based on 8.3 million Ac of drained corn and soybean land in the states of Iowa, Indiana, Illinois, Ohio and Minnesota (Jaynes et al., 2008)
  • NRCS recently (March, 2011) announced a major initiative to promote DWM and related practices in the upper Midwest to reduce N losses to the Mississippi River and Gulf of Mexico.
slide22

Agrosphere

Modeling

for

Producing

Large

Increases

in

Food

Yield

A

M

P

L

I

F

Y

  • AMPLIFY is a initiative enabling public and private sector scientists to partner with producers to achieve high yield in an environmentally and economically sustainable manner.
hypothesis
Hypothesis

Drought stresses can be substantially reduced and yields increased by increasing root depths in poorly drained soils in humid regions

methods to increase root depth
Methods to Increase Root Depth
  • Increase pH to > 5.5 to depths of > 60 cm
  • Incorporate Organic Matter
  • Genetic Manipulation
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