Crops ›› 2021, Vol. 37 ›› Issue (5): 114-119.doi: 10.16035/j.issn.1001-7283.2021.05.017

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Study on Soil Organic Matter Content and Its Relationship with Nitrogen, Phosphorus and Potassium in Different Soil Layers of Rice-Growing Tobacco Areas in Southern Hunan

Zhou Qiyun1(), Zheng Chongyi1, Jing Yongfeng2, Liu Yongjun3, Peng Shuguang3, Chen Tao1, Liu Zhixuan1, Hu Ruiwen1, Zhou Qingming1, Li Juan1()   

  1. 1College of Agronomy, Hunan Agricultural University, Changsha 410128, Hunan, China
    2Technology Development Center, Hunan China Tobacco Industry Co., Ltd., Changsha 410109, Hunan, China
    3Hunan Institute of Tobacco Science, Changsha 410004, Hunan, China
  • Received:2021-04-02 Revised:2021-04-30 Online:2021-10-15 Published:2021-10-14
  • Contact: Li Juan E-mail:2457756251@qq.com;adalee@163.com

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Abstract:

In order to explore the soil organic matter content and its relationship with main nutrients in different soil layers in the rice-growing tobacco areas in southern Hunan. The total of 150 soil samples were collected in Changsha, Hengyang and Chenzhou areas in Hunan at the end of 2017 to study the vertical distribution of organic matter and explore the organic matter correlation with soil available nutrients. The results showed that the average organic matter in the 0-50cm soil layer in the southern Hunan rice-growing tobacco area was 25.80g/kg, which was at a suitable level, and coefficient of variation was 58.98%. Organic matter presented a surface enrichment phenomenon, which decreased with the increase of soil depth; and there was obvious spatial variability. The organic matter content of the 0-20cm soil layer was the highest in the Chenzhou tobacco area, and the organic matter content in the Changsha tobacco area was the lowest. There was a significant positive correlation between the organic matter content and the content of alkali hydrolysis N and available K, and there was no significant correlation between the organic matter content and available P. Organic fertilizer should be added to improve the fertilizer supply capacity of the soil. At the same time, deep ploughing and other measures should be taken to help the mineralization of surface organic matter. The organic matter content in the surface layer of Hengyang and Chenzhou was high, so it was necessary to help the mineralization of organic matter by deep ploughing and ridging.

Key words: Rice-growing tobacco area, Soil organic matter, Alkali hydrolysis N, Available P, Available K, Correlation

Table 1

Distribution characteristics of organic matter content in tobacco-growing soils in southern Hunan"

土层
Soil layer
(cm)		 均值
Mean
(g/kg)		 标准差
Standard
deviation (g/kg)		 变异系数
Coefficient of
variation (%)		 土壤有机质含量分布比例Distribution ratio of soil organic matter content (%)
<15.00g/kg 15.00~25.00g/kg 25.01~35.00g/kg 35.01~45.00g/kg >45.00g/kg
0.0~20.0 35.49 12.34 35.00 0.00 26.67 30.00 13.33 30.00
20.1~30.0 22.84 13.61 60.00 36.67 26.67 13.33 13.33 10.00
30.1~50.0 17.65 13.11 74.44 53.33 25.00 15.00 1.67 5.00
0.0~50.0 25.80 15.22 58.98 28.67 26.00 20.67 8.67 16.00

Fig.1

Zoning comparison of organic matter content from different soil layers The different uppercase and lowercase letters indicate significant differences at the 0.01 and 0.05 levels, respectively. The same below"

Fig.2

Comparison of the contents of alkali hydrolysis N, available P and available K in different grades of organic matter in topsoil"

Fig.3

Comparison of the contents of alkali hydrolysis N, available P and available K in different grades of organic matter in sub-topsoil"

Fig.4

Comparison of the contents of alkali hydrolysis N, available P and available K in different grades of organic matter in middle soil layer"

Fig.5

Linear correlation analysis of soil organic matter content and alkali hydrolysis N content in different soil layers"

Fig.6

Analysis of linear correlation between soil organic matter content and available P content in different soil layers"

Fig.7

Analysis of linear correlation between soil organic matter content and available K content in different soil layers"

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