Effects of organic materials on soil microbial biomass, mineral nitrogen content and rice yield

doi:10.3969/j.issn.1004-1524.20240456

Acta Agriculturae Zhejiangensis ›› 2025, Vol. 37 ›› Issue (6): 1309-1318.DOI: 10.3969/j.issn.1004-1524.20240456

• Environmental Science • Previous Articles Next Articles

Effects of organic materials on soil microbial biomass, mineral nitrogen content and rice yield

LIN Xiaobing¹^,²(), LI Jiang³, CHENG Yanhong¹^,^*(), WANG Binqiang¹, HE Shaolang¹^,², HUANG Shangshu¹, HUANG Qianru¹

1. Key Laboratory of Arable Land Improvement and Quality Improvement of Jiangxi Province, National Engineering and Technology Research Center for Red Soil Improvement, Jiangxi Province Scientific Observation and Experimental Station of Arable Land Conservation, Ministry of Agriculture and Rural Affairs, Jiangxi Institute of Red Soil and Germplasm Resources, Nanchang 331717, China
2. College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China
3. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China

Received:2024-05-23 Online:2025-06-25 Published:2025-07-08

Abstract

Abstract:

In the present study, a field plot experiment was conducted to investigate the effect of application of organic materials[Radix puerariae residues compost (PC), compost of Radix puerariae residues and biochar (PBCC), vermicompost of Radix puerariae residues (PVCC), straw biochar (BC) and vermicompost of cow dung (VC)] with reduced amount of chemical fertilizer on content of soil dissolved organic carbon (DOC), nitrate nitrogen ( $NO 3 -$ -N), ammonium nitrogen ( $NH 4 +$ -N), total reducing substances, microbial biomass carbon (MBC), microbial biomass nitrogen (MBN) and rice yiel, with the common fertilization as control (CK). It was shown that at the maturity stage, all the treatments with application of organic materials significantly (P<0.05) increased soil MBC content by 89.37%-161.84% than that of CK. Beseides, compared with the CK, BC treatment significantly increased soil MBN content by 108.36%; BC, PC, PVCC treatments significantly increased soil $NO 3 -$ -N content by 51.16%-103.88%; VC and BC treatments significantly increased soil $NH 4 +$ -N content by 44.39%, 37.07%, respectively; VC and PVCC treatments significantly increased soil DOC content by 59.70% and 50.99%, respectively. There was no difference in rice yield among treatments. In general, application of proper organic material with reduced amount of chemical fertilizer could improve soil fertility, decrease the input of chemical fertilizers without any adverse effect on rice yield. Under this experiment condition, PVCC treatment showed the best performance.

Key words: organic materials, vermicomposting, mineral nitrogen, rice, yield

CLC Number:

S141
S147

LIN Xiaobing, LI Jiang, CHENG Yanhong, WANG Binqiang, HE Shaolang, HUANG Shangshu, HUANG Qianru. Effects of organic materials on soil microbial biomass, mineral nitrogen content and rice yield[J]. Acta Agriculturae Zhejiangensis, 2025, 37(6): 1309-1318.

Figures/Tables 8

Table 1 Basic properties of different organic materials

有机物料 Organic materials	pH值 pH value	有机质含量 Organic matter content/(g·kg^-1)	全氮含量 Total nitrogen content/%	全磷含量 Total phosphorus content/%	全钾含量 Total potassium content/%
秸秆生物质炭Straw biochar	9.27	603.4	0.51	0.70	1.70
牛粪蚯蚓堆肥Vermicompost of cow dung	8.04	380.2	0.90	0.60	0.81
葛渣堆肥Radix puerariae residues compost	8.53	494.0	2.41	0.43	0.77
葛渣生物质炭堆肥	9.40	504.6	1.63	0.50	0.93
Compost of Radix puerariae residues and biochar
葛渣蚯蚓堆肥Vermicompost of Radix puerariae residues	8.97	382.5	0.95	0.50	0.80

Table 2 Fertilizer management of treatments kg·hm-2

处理 Treatment	基肥种类及其施用量 Application rate of basal fertilizers				追肥种类及其施用量 Application rate of topdressing
处理 Treatment	有机物料 Organic materials	尿素 Urea	钙镁磷肥 Calcium magnesium phosphate	氯化钾 Potassium chloride	尿素 Urea
CK	0	212.50	718.75	200.00	140.62
BC	3 000	192.33	335.28	97.59	128.22
VC	3 000	177.30	390.24	151.20	118.20
PC	3 000	119.11	483.67	153.61	79.41
PBCC	3 000	149.16	445.20	143.98	99.44
PVCC	3 000	175.38	445.20	151.81	116.92

Fig.1 Effects of treatments on content of soil microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN) Bars marked without the same letters indicate significant difference within treatments at P<0.05 at the same growth stage. The same as below.

Fig.2 Effects of treatments on content of soil nitrate nitrogen (NO 3 --N) and ammonium nitrogen (NH 4 +-N)

Fig.3 Effects of treatments on content of soil dissolved organic carbon

Fig.4 Effects of treatments on content of soil total reducing substances

Fig.5 Effects of treatments on rice grain yield

Fig.6 Correlation of soil physiochemical indexes and rice yield NO 3 --N, Soil nitrate nitrogen content; NH 4 +-N, Soil ammonium nitrogen content; MBC, Soil microbial biomass carbon content; MBN, Soil microbial biomass nitrogen content; DOC, Soil dissolved organic carbon content; TRS, Soil total reducing substances content; Y, Rice yield. “*” “**” and “***” indicate significant correlations at P<0.05, P<0.01 and P<0.001 level, respectively.

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Effects of organic materials on soil microbial biomass, mineral nitrogen content and rice yield

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