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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (5): 109-115.doi: 10.11924/j.issn.1000-6850.casb2022-0134

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Evaluating Fertile Topsoil Construction in Aeolian-sandy Soil in Northeast China Based on Tillage Index

LI Qing(), MIAO Shujie(), QIAO Yunfa   

  1. College of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044
  • Received:2022-02-28 Revised:2022-05-03 Online:2023-02-15 Published:2023-02-06

Abstract:

Evaluating the impact of fertile topsoil construction model on the quality of Aeolian-sandy soil in northeast China can provide a scientific basis for the selection of reasonable construction model in this area. Systematic clustering method was used to establish the minimum data set (MDS) of evaluating index of the fertile topsoil. Combined with the tillage index of the minimum data set (TI-MDS), the construction quality of the topsoil in Aeolian-sandy soil in northeast China was quantitatively evaluated across five different construction models, including conventional tillage, no tillage, breaking the plough pan, conventional tillage plus organic fertilizer and ploughing plus straw returning. Nash effective coefficient (Ef) and relative deviation coefficient (Er) were used to verify the quality. The results showed that the mean value of the full data set (TI-TDS) and TI-MDS was 0.47 and 0.48, respectively, positive correlations were shown between TI-TDS and TI-MDS (R=0.958**), and between TI-MDS and corn yield (R=0.895**). The Ef and Er were 0.909 and 0.017, respectively, which indicated that the TI-MDS was reasonable and suitable to evaluate the topsoil quality of Aeolian-sandy soil. According to the tillage index, compared to conventional tillage, the construction model of conventional tillage plus organic fertilizer could improve soil quality by a level from medium to high. However, the topsoil quality did not show significant difference among no tillage, breaking the plough pan and ploughing plus straw returning. In summary, in agricultural production process in Aeolian-sandy soil in northeast China, the construction model of conventional tillage combined with organic fertilizer is worthy of recommending.

Key words: Aeolian-sandy soil, fertile topsoil, tillage index, minimum data set