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Systems for Returning Conservation Reserve Program Land to Wheat (Triticum aestivum) Production

Published online by Cambridge University Press:  12 June 2017

Case Medlin ,
Thomas F. Peeper ,
James H. Stiegler  and
John B. Solie
Case Medlin
Affiliation:
Department of Agronomy
Thomas F. Peeper
Affiliation:
Department of Agronomy
James H. Stiegler
Affiliation:
Department of Agronomy
John B. Solie
Affiliation:
Biosystems and Agricultural Engineering, Oklahoma State University, Stillwater, OK 74078
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Abstract

Experiments were conducted near Duke and Forgan, OK, on land enrolled in the Conservation Reserve program (CRP) that had been seeded to Old World bluestem (OWB) to evaluate tillage systems for returning CRP grassland to winter wheat production. Glyphosate controlled OWB 72% or less in no-till (NT) wheat. Disk tillage (DT) and moldboard plow tillage (MPT) for wheat seedbed preparation controlled OWB 87 and 99%, respectively, at Forgan and 96 and 100%, respectively, at Duke. At Forgan, OWB control in NT was higher when glyphosate was applied in July than when applied in May. Soil water content to a depth of 120 cm at planting was as high in DT and MPT without herbicide as in NT with 1,680 g ae/ha glyphosate. Within NT and MPT, glyphosate did not consistently increase soil water content compared to the respective nontreated checks. In DT, soil water content to a depth of 120 cm was greater following glyphosate at 1,680 g/ ha than without glyphosate. Wheat density was greater in DT and MPT than in NT. Compared to the NT no herbicide treatment, tillage tripled wheat yields. Wheat yields were often greater where glyphosate was applied before tillage. No-till wheat production immediately after CPR in Oklahoma without prior destruction of accumulated OWB residue does not appear feasible.

Keywords

Glyphosate, N-(phosphonomethyl)glycineOld World bluestem, Bothrichloa ischaemum (L.) Kengihard red winter wheat, Triticum aestivum L.GlyphosateOld World bluestemCRP, Conservation Reserve programHEL, highly erodible landOWB, Old World bluestemMPT, moldboard plow tillageDT, disk tillageNT, no-tillOM, organic mattersd, standard deviation
Type
Research
Information
Weed Technology , Volume 12 , Issue 2 , June 1998 , pp. 286 - 292
Copyright
Copyright © 1998 by the Weed Science Society of America 

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