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Tillage Effects on Seed Distribution and Common Milkweed (Asclepias syriaca) Establishment

Published online by Cambridge University Press:  12 June 2017

Joseph P. Yenish ,
Thomas A. Fry ,
Beverly R. Durgan  and
Donald L. Wyse
Joseph P. Yenish
Affiliation:
Dep. Agron. and Plant Genet., Univ. of Minnesota, St. Paul, MN 55108
Thomas A. Fry
Affiliation:
Dep. Agron. and Plant Genet., Univ. of Minnesota, St. Paul, MN 55108
Beverly R. Durgan
Affiliation:
Dep. Agron. and Plant Genet., Univ. of Minnesota, St. Paul, MN 55108
Donald L. Wyse
Affiliation:
Dep. Agron. and Plant Genet., Univ. of Minnesota, St. Paul, MN 55108
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Abstract

Soil profile distribution of a single simulated seed dispersal event after tillage followed a nonlinear model. Approximately 40% of recovered simulated seed were found within 4 cm of the surface following chisel plowing and disking, and density declined steadily with depth to 20 cm. Moldboard plowing placed 50 to 60% of simulated seed to a depth of 11 to 16 cm. Simulated seed were evenly distributed to 8 cm depth by disking and did not differ regardless of whether plots were chisel or moldboard plowed prior to seed dispersal. More than 90% of seed remained within 2 cm of the surface with no-tillage. Simulated seed distribution was the same after a tillage rotation of chisel plowing, disking, moldboard plowing, and disking regardless if the dispersal event occurred prior to chisel or moldboard plowing. Two years of the tillage rotation and two dispersal events resulted in a distribution pattern greatly influenced by the most recent major tillage of chisel or moldboard plowing. Seedling emergence of common milkweed averaged 80% for seed buried 0.5 to 4 cm deep and emergence was negligible for seed on the surface or buried 7 cm in soil in pots in a growth chamber.

Keywords

Common milkweed, Asclepias syriaca L. ♯ ASCSYConservation tillageseedling emergenceperennial weeds
Type
Weed Biology and Ecology
Information
Weed Science , Volume 44 , Issue 4 , December 1996 , pp. 815 - 820
Copyright
Copyright © 1996 by the Weed Science Society of America 

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