Effect of straw returning and tillage method on soil aggregates and carbon, nitrogen content in double-season rice

doi:10.3969/j.issn.1004-1524.20230320

Acta Agriculturae Zhejiangensis ›› 2024, Vol. 36 ›› Issue (6): 1347-1356.DOI: 10.3969/j.issn.1004-1524.20230320

• Environmental Science • Previous Articles Next Articles

Effect of straw returning and tillage method on soil aggregates and carbon, nitrogen content in double-season rice

XIONG Rui¹^,²(), OUYANG Ning¹^,², OU Xi¹^,², ZHONG Kangyu¹^,², ZHOU Wentao¹^,², WANG Hongrui¹^,², LONG Pan¹^,², XU Ying¹^,², FU Zhiqiang¹^,²^,^*()

1. College of Agronomy, Hunan Agricultural University, Changsha 410128, China
2. Key Laboratory of Crop Physiology and Molecular Biology, Changsha 410128, China

Received:2023-03-13 Online:2024-06-25 Published:2024-07-02

Abstract

Abstract:

To assess the impact of straw returning in conjunction with different tillage techniques on soil macroaggregate composition, soil organic carbon content, and total nitrogen content in double-season rice in southern China, a split-plot field experiment was conducted in Hunan Province. The primary plots were divided into straw returning (S1) and no straw returning (S0), while the subplots were assigned to no-tillage (NT), shallow rotary tillage (RT), and deep tillage (TT). The results showed that, compared to the other treatments, the S1+TT treatment significantly (P<0.05) enhanced the soil macroaggregate mass fraction by 1.70%-9.03% and 4.48%-30.53%, respectively, in the 0-10 cm soil layer for the early rice and the late rice. The mean mass diameter and geometric mean diameter of soil aggregates in the 10-20 cm soil layer under S1+TT treatment were significantly higher than the other treatments except S0+TT by 7.23%-18.67% and 4.35%-10.77%, respectively, for the early rice, and 5.06%-23.88% and 4.94%-23.19%, respectively, for the late rice. Furthermore, the total nitrogen content in the 10-20 cm soil layer of early rice (excluding S1+NT) and the 0-10 cm soil layer of late rice was significantly elevated by 13.04%-23.81% and 10.14%-40.74%, respectively, under the S1+TT treatment, and the soil organic carbon content in the 10-20 cm soil layer of both early and late rice, as well as the 0-10 cm soil layer of early rice, was significantly increased by 4.36%-26.70%, 3.83%-21.71%, and 3.86%-10.92%, respectively. In conclusion, deep tillage in combination with straw returning could enhance the stability of soil aggregates and increase the contents of soil organic carbon and total nitrogen, thereby promoting the stabilization of soil aggregate structure in the tillage layer and improving soil quality.

Key words: double cropping rice, straw returning, tillage method, aggregate stability

CLC Number:

S153
S345

XIONG Rui, OUYANG Ning, OU Xi, ZHONG Kangyu, ZHOU Wentao, WANG Hongrui, LONG Pan, XU Ying, FU Zhiqiang. Effect of straw returning and tillage method on soil aggregates and carbon, nitrogen content in double-season rice[J]. Acta Agriculturae Zhejiangensis, 2024, 36(6): 1347-1356.

Figures/Tables 5

References 45

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土层 Soil layer/cm	处理 Treatment	平均质量直径Mean weight diameter		几何平均直径Geometric mean weight
土层 Soil layer/cm	处理 Treatment	早稻Early rice	晚稻Late rice	早稻Early rice	晚稻Late rice
0~10	S1+TT	0.92±0.03 a	1.02±0.01 ab	0.73±0.01 a	1.08±0.03 a
	S1+NT	0.86±0.01 b	1.01±0.03 ab	0.70±0.01 c	1.03±0.01 b
	S1+RT	0.91±0.02 a	0.99±0.04 ab	0.72±0.01 ab	0.89±0.03 c
	S0+TT	0.86±0.02 b	1.03±0.03 a	0.71±0.01 bc	1.03±0.01 b
	S0+NT	0.82±0.01 c	0.87±0.04 c	0.68±0.01 d	1.07±0.02 ab
	S0+RT	0.81±0.02 c	0.97±0.01 b	0.68±0.00 d	0.82±0.02 d
10~20	S1+TT	0.89±0.01 a	0.83±0.01 a	0.72±0.01 a	0.85±0.02 a
	S1+NT	0.83±0.02 b	0.79±0.01 bc	0.69±0.01 bc	0.79±0.01 b
	S1+RT	0.80±0.01 c	0.76±0.03 cd	0.68±0.01 c	0.73±0.01 c
	S0+TT	0.88±0.02 a	0.80±0.02 ab	0.71±0.01 ab	0.81±0.01 b
	S0+NT	0.80±0.02 c	0.67±0.03 e	0.68±0.01 c	0.79±0.02 b
	S0+RT	0.75±0.00 d	0.74±0.00 d	0.65±0.01 d	0.69±0.01 d

土层 Soil layer/cm	处理 Treatment	平均质量直径Mean weight diameter		几何平均直径Geometric mean weight
土层 Soil layer/cm	处理 Treatment	早稻Early rice	晚稻Late rice	早稻Early rice	晚稻Late rice
0~10	S1+TT	0.92±0.03 a	1.02±0.01 ab	0.73±0.01 a	1.08±0.03 a
	S1+NT	0.86±0.01 b	1.01±0.03 ab	0.70±0.01 c	1.03±0.01 b
	S1+RT	0.91±0.02 a	0.99±0.04 ab	0.72±0.01 ab	0.89±0.03 c
	S0+TT	0.86±0.02 b	1.03±0.03 a	0.71±0.01 bc	1.03±0.01 b
	S0+NT	0.82±0.01 c	0.87±0.04 c	0.68±0.01 d	1.07±0.02 ab
	S0+RT	0.81±0.02 c	0.97±0.01 b	0.68±0.00 d	0.82±0.02 d
10~20	S1+TT	0.89±0.01 a	0.83±0.01 a	0.72±0.01 a	0.85±0.02 a
	S1+NT	0.83±0.02 b	0.79±0.01 bc	0.69±0.01 bc	0.79±0.01 b
	S1+RT	0.80±0.01 c	0.76±0.03 cd	0.68±0.01 c	0.73±0.01 c
	S0+TT	0.88±0.02 a	0.80±0.02 ab	0.71±0.01 ab	0.81±0.01 b
	S0+NT	0.80±0.02 c	0.67±0.03 e	0.68±0.01 c	0.79±0.02 b
	S0+RT	0.75±0.00 d	0.74±0.00 d	0.65±0.01 d	0.69±0.01 d

土层 Soil layer/cm	处理 Treatment	土壤有机碳含量Soil organic carbon content		土壤全氮含量Total nitrogen content
土层 Soil layer/cm	处理 Treatment	早稻Early rice	晚稻Late rice	早稻Early rice	晚稻Late rice
0~10	S1+TT	16.15±0.27 a	14.94±0.12 b	0.95±0.01 a	0.76±0.02 a
	S1+NT	15.55±0.32 b	15.63±0.06 a	0.93±0.06 a	0.57±0.02 c
	S1+RT	14.92±0.06 c	14.16±0.23 c	0.88±0.04 a	0.69±0.03 b
	S0+TT	14.75±0.16 c	13.05±0.10 d	0.73±0.04 bc	0.67±0.02 b
	S0+NT	14.76±0.05 c	15.58±0.51 a	0.69±0.01 c	0.54±0.04 c
	S0+RT	14.56±0.18 c	13.38±0.14 d	0.76±0.03 b	0.56±0.04 c
10~20	S1+TT	16.99±0.63 a	15.19±0.36 a	0.78±0.02 a	0.75±0.02 a
	S1+NT	14.67±0.18 d	13.41±0.25 c	0.72±0.08 ab	0.74±0.02 a
	S1+RT	16.28±0.22 b	14.63±0.37 b	0.64±0.05 b	0.64±0.02 b
	S0+TT	15.24±0.22 c	14.23±0.04 b	0.63±0.04 b	0.60±0.01 bc
	S0+NT	13.41±0.14 f	12.48±0.21 d	0.69±0.03 b	0.57±0.05 c
	S0+RT	14.04±0.05 e	13.15±0.19 c	0.64±0.02 b	0.55±0.05 c

土层 Soil layer/cm	处理 Treatment	土壤有机碳含量Soil organic carbon content		土壤全氮含量Total nitrogen content
土层 Soil layer/cm	处理 Treatment	早稻Early rice	晚稻Late rice	早稻Early rice	晚稻Late rice
0~10	S1+TT	16.15±0.27 a	14.94±0.12 b	0.95±0.01 a	0.76±0.02 a
	S1+NT	15.55±0.32 b	15.63±0.06 a	0.93±0.06 a	0.57±0.02 c
	S1+RT	14.92±0.06 c	14.16±0.23 c	0.88±0.04 a	0.69±0.03 b
	S0+TT	14.75±0.16 c	13.05±0.10 d	0.73±0.04 bc	0.67±0.02 b
	S0+NT	14.76±0.05 c	15.58±0.51 a	0.69±0.01 c	0.54±0.04 c
	S0+RT	14.56±0.18 c	13.38±0.14 d	0.76±0.03 b	0.56±0.04 c
10~20	S1+TT	16.99±0.63 a	15.19±0.36 a	0.78±0.02 a	0.75±0.02 a
	S1+NT	14.67±0.18 d	13.41±0.25 c	0.72±0.08 ab	0.74±0.02 a
	S1+RT	16.28±0.22 b	14.63±0.37 b	0.64±0.05 b	0.64±0.02 b
	S0+TT	15.24±0.22 c	14.23±0.04 b	0.63±0.04 b	0.60±0.01 bc
	S0+NT	13.41±0.14 f	12.48±0.21 d	0.69±0.03 b	0.57±0.05 c
	S0+RT	14.04±0.05 e	13.15±0.19 c	0.64±0.02 b	0.55±0.05 c

Effect of straw returning and tillage method on soil aggregates and carbon, nitrogen content in double-season rice

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