The Effect of Potash Fertility on Orchardgrass Forage Yields in Maryland
Applied Research
Erika Crowl
Agent Associate, Agriculture
University of Maryland Extension
Cockeysville
Abstract
Orchardgrass (Dactylis glomerata) is a popular forage species in the Mid-Atlantic region due to its yield potential and feed quality but it requires relatively high fertility levels, especially in a hay system where nutrients are being exported from the field. To test and demonstrate the importance of potash (potassium) fertility in orchardgrass plantings, a replicated trial was established at the Western Maryland Research and Education Center in Keedysville, MD in the fall of 2021. High (200 lbs/A), medium (45 lbs/A) and low (0 lbs/A) potash fertility rates were evaluated across three orchardgrass varieties. Consistent results were observed in 2022 and 2023 where the high and medium potash fertility program yielded significantly more per cutting and overall season dry matter yield than low potash programs. Variety ‘Potomac’ established quicker than the other two varieties, yielding more than ‘Olathe’ and ‘Rushmore II’ in the first year. No statistically significant interaction was observed between variety and potash fertility level. This project affirms the importance of maintaining proper potash fertility in orchardgrass plantings to maximize yields.
Poster has NOT been presented at any previous NACAA AM/PIC
This poster is being submitted for judging. It will be displayed at the AM/PIC if not selected as a State winner. The abstract will be published in the proceedings.
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Authors: Erika Crowl, Andrew Kness
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Crowl, E. Agent Associate, Agriculture, University of Maryland Extension, Maryland, 21030
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Kness, A. Senior Agent, University of Maryland Extension, Maryland, 21154