Effects of Long-term Spent Straw Incorporation on Organic Carbons in Soil and Carbon Pool Management at Two-crop Rice Fields

FANG Kai; SUN Lili; ZHOU Changmin; ZHANG Qiao; GU Wenjie; LU Yusheng; XIE Kaizhi; XU Peizhi

doi:10.19303/j.issn.1008-0384.2022.009.014

Volume 37 Issue 9

Sep. 2022

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Article Navigation > Fujian Journal of Agricultural Sciences > 2022 > 37(9): 1216-1224

FANG K, SUN L L, ZHOU C M, et al. Effects of Long-term Spent Straw Incorporation on Organic Carbons in Soil and Carbon Pool Management at Two-crop Rice Fields [J]. Fujian Journal of Agricultural Sciences，2022，37（9）：1216−1224 doi: 10.19303/j.issn.1008-0384.2022.009.014

Citation:

FANG K, SUN L L, ZHOU C M, et al. Effects of Long-term Spent Straw Incorporation on Organic Carbons in Soil and Carbon Pool Management at Two-crop Rice Fields [J]. Fujian Journal of Agricultural Sciences，2022，37（9）：1216−1224 doi: 10.19303/j.issn.1008-0384.2022.009.014

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Effects of Long-term Spent Straw Incorporation on Organic Carbons in Soil and Carbon Pool Management at Two-crop Rice Fields

doi: 10.19303/j.issn.1008-0384.2022.009.014

FANG Kai^{1, 2
,},
SUN Lili^{1, 2},
ZHOU Changmin^{1, 2},
ZHANG Qiao³,
GU Wenjie^{1, 2},
LU Yusheng^{1, 2},
XIE Kaizhi^{1, 2
,
,},
XU Peizhi^{1, 2
,
,}

1.
College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu　730070, China
2.
Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou, Guangdong　510640, China
3.
Guangdong Agricultural Environment and Cultivated Land Quality Protection Center, Guangzhou, Guangdong　510500, China

Received Date: 2022-03-31
Rev Recd Date: 2022-05-29

Available Online: 2022-08-29

Publish Date: 2022-09-30

Abstract

Abstract

Objective Fertility and organic carbons in soil as affected by long-term post-harvest incorporation of spent rice straws on a typical red earth, two-cropping rice field in southern China were studied for better farming management. Method On the lots, treatments with applications of no fertilizer (CK), chemical fertilizer (NPK), or spent rice straws+chemical fertilizer (M) were implemented. After the late season, 2^nd crop of rice was harvested in 2020, samples in the tillage layer (0-20 cm) at the test lots were collected to determine the organic carbons (OC), microbial biomass carbon (MBC), nitrogen, and other fertility indicators in the soil. Result The long-term incorporation of straw discards by plowing them back into the field along with chemical fertilizer significantly improved the soil fertility. The M treatment altered the OC composition with significantly increased free particulate carbon (FPOC) and soluble particulate carbon (DOC), over CK (P＜0.05). The carbon pool in soil was enriched more than NPK treatment, especially, the content of granular OC of 2.32 g·kg⁻¹ was significantly higher under M treatment than 1.94 g·kg⁻¹ under NPK. Compared with CK, the MBC increased by 21.94% under NPK, and even higher, by 25.98%, under M. In addition, M also raised the nutrients, such as alkali-hydrolyzable nitrogen (AN), available phosphorus (AP), and available potassium (AK), in the soil at the two-crop rice fields. Conclusion By turning discarded straws into the rice field after harvest along with chemical fertilization, the carbon pool, OC composition, nutrients in the soil, as well as farming management, were significantly improved. Aside from AP, pH and total phosphorus (TP) were the other important factors affecting the carbon pool in the rice field. With the incorporation of spent straws as described in this article AP in soil benefitted as well.
- Spent straw incorporation,
- two-crop rice cultivation,
- organic carbons,
- carbon pool management,
- reactive organic carbon

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References(48)

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