Interaction of Seeding and Nitrogen Rate on Grain Sorghum Yield in Southwest Kansas

Kansas Agricultural Experiment Station Research Reports, Jun 2017

This study compared drilled planted sorghum at four seeding rates to planted sorghum at three different nitrogen (N) fertility levels at two locations in southwest Kansas (Garden City and Tribune). At the Garden City location, no difference was observed in yield among the drilled seeded sorghum populations greater than 27,000 seeds/a compared to the standard planted sorghum (sorghum planted at 27,000 seeds/a with a planter at 30 in.-row spacing). At Tribune, there was no difference in yield between the drilled sorghum and the standard planted sorghum (sorghum planted at 40,000 seeds/a with a planter at 30 in.-row spacing) regardless of seeding rate. Nitrogen fertilizer did not interact with seeding rate or affect yield independently at either location. The use of normalized difference vegetation index (NDVI) to assess canopy coverage suggested that planted sorghum and drilled sorghum at population greater than 40,000 seeds/a may achieve canopy coverage at a faster rate. In general, nitrogen rate and seeding rates did not affect sorghum yield. However, we did observe that drilled planted sorghum was more at risk of irregular stand emergence and required a higher seeding rate to achieve canopy closure at a rate similar to that of planted sorghum.

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Interaction of Seeding and Nitrogen Rate on Grain Sorghum Yield in Southwest Kansas

Kansas Agricultural Experiment Station Research Reports Interaction of Seeding and Nitrogen Rate on Grain Sorghum Yield A. J. Foster 0 1 2 A. Schlegel 0 1 2 J. D. Holman 0 1 2 0 Foster , A. J.; Schlegel, A.; Holman, J. D.; Ciampitti, I. A.; Thompson, C.; and Ruiz Diaz, D. (2017) "Interaction 1 Kansas State University , USA 2 Kansas State University Agricultural Experiment Station and Cooperative Extension Service , USA Recommended Citation of Seeding and Nitrogen Rate on Grain Sorghum Yield in Southwest Kansas," Kansas Agricultural Experiment Station Research Reports: Vol. 3: Iss. 3. https://doi.org/10.4148/2378-5977.1400 See next page for additional authors Follow this and additional works at: https://newprairiepress.org/kaesrr Part of the Agronomy and Crop Sciences Commons 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 6-2017 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. No endorsement is intended, nor is criticism implied of similar products not mentioned. K-State Research and Extension is an equal opportunity provider and employer. Interaction of Seeding and Nitrogen Rate on Grain Sorghum Yield in Southwest Kansas Abstract This study compared drilled planted sorghum at four seeding rates to planted sorghum at three different nitrogen (N) fertility levels at two locations in southwest Kansas (Garden City and Tribune). At the Garden City location, no difference was observed in yield among the drilled seeded sorghum populations greater than 27,000 seeds/a compared to the standard planted sorghum (sorghum planted at 27,000 seeds/a with a planter at 30 in.-row spacing). At Tribune, there was no difference in yield between the drilled sorghum and the standard planted sorghum (sorghum planted at 40,000 seeds/a with a planter at 30 in.row spacing) regardless of seeding rate. Nitrogen fertilizer did not interact with seeding rate or affect yield independently at either location. The use of normalized difference vegetation index (NDVI) to assess canopy coverage suggested that planted sorghum and drilled sorghum at population greater than 40,000 seeds/a may achieve canopy coverage at a faster rate. In general, nitrogen rate and seeding rates did not affect sorghum yield. However, we did observe that drilled planted sorghum was more at risk of irregular stand emergence and required a higher seeding rate to achieve canopy closure at a rate similar to that of planted sorghum. Creative Commons License This work is licensed under a Creative Commons Attribution 4.0 License. Authors A. J. Foster, A. Schlegel, J. D. Holman, I. A. Ciampitti, C. Thompson, and D. Ruiz Diaz This southwest research-extension center is available in Kansas Agricultural Experiment Station Research Reports: https://newprairiepress.org/kaesrr/vol3/iss3/9 Kansas Fertilizer Research 2017 Interaction of Seeding and Nitrogen Rate on Grain Sorghum Yield in Southwest Kansas Summary This study compared drilled planted sorghum at four seeding rates to planted sorghum at three different nitrogen (N) fertility levels at two locations in southwest Kansas (Garden City and Tribune). At the Garden City location, no difference was observed in yield among the drilled seeded sorghum populations greater than 27,000 seeds/a compared to the standard planted sorghum (sorghum planted at 27,000 seeds/a with a planter at 30 in.-row spacing). At Tribune, there was no difference in yield between the drilled sorghum and the standard planted sorghum (sorghum planted at 40,000 seeds/a with a planter at 30 in.-row spacing) regardless of seeding rate. Nitrogen fertilizer did not interact with seeding rate or affect yield independently at either location. The use of normalized difference vegetation index (NDVI) to assess canopy coverage suggested that planted sorghum and drilled sorghum at population greater than 40,000 seeds/a may achieve canopy coverage at a faster rate. In general, nitrogen rate and seeding rates did not affect sorghum yield. However, we did observe that drilled planted sorghum was more at risk of irregular stand emergence and required a higher seeding rate to achieve canopy closure at a rate similar to that of planted sorghum. Introduction Drilled sorghum is normally done at super-high population at row spacing between 7.5 and 10 inches, compared to rows planted at spacing between 15 and 30 inches. Thompson (1983) , growing super-thick sorghum at the Hays Research Station from 19741977, found that sorghum planted in narrow rows (12-18 in.) often produced higher yields than when planted in wide rows (24-40 in.). Norw (...truncated)


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A. J. Foster, A. Schlegel, J. D. Holman, I. A. Ciampitti, C. Thompson, D. Ruiz Diaz. Interaction of Seeding and Nitrogen Rate on Grain Sorghum Yield in Southwest Kansas, Kansas Agricultural Experiment Station Research Reports, 2017, Volume 3, Issue 3,