Effects of modified fruit-wood biochar on phosphorus availability in calcareous soil and wheat growth

doi:10.14088/j.cnki.issn0439-8114.2026.02.008

Abstract

Abstract: To investigate the regulatory effects of fruit-wood biochar modified by different chemical methods on phosphorus availability in calcareous soil and wheat growth, and to optimize the application strategy of biochar in phosphorus management, the effects of fruit-wood biochar modified by KH₂PO₄, citric acid, and HCl on the available phosphorus content in calcareous soil, the dry weight of wheat, and the phosphorus uptake in wheat shoots were systematically evaluated through an incubation experiment and a pot experiment. The results showed that among the three modified treatments, there was no significant difference in the available phosphorus content between the rinsed and unrinsed biochar, so the unrinsed biochar was uniformly used in the subsequent experiments. The modification with KH₂PO₄ significantly increased the available phosphorus content of the biochar. After application to the soil, it could release phosphorus, causing the soil available phosphorus content to reach a peak at 14 days and maintain a relatively high level for a long period. At an application rate of 2.0%, a second release peak appeared at 40 days, demonstrating a good slow-release property. The biochar modified by KH₂PO₄ showed the best effect at an application rate of 1.0%, which not only significantly increased the dry weight of wheat but also significantly enhanced the phosphorus uptake in wheat shoots. After the application of biochar modified by citric acid or HCl to the soil, there was no obvious change in the soil available phosphorus content. The biochar modified by KH₂PO₄ was more suitable as a slow-release phosphorus carrier for the amelioration of calcareous soil.

Key words: modified biochar, fruit-wood, calcareous soil, phosphorus, availability, wheat growth

CLC Number:

S158.3

FAN Yi-xuan, JIANG Wen-qian, LI Ze-yu, WANG Xu-dong, ZHANG Yu-lin. Effects of modified fruit-wood biochar on phosphorus availability in calcareous soil and wheat growth[J]. HUBEI AGRICULTURAL SCIENCES, 2026, 65(2): 48-56.

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