Effects of Biochar and Modified Biochar Application on Phosphorus Leaching in the Coastal Saline-alkaline Paddy Soil

doi:10.11924/j.issn.1000-6850.casb2023-0309

Abstract

Abstract:

Aiming at the problems of low phosphorus (P) availability and serious leaching in saline-alkaline paddy soil of Yellow River Delta, the effects of biochar and modified biochar addition on soil P availability and P leaching risk were investigated by field experiments. There were four treatments: (1) control, CK; (2) conventional fertilization, NPK; (3) conventional fertilization + straw source biochar 8000 kg/hm²; (4) conventional fertilization + straw source iron modified biochar 8000 kg/hm². The results showed that, compared with NPK treatment, the content of total P was significantly increased with the addition of biochar and modified biochar, and the content of available P increased by more than 41%. Soil P content decreased with the increase of soil depth, and the soil total P content was the lowest in 60-80 cm soil in modified biochar added treatment. Meanwhile, soil metal oxides, soil organic carbon and dissolution organic carbon were positively correlated with soil total P, available P and water-soluble P, indicating that soil P, metal oxides and organic matter may co-migrate in soil profile. Soil P saturation decreased after the addition of modified biochar, which further indicated that the addition of modified biochar reduced the risk of soil P leaching. Therefore, biochar especially modified biochar, plays an important role in increasing soil P availability and reducing soil P leaching in the Yellow River Delta.

Key words: saline-alkaline soil, paddy fields, phosphorus, biochar, leaching

GONG Xia, CHEN Mengmeng, WANG Zhaojie, DING Xiaodong. Effects of Biochar and Modified Biochar Application on Phosphorus Leaching in the Coastal Saline-alkaline Paddy Soil[J]. Chinese Agricultural Science Bulletin, 2024, 40(8): 57-62.

Figures/Tables 7

References 26

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土层深度/cm	CK	NPK	BC	FeBC
0~20	0.09±0.00c	0.23±0.01a	0.21±0.01ab	0.20±0.01b
20~40	0.09±0.00b	0.24±0.00a	0.22±0.01a	0.22±0.00a
40~60	0.08±0.01b	0.23±0.02a	0.22±0.04a	0.20±0.01a
60~80	0.07±0.00d	0.18±0.01a	0.16±0.01b	0.14±0.01c

土层深度/cm	CK	NPK	BC	FeBC
0~20	0.09±0.00c	0.23±0.01a	0.21±0.01ab	0.20±0.01b
20~40	0.09±0.00b	0.24±0.00a	0.22±0.01a	0.22±0.00a
40~60	0.08±0.01b	0.23±0.02a	0.22±0.04a	0.20±0.01a
60~80	0.07±0.00d	0.18±0.01a	0.16±0.01b	0.14±0.01c

	AP	TP	H₂O-P	SOC	DOC	Feox	Alox	Pox	PSR
AP	1	0.928^**	0.967^**	0.931^**	0.929^**	0.900^**	0.880^**	0.946^**	0.463^**
TP		1	0.954^**	0.871^**	0.852^**	0.836^**	0.780^**	0.986^**	0.657^**
H₂O-P			1	0.863^**	0.854^**	0.814^**	0.813^**	0.971^**	0.616^**
SOC				1	0.949^**	0.968^**	0.909^**	0.886^**	0.333^*
DOC					1	0.974^**	0.881^**	0.863^**	0.223
Feox						1	0.915^**	0.848^**	0.232
Alox							1	0.805^**	0.268
Pox								1	0.665^**
PSR									1

	AP	TP	H₂O-P	SOC	DOC	Feox	Alox	Pox	PSR
AP	1	0.928^**	0.967^**	0.931^**	0.929^**	0.900^**	0.880^**	0.946^**	0.463^**
TP		1	0.954^**	0.871^**	0.852^**	0.836^**	0.780^**	0.986^**	0.657^**
H₂O-P			1	0.863^**	0.854^**	0.814^**	0.813^**	0.971^**	0.616^**
SOC				1	0.949^**	0.968^**	0.909^**	0.886^**	0.333^*
DOC					1	0.974^**	0.881^**	0.863^**	0.223
Feox						1	0.915^**	0.848^**	0.232
Alox							1	0.805^**	0.268
Pox								1	0.665^**
PSR									1