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Long-Term Effects of No-tillage in a Winter Wheat (Triticum aestivum)-Sorghum (Sorghum bicolor)-Fallow Rotation

Published online by Cambridge University Press:  12 June 2017

Gail A. Wicks ,
Darryl E. Smika  and
Gary W. Hergert
Gail A. Wicks
Affiliation:
Univ. Nebraska West Central Res. and Ext. Ctr., North Platte, NE 69101
Darryl E. Smika
Affiliation:
Soil, Water, and Air Sciences, USDA-ARS, Akron, CO 80720
Gary W. Hergert
Affiliation:
Univ. Nebraska West Central Res. and Ext. Ctr., North Platte, NE 69101
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Abstract

This research was conducted near North Platte, NE, over an 18-yr period to determine the feasibility of using herbicides to replace tillage as the weed control method in a winter wheat (Triticum aestivum L.)-sorghum [Sorghum bicolor (L.) Moench.]-fallow rotation. Five tillage treatments [two tillage and three reduced or no-till treatments] were used on the same plots during the duration of this experiment on a Holdrege silt loam (Typic Argiustolls). Herbicides effectively replaced tillage for weed control. The no-till plots treated with atrazine [6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamine] after wheat harvest had higher sorghum and winter wheat yields, higher crop residue remaining on the soil surface, and lower weed yields than tilled plots. The most difficult weeds to control were volunteer wheat and barnyardgrass [Echinochloa crus-galli (L.) Beauv. # ECHCG]. Soil surface pH decreased over time because of increased use of nitrogen. The pH in nontilled plots was significantly lower than in tilled plots due to lack of soil mixing. Exchangeable calcium was the predominant cation leached from the top 5 cm but showed accumulation between the 5- to 12.5-cm depth. Organic matter content showed little change over time.

Keywords

Ecofallowecofarmingweed managementTriticum aestivum LSorghum bicolor (L.) Moench
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 36 , Issue 3 , May 1988 , pp. 384 - 393
Copyright
Copyright © 1988 by the Weed Science Society of America 

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