Evaluation of various concentrations of ammonium acetate in potassium extraction and its critical levels determination in some of paddy soils
Journal Title: International Journal of Farming and Allied Sciences - Year 2018, Vol 7, Issue 1
Abstract
An investigation was undertaken to evaluate different concentrations of extractant ammonium acetate (NH4OAc) for available potassium and critical levels of potassium for wetland rice soils of Guilan province in north of Iran. Some 35 soils from 0-30 cm depth were collected from different location paddy soils. Potassium in the soils was extracted with normal ammonium acetate. Based on soils were grouped in low, medium and high potassium. Finally, 19 soil samples were selected for micro plot experiment. Micro plot experiment with 2 treatment (0 and 250 mg K kg-1 of soil) and 3 replicates was performed. In this experiment, concentrations 0.1, 0.25, 0.5 and 1M extractant ammonium acetate were used for extraction potassium. Results showed that in most soils K application increased grain and straw yield and K uptake in rice plant. High correlation were observed between different concentrations of extractant ammonium acetate (NH4OAc) with K uptake and concentration in rice plant and provided useful indicators for evaluating K. The critical level of soil K was determined graphical method (Cate and Nelson). For rice, the values of critical limit were 120,119,109 and 105 mg kg-1 for concentrations 1, 0.5, 0.25 and 0.1 M extractant ammonium acetate respectively.
Authors and Affiliations
Hassan Shokri Vahed
Keywords
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