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- Title
Responses of Soil Available Phosphorus and Phosphorus Forms to Phosphorus Fertilizer Application Times.
- Authors
SHEN Yurong; LI Ran; XU Minggang; ZHOU Huaiping; LIU Ping; SUN Nan
- Abstract
The easy fixation of phosphorus fertilizer in soil is a main reason for the low utilization rate of phosphorus fertilizer. In order to study the effects of fertilization frequency on availability of phosphorus fertilizer, three cinnamon soils with different Olsen-P levels (19.4, 24.2, 49.7 mg·kg-1) were collected in the long-term fertilization test based on Shouyang County, Jinzhong City Shanxi Province, and the same amount of phosphorus fertilizer (potassium dihydrogen phosphate) was added to the soil with different Olsen-P levels by once and 3 times, respectively. The soil with Olsen-P was incubated under constant temperature condition for 90 d, soil Olsen-P content was measured by 11 sampling intervals, and the phosphorus forms in soil were measured at the end of incubation. The effects of fertilization frequency on soil Olsen-P content, phosphorus fixation rate and phosphorus forms were analyzed, and characteristics on availability of phosphorus fertilizer under different fertilization times were clarified. The results showed that after 90 d of fertilization, the soil Olsen-P contents under 3 times of application increased significantly compared with that of once of application, and the increase rates at 3 Olsen-P levels were 21.0%, 13.5% and 9.4%, respectively. However, the phosphorus fixation rate decreased significantly, which were 8.0%, 6.8% and 10.5% at 3 Olsen-P levels, respectively. The Michaelis-Menten equation betterly fitted the process of soil phosphorus fixation. The maximum phosphorus fixation rate of once application was greater than that of 3 times application, but the time to reach 50% of the maximum phosphorus fixation rate was shorter than that of 3 times application. The phosphorus fixation rate decreased with the increase of Olsen-P levers under once application. Phosphorus fixation rate in high Olsen-P (49.7 mg·kg-1) soil was significantly reduced by 10.8%~ 12.4% compared with low Olsen-P (19.4~24.2 mg·kg-1) soil under 3 times application.When compared with once application, the content of labile P in soil increased by 6.8%~12.1%, and the content of non labile P decreased by 8.4% under 3 times application. This study showed that the 3 times application of phosphorus fertilizer could significantly improve the availability of soil phosphorus and reduce the fixation rate of phosphorus fertilizer; the higher soil Olsen-P content was, the smaller the proportion of phosphorus fertilizer was invalidated in soil; the 3 times application of phosphorus fertilizer could increase soil Olsen-P content, decrease phosphorus fixation rate and increase the content of labile P. These results had important directive significance to improve the utilization rate of phosphorus fertilizer, and provided theoretical basis for efficient and scientific application of phosphorus fertilizer.
- Subjects
SHANXI Sheng (China); PHOSPHATE fertilizers; FERTILIZER application; PHOSPHORUS in soils; POTASSIUM dihydrogen phosphate; POTASSIUM; PHOSPHORUS
- Publication
Journal of Agricultural Science & Technology (1008-0864), 2023, Vol 25, Issue 10, p173
- ISSN
1008-0864
- Publication type
Article
- DOI
10.13304/j.nykjdb.2022.0421