Tillage and Nitrogen Placement Effects on Yields in a Short-Season Corn/Wheat/ Double-Crop Soybean Rotation

Kansas Agricultural Experiment Station Research Reports, Apr 2017

In 2016, adding nitrogen (N) greatly improved average wheat yields, but the response to tillage and different N placement methods was minimal. Double-crop soybean yields were unaffected by tillage or the residual from N treatments that were applied to the previous wheat crop.

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Tillage and Nitrogen Placement Effects on Yields in a Short-Season Corn/Wheat/ Double-Crop Soybean Rotation

Tillage and Nitrogen Placement Efec ts on Yields in a Short-Season Corn/W heat/ Double-Crop Soybean Rotation D. W. Sweeney 0 0 Kansas State University , USA Follow this and additional works at: http://newprairiepress.org/kaesrr Part of the Agronomy and Crop Sciences Commons Recommended Citation Sweeney, D. W. (2017) "Tillage and Nitrogen Placement Effects on Yields in a Short-Season Corn/Wheat/ Double-Crop Soybean Rotation," Kansas Agricultural Experiment Station Research Reports: Vol. 3: Iss. 2. https://doi.org/10.4148/2378-5977.1379 - This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright January 2017 Kansas State University Agricultural Experiment Station and Cooperative Extension Service. Contents of this publication may be freely reproduced for educational purposes. All other rights reserved. Brand names appearing in this publication are for product identification purposes only. K-State Research and Extension is an equal opportunity provider and employer. Tillage and Nitrogen Placement Efec ts on Yields in a Short-Season Corn/ W heat/ Double-Crop Soybean Rotation Abstract In 2016, adding nitrogen (N) greatly improved average wheat yields, but the response to tillage and different N placement methods was minimal. Double-crop soybean yields were unaffected by tillage or the residual from N treatments that were applied to the previous wheat crop. Creative Commons License This work is licensed under a Creative Commons Attribution 4.0 License. This Soil and Water Management article is available in Kansas Agricultural Experiment Station Research Reports: http://newprairiepress.org/kaesrr/vol3/iss2/10 Agricultural Research Tillage and Nitrogen Placement Effects on Yields in a Short-Season Corn/Wheat/ Double-Crop Soybean Rotation Summary In 2016, adding nitrogen (N) greatly improved average wheat yields, but the response to tillage and different N placement methods was minimal. Double-crop soybean yields were unaffected by tillage or the residual from N treatments that were applied to the previous wheat crop. Introduction Many crop rotation systems are used in southeastern Kansas. This experiment is designed to determine the long-term effect of selected tillage and N fertilizer placement options on yields of short-season corn, wheat, and double-crop soybean in rotation. Experimental Procedures A split-plot design with four replications was initiated in 1983 with tillage system as the whole plot and N treatment as the subplot. In 2005, the rotation was changed to begin a short-season corn/wheat/double-crop soybean sequence. Use of three tillage systems (conventional, reduced, and no-till) continues in the same areas as the previous 22 years. The conventional system consists of chiseling, disking, and field cultivation. Chiseling occurs in the fall preceding corn or wheat crops. The reduced-tillage system consists of disking and field cultivation prior to planting. Glyphosate is applied to the no-till areas prior to planting. The four N treatments for the crop are: no-N (control), broadcast urea-ammonium nitrate (UAN; 28% N) solution, dribble UAN solution, and knife UAN solution at 4 inches deep. The N rate for the corn crop grown in oddnumbered years is 125 lb/a. The N rate of 120 lb/a for wheat is split as 60 lb/a applied preplant as broadcast, dribble, or knifed UAN. All plots except for the no-N controls are top-dressed in the spring with broadcast UAN at 60 lb/a N. Results and Discussion In 2016, conventional tillage resulted in 2 bu/a greater yield than with no-till (Table 1). Overall, fertilizing with N quadrupled wheat yield, but preplant application method (broadcast, dribble, or knife) did not affect yields. Average yield of soybean planted doublecrop after wheat harvest was nearly 40 bu/a in 2016, but was not affected by tillage systems or the residual from N fertilizer treatments that were applied to the wheat. Tillage Conventional Reduced No-till LSD (0.05) 37.8 36.8 35.8 1.1 9.8 45.5 45.1 46.4 1.4 N Fertilization No-N control Broadcast UAN † Dribble UAN Knife UAN LSD (0 .05) †UAN: urea-ammonium nitration solution , 28% N.


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D. W. Sweeney. Tillage and Nitrogen Placement Effects on Yields in a Short-Season Corn/Wheat/ Double-Crop Soybean Rotation, Kansas Agricultural Experiment Station Research Reports, 2017,