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Potassium Rate and Source Influences on Yield and Composition of Bromegrass Forage 1
Author(s) -
Laughlin Winston M.,
Martin Paul F.,
Smith Glenn R.
Publication year - 1973
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1973.00021962006500010026x
Subject(s) - bromus inermis , forage , potassium , dry matter , chemistry , agronomy , zoology , nutrient , potassium sulfate , composition (language) , fodder , yield (engineering) , field experiment , biology , linguistics , philosophy , materials science , organic chemistry , metallurgy
Objectives of the study were to determine K rate and source optima for bromegrass ( Bromus inermis Leyss.) and effect of treatments on uptake and balance of K and other nutrient elements. A 2‐year field study compared six rates of two K sources on bromegrass grown on a K‐deficient area. Dry matter yields were determined and the forage analyzed for N, P, K, Ca, Mg, AI, Ba, B, Fe, S, Sr, Cu, Zn, and Mn concentration. Each K rate increased K concentration of each cutting both years and decreased the Ca and Mg percentages. KCI increased K percentages, but had little effect on forage color, yield, or mineral uptake. Potassium sulfate increased both yields and mineral uptake. All K 2 SO 4 rates eliminated the yellow foliage color. Each K increment of this K source increased the K and S percentages and uptake. Results indicate that both K and S deficiencies were present. Of the applied N, P, K, and S brome foliage removed 70 to 194%, 36 to 76%, 109 to 155%, and 19 to 95%, respectively.