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19 June 2018 Effects of rice (Oryza sativa L.) cultivation and soil type on potassium mobilization and transformation behavior
D.D. Zhu, L.P. Zhan, R.H. Cong, X.K. Li
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Abstract

To understand the chemical behavior of potassium (K) in soil, rhizobox experiments were conducted to study the effects of K uptake by cultivated rice and soil type on K migration and transformation in soils. The aim of this study was to guide reasonable application of K fertilizer in different soil types. The results showed that at the maximum tillering stage, the migration distances of water-soluble K (Sol-K) were 6 and 5 cm, the depletion of exchangeable K (Ex-K) was 7 and 4 cm, and depletion of nonexchangeable K (Nonex-K) was 1 and 5 cm, respectively, in yellow cinnamon soil (YCS) and fluvo-aquic soil (FS). With the growth of rice, the migration distances of Sol-K showed little difference between YCS and FS. Throughout the season, the contributions of Sol-K, Ex-K, and Nonex-K to K uptake in YCS were 12.0%, 40.0%, and 48.0%, respectively, whereas their contributions in FS were 25.7%, 25.8%, and 48.5%, respectively. K uptake by rice was linearly related to the concentration of different forms of K in soils (R2 = 0.687*). In conclusion, soil type significantly affected K mobilization and transformation behavior. This indicated that the location of K fertilizer addition in the root zone should differ with soil type.

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D.D. Zhu, L.P. Zhan, R.H. Cong, and X.K. Li "Effects of rice (Oryza sativa L.) cultivation and soil type on potassium mobilization and transformation behavior," Canadian Journal of Soil Science 98(3), 500-507, (19 June 2018). https://doi.org/10.1139/cjss-2018-0029
Received: 8 March 2018; Accepted: 10 May 2018; Published: 19 June 2018
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KEYWORDS
depletion
épuisement
mobilisation et transformation
mobilization and transformation
potassium du sol
potassium in soil
root zone
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