Browsing by Author "Pratt, P.F."

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    Exchangeable and Non-Exchangeable Potassium as Indexes to Yield Increases and Potassium Absorption by Corn in the Greenhouse
    (2007) Schmitz, G.W.; Pratt, P.F.
    Samples of the Ap layer of 18 Ohio 'soils were subjected to greenhouse cropping with corn for 10 months. Yield response to K fertilization and total uptake of K were measured and correlated with soil analyses. Amounts of K extracted by HMOs provided a better index than did exchangeable K in predicting yield response to K fertilization. The best index to K removal from the soils that received no K we multiple regression in which K remc was calculated as a function of exchangeable K at the beginning of cropping and of K release from nonexchangeable forms to HNOs extraction. The best index to the K uptake on the check pots as a percentage of that on the K-freated pots was a multiple regression in which the uptake percentage was .calculated as a function of exchangeable K and K release to HNO3.