Potassium Fixation and Release Characteristics of Several Normal and K-Exhausted Soils in the Middle and Lower Reaches of the Yangtse River, China

作者：Zhan, Liping; Li, Xiaokun^*; Lu, Jianwei; Liao, Zhiwen; Ren, Tao; Cong, Rihuan

来源：Communications in Soil Science and Plant Analysis, 2014, 45(22): 2921-2931.

DOI：10.1080/00103624.2014.954719

• Exhaustion
• release
• potassium
• fixation
• K-supplying ability

Potassium (K) fixation and release in soil are important factors affecting K availability to plants and the utilization efficiency of K fertilizer. Three typical soils (red soil, yellow cinnamon soil, and alluvial soil) were collected from the middle and lower reaches of Yangtse River, China, to study the K-fixation and K-release characteristics of the normal and K-exhausted soil. Results showed that K fixation of added K in K-exhausted soils were significantly (P < 0.05) greater than that of the normal soils. There were significantly (P < 0.05) negative correlations among K-fixation capacity, concentration of soil-available K, and K+ saturation. Irrespective of soil K exhaustion, K fixation of added K was in the order of red soil > yellow cinnamon soil > alluvial soil, but the cumulative amount of K released from the three soils during successive extractions with 1.0 mol L-1 nitric acid (HNO3) was in the opposite order. The cumulative amounts of K released with 1.0 mol L-1 ammonium acetate (NH4OAc) and 1.0 mol L-1 HNO3 extraction increased with the increasing numbers of extractions. The K-releasing power of soil by successive extraction decreased gradually and finally became almost constant. The release of K was lower in K-exhausted soil than in normal soil. Overall, the information obtained in this study will be helpful in formulating more precise K fertilizer recommendations for certain soils.

• 出版日期2014-12-16
• 单位华中农业大学