Effects of Biochar Application and Reducing Irrigation Amount on Soil Agglomeration Structure and Yield of Winter Wheat

doi:10.11924/j.issn.1000-6850.casb2024-0382

Abstract

Abstract:

To explore the influence of biochar on soil structure and wheat yield under different irrigation conditions, the experiment was conducted in combination of field experiment and indoor experiment. Two levels of biochar application, 0 t/hm² (B₀) and 20 t/hm² (B₁), and two levels of irrigation amount, 4500 m³/hm² (W₀) and 4050 m³/hm² (W₁) were set to investigate the distribution of soil aggregates, stability changes and wheat yield. The results showed that the application of biochar and the reduction of irrigation water would affect soil aggregate distribution and soil aggregate stability. In the 0-20 cm soil layer, biochar application increased the soil aggregate content of > 2 mm GMD and MMD, but reduced irrigation would decrease the soil aggregate content of > 2 mm and reduce the stability of soil mechanical aggregate. In the soil layer of 20-40 cm, the trend between each treatment was basically consistent with that of the 0-20 cm soil layer. However, the application of biochar in conjunction with reduced irrigation can maintain the stability of soil mechanical aggregates and increase winter wheat yields to a certain extent. The highest winter wheat yield was recorded in B₁W₁ treatment, which was 9.73 % higher than that of B0W0 treatment. In conclusion, under the conditions of this experiment, the appropriate reduction of irrigation volume (4050 m³/hm²) and the application of biochar (20 t/hm²) could significantly improve the distribution and stability of soil aggregates in wheat fields in the irrigated area, which was conducive to the improvement of soil structure and the increase of wheat yield.

Key words: biochar, irrigation water quantity, soil stability, winter wheat yield, soil aggregate, irrigation conditions, soil structure

LI Tingyu, SHEN Yi, TONG Junfei, LU Shunfeng, LI Qin, GUO Song, YANG Weijun. Effects of Biochar Application and Reducing Irrigation Amount on Soil Agglomeration Structure and Yield of Winter Wheat[J]. Chinese Agricultural Science Bulletin, 2024, 40(36): 110-116.

Figures/Tables 5

References 38

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