Abstract
Effects of potassium (K) fertilization, cropping history, and soil mineralogy on K fixation and availability were investigated in three sugarcane development projects. Hence, water-soluble, exchangeable, nonexchangeable, and available K (sum of water-soluble and exchangeable) was evaluated in the three projects including Haft-Tapeh (H), Karun (Ka), and Sugarcane Development Project (T) with 41, 26, and 8 years of sugarcane plantation, respectively, in the Iranian soils of Khuzestan province. According to the results, K fixation ranged from 17.74 to 129.15 mg kg−1 and with increasing K levels, its amounts and percentage (P = 0.01) increased. With less than 30 years of plantation, there were not any differences in different plantation histories with regard to K fixation and availability. Evaluation of K dynamic based on long-term experiments can effectively contribute to the determination of appropriate rates of K fertilization for sugarcane production.
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