Effect of Continuous Application of Biochar on Soil Phosphorus Forms and Adsorption and Release Characteristics in Greenhouse

doi:10.11924/j.issn.1000-6850.casb2020-0347

Abstract

Abstract:

In view of the problems of excessive accumulation and easy loss of soil phosphorus caused by long-term application of large amounts of organic fertilizer in greenhouse, this study intends to increase phosphorus adsorption in soil and reduce phosphorus loss by applying biochar. In addition, the effect of continuous application of biochar on the form and effectiveness of soil phosphorus in greenhouse was unclear, a long-term positioning experiment in pepper greenhouses was conducted to study the effects of continuous application of biochar on soil available phosphorus content, different forms of phosphorus, phosphorus adsorption and release. The results show that the application of biochar with pig manure straw organic fertilizer (15 t/hm²) could significantly increase the soil organic carbon content and soil pH, and significantly change the content of soil phosphorus components, significantly increase NaHCO₃ P_i, NaHCO₃ P_o, Fe/Al-P_i and Ca-P_i content, and significantly reduce Ca-P_o content. In addition, the continuous application of biochar in four seasons could also increase the adsorption of soil phosphorus, thereby reducing the release of soil phosphorus. The results of this study indicates that long-term application of large amounts of organic fertilizer in the facility soil combined with biochar could increase the adsorption of soil phosphorus while maintaining the effective supply of soil phosphorus, thereby reducing the risk of soil phosphorus loss.

Key words: greenhouse soil, organic fertilizer, biochar, soil phosphorus classification, phosphorus adsorption, phosphorus release

CLC Number:

S365

Wang Qiujun, Xu Liping, Guo Dejie, Wang Guangfei, Liang Yonghong, Ma Yan. Effect of Continuous Application of Biochar on Soil Phosphorus Forms and Adsorption and Release Characteristics in Greenhouse[J]. Chinese Agricultural Science Bulletin, 2021, 37(11): 114-121.

Figures/Tables 8

References 26

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处理	基肥					追肥
处理	生物炭	有机肥	复合肥(15-15-15)	尿素	硫酸钾	复合肥(15-15-15)	尿素	硫酸钾
CK	0	0	0	0	0	0	0	0
OF	0	15000	450	75	63	555	90	75
BOF	15000	15000	450	75	63	555	90	75

处理	基肥					追肥
处理	生物炭	有机肥	复合肥(15-15-15)	尿素	硫酸钾	复合肥(15-15-15)	尿素	硫酸钾
CK	0	0	0	0	0	0	0	0
OF	0	15000	450	75	63	555	90	75
BOF	15000	15000	450	75	63	555	90	75

处理	有效磷/(mg/kg)	全磷/(g/kg)	有机碳/(g/kg)	pH	电导率/(μS/cm)
CK	118.7±7.2b	1.0±0.0b	11.8±0.3c	7.4±0.0a	66.0±2.0b
OF	320.6±43.5a	2.0±0.2a	18.3±0.5b	6.8±0.1c	273.5±50.5a
BOF	336.6±35.6a	1.9±0.4a	28.5±0.1a	7.2±0.0b	295.7±29.1a

处理	有效磷/(mg/kg)	全磷/(g/kg)	有机碳/(g/kg)	pH	电导率/(μS/cm)
CK	118.7±7.2b	1.0±0.0b	11.8±0.3c	7.4±0.0a	66.0±2.0b
OF	320.6±43.5a	2.0±0.2a	18.3±0.5b	6.8±0.1c	273.5±50.5a
BOF	336.6±35.6a	1.9±0.4a	28.5±0.1a	7.2±0.0b	295.7±29.1a

处理	Langmuir			Freundlich
处理	Q_m/(g/kg)	K_l/(L/mg)	R²	K_f /(L/mg)	1/n	R²
CK	10.0	0.020	0.920	234.3	0.81	0.989
OF	1.0	0.029	0.322	4.9	1.92	0.849
BOF	10.0	0.015	0.157	277.2	0.67	0.706