Scientia Agricultura Sinica ›› 2023, Vol. 56 ›› Issue (18): 3585-3598.doi: 10.3864/j.issn.0578-1752.2023.18.008

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Effects of Returning Chinese Milk Vetch and Rice Straw to Replace Partial Fertilizers on Double Season Rice Yield and Soil Labile Organic Carbon

XIE Xue1,2(), LU YanHong1,3, LIAO YuLin1,3, NIE Jun1,3, ZHANG JiangLin1,3, SUN YuTao1,3, CAO WeiDong4, GAO YaJie1,3()   

  1. 1 Hunan Soil and Fertilizer Institute, Changsha 410125
    2 College of Resources, Hunan Agricultural University, Changsha 410128
    3 Scientific Observing and Experimental Station of Arable Land Conservation (Hunan), Ministry of Agriculture and Rural Affairs, Changsha 410125
    4 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081
  • Received:2022-10-21 Accepted:2022-12-06 Online:2023-09-16 Published:2023-09-21
  • Contact: GAO YaJie

Abstract:

Objective】 The purpose of this study was to investigate the effects of replacing partial chemical fertilizers with Chinese milk vetch and rice straw on double rice yield and the soil labile organic carbon fractions, carbon pool management index of the paddy soil based on four consecutive years of field experiment. 【Method】 The double-season rice field experiment was conducted, and then yield of rice yield early and late rice, contents of soil organic carbon, soil high labile, medium labile, labile and no labile organic carbon were measured after four years experiment, then soil carbon pool management index were calculated. There were six treatments: (1) Winter fallow + N, P, K (CF); (2) Chinese milk vetch+N, P, K (MV); (3) Winter fallow + low weight of rice straw returning+N, P, K (RSl); (4) Winter fallow+high weight of rice straw returning+N, P, K (RSh); (5) Chinese milk vetch + low weight of rice straw returning+N, P, K (MV+RSl); (6) Chinese milk vetch + high weight of rice straw returning+N, P, K (MV+RSh). After harvest of late rice, 0-15 cm surface soil was collected. Potassium dichromate method was used to determine the content of soil organic carbon, and potassium permanganate oxidation method was used to determine the content of soil organic carbon with high labile (33 mmol·L-1), medium labile (167 mmol·L-1) and labile (333 mmol·L-1). 【Result】 Under the equal nitrogen, phosphorus and potassium nutrient inputs, the double-season rice yield under the MV+RSh treatment differed significantly from the CF and RSl treatments, while there was no significant difference in rice yield between the other treatments, and the total double-season rice yield was the highest under the RSl treatment at 13 347 kg·hm-2 and the lowest in the MV+RSh treatment at 11 687 kg·hm-2. After four years of continuous trials, the MV+RSh, RSh, MV+RSl, RSl, and MV treatments significantly increased soil organic carbon by 42.0%, 32.9%, 29.9%, 28.3%, and 26.3% (P<0.05), respectively; soil labile organic carbon content was increased by 23.9%-56.4% in each treatment, and soil no labile organic carbon content under MV+RSh, RSh, MV+RSl, RSl, and MV treatments significantly was increased by 37.3%, 28.6%, 25.8%, 24.1% and 23.4% (P<0.05). Compared with the CF treatment, soil high labile organic carbon was increased by 12.3%-27.7%, medium labile organic carbon was increased by 5.6%-20.0%, and labile organic carbon was increased by 9.9%-26.3% under MV+RSh, MV+RSl, MV, RSh and RSl treatments. The CF、MV、RSl、MV+RSl、RSh、MV+RSh treatments increased the soil organic carbon pool management index by 25.5%-61.7%.【Conclusion】 Under four consecutive years of equal nitrogen, phosphorus and potassium nutrient inputs, returning Chinese milk vetch and rice straw replacing part of the chemical fertilizer dosage could ensure double-season rice yields and increase soil organic carbon content, and also help to increase the content of high labile, medium labile, labile and no labile soil organic carbon, all of which were most significantly increased by the treatment of MV+RSh. The contribution of rice straw alone to the increase in soil organic carbon content was greater than that of Chinese milk vetch alone. To sum up, in the southern double-season rice area, within a certain range of substitution, the return of Chinese milk vetch and rice straw to the field could reduce the amount of chemical fertilizer and ensure rice yield, which was of great significance for green and sustainable rice production.

Key words: Chinese milk vetch returning, rice straw returning, soil organic carbon, soil labile organic carbon, rice yield

Table 1

Initial physical and chemical properties of 0-15 cm soil before experiment"

pH 土壤容重
Soil bulk density (g·cm-3)
有机质
Organic matter
(g·kg-1)
全氮
Total nitrogen
(g·kg-1)
全磷
Total phosphorus
(g·kg-1)
全钾
Total
potassium
(g·kg-1)
水解性氮
Hydrolysable nitrogen
(mg·kg-1)
有效磷
Available phosphorus
(mg·kg-1)
有效钾
Available potassium
(mg·kg-1)
5.21 1.08 19.80 1.66 0.50 25.90 171.00 16.70 66.00

Fig. 1

Timing chart of double-rice cultivation The rice straw shall be covered in the field after harvest, the straw after harvest of late rice shall be returned to field with Chinese milk vetch 15 days before the next early rice transplanting, and the rice straw after harvest of early rice shall be returned to field before the late rice transplanting"

Table 2

Specific amount of fertilizer applied in early and late rice season under different treatments"

稻季
Rice season
处理
Treatment
化肥施肥量
Amount of chemical fertilizer (kg·hm-2)
绿肥还田养分量
Nutrient of green manure input (kg·hm-2)
稻草还田养分量
Nutrient of rice straw input (kg·hm-2)
总养分投入
Total nutrient input (kg·hm-2)
N P2O5 K2O N P2O5 K2O N P2O5 K2O N P2O5 K2O
早稻
Early rice
CF 150.0 75.0 120.0 - - - - - - 150.0 75.0 120.0
MV 105.0 70.5 100.0 45.0 4.5 20.0 - - - 150.0 75.0 120.0
RSl 135.0 72.8 70.0 - - - 15.0 2.3 50.0 150.0 75.0 120.0
RSh 120.0 70.5 20.0 - - - 30.0 4.5 100.0 150.0 75.0 120.0
MV+RSl 90.0 68.3 50.0 45.0 4.5 20.0 15.0 2.3 50.0 150.0 75.0 120.0
MV+RSh 75.0 66.0 - 45.0 4.5 20.0 30.0 4.5 100.0 150.0 75.0 120.0
晚稻
Late rice
CF 180.0 75.0 120.0 - - - - - - 180.0 75.0 120.0
MV 180.0 75.0 120.0 - - - - - - 180.0 75.0 120.0
RSl 165.0 72.8 70.0 - - - 15.0 2.3 50.0 180.0 75.0 120.0
RSh 150.0 70.5 20.0 - - - 30.0 4.5 100.0 180.0 75.0 120.0
MV+RSl 165.0 72.8 70.0 - - - 15.0 2.3 50.0 180.0 75.0 120.0
MV+RSh 150.0 70.5 20.0 - - - 30.0 4.5 100.0 180.0 75.0 120.0

Fig. 2

Carbon inputs from organic materials under different treatments"

Table 3

Rice yield under different treatments"

年份
Year
处理
Treatment
产量Yield (kg·hm-2)
早稻 Early rice 晚稻 Late rice 总计 Total
2019 CF 5640a 7613ab 13253ab
MV 5253ab 7370ab 12623abc
RSl 5617a 7730a 13347a
RSh 5173ab 7127ab 12300abc
MV+RSl 5137ab 6997ab 12133bc
MV+RSh 4827b 6860b 11687c
2018 CF 6347a 8583a 14930a
MV 6500a 8263ab 14763a
RSl 6083a 8557a 14640a
RSh 6243a 8306ab 14550a
MV+RSl 6270a 7730b 14000a
MV+RSh 6187a 7793b 13980a
2017 CF 4600ab 7608a 12208a
MV 4508ab 7633a 12141a
RSl 4667ab 7508a 12175a
RSh 4375ab 7275a 11650ab
MV+RSl 4825a 7108ab 11933a
MV+RSh 4258b 6608b 10866b

Table 4

Soil organic carbon content and change of soil organic carbon stock under different treatments"

处理
Treatment
土壤有机碳含量
Soil organic carbon
(g·kg-1)
土壤有机碳累积变化量
Change of soil organic carbon stock (Mg·hm-2)
R 11.48b --
CF 13.67ab 3.55a
MV 14.50a 4.89a
RSl 14.73a 5.27a
RSh 15.26a 6.12a
MV+RSl 14.91a 5.55a
MV+RSh 16.30a 7.74a

Table 5

Change of soil labile organic carbon components stock under different treatments after 4 years of testing"

处理 Treatment HLOC (Mg·hm-2) MLOC (Mg·hm-2) LOC (Mg·hm-2) NLOC (Mg·hm-2)
CF 0.55b 0.37a 1.01a 2.54a
MV 0.67ab 0.58a 1.53a 3.37a
RSl 0.81ab 0.86a 1.79a 3.47a
RSh 1.10a 0.86a 2.00a 4.11a
MV+RSl 0.96ab 0.71a 1.85a 3.70a
MV+RSh 1.14a 1.12a 2.38a 5.36a

Fig. 3

Content of different labile organic carbon fraction"

Fig. 4

Soil carbon pool management index (CMI) under different treatments after 4 years of testing"

Fig. 5

Correlation heatmap between double rice yield and soil organic carbon component or carbon inputs (*: P≤0.05; **: P≤0.01; ***: P≤0.001)"

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