The present study, aimed to investigate the potassium status and determine the potassium (K) critical level by Mitscherlich-Bray, Cate-Nelson graphical, and Cate-Nelson variance analysis methods for corn plant (Zea mays L.) in some calcareous soils. Soil samples were collected (0-30 cm) from farmlands soils of Shahrekord Plain and selected 15 soil samples for pot experiment. Before planting, the potassium content of the soils was determined by using the of 1 N NH4OAc, AB- DTPA, 0.1M barium chloride, 0.01M calcium chloride and Mehlich 1 methods. The greenhouse experiment was carried out as a factorial in the form of completely randomized design with two factors (types of soil and potash fertilizer amount) with three replications. At the end of the vegetative period, corn plants were harvested and plant indices including; dry matter weight, K concentration, K uptake, relative yield and plant response were determined. The results of the analysis of variance showed that the main effects of soil type and potassium fertilizer were significant (p<0.01) on dry matter weight, K concentration and uptake. The results showed that different extractants, extracted varying concentrations of potassium. The average K extracted in the soils followed the order: 1N NH4OAc > AB- DTPA > 0.1 M barium chloride > 0.01 M calcium chloride > Mehlich1. Based on the correlation between potassium extracted, by 1 N NH4OAc, 0.1M barium chloride and 0.01M calcium chloride with relative yield indices, they can be considered as appropriate extractants for these soils. The results showed that the K critical level by using the Mitscherlich-Bray method in the 1N NH4OAc, 0.1M barium chloride, and 0.01M calcium chloride were 257.6, 245.8, and 40.3 mg kg⁻¹, respectively. By using the Cate-Nelson graphical method, K critical level in the 1N ammonium acetate, 0.1M barium chloride, and 0.01M calcium chloride were 260, 240, and 43 mg kg⁻¹, respectively, and by using the Cate-Nelson of variance analysis, K critical level in those extractants were 325.5, 265.2, and 53.0 mg kg⁻¹ of soil, respectively. The results of this study showed that the K critical level determined using the Cate-Nelson of variance analysis was higher than that of the other two methods. |
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