Acta Agriculturae Zhejiangensis ›› 2026, Vol. 38 ›› Issue (6): 1246-1257.DOI: 10.3969/j.issn.1004-1524.20240487

• Environmental Science • Previous Articles     Next Articles

Effect of different organic materials and application depth on soil improvement and crop growth in coastal farmland

WANG Feng(), CHAI Weigang, ZHU Shijun, LIU Jian, YAO Hongyan, JIN Shuquan*()   

  1. Ningbo Key Laboratory of Testing and Control for Characteristic Agro-Product Quality and Safety, Ningbo Academy of Agricultural Sciences, Ningbo 315040, Zhejiang, China
  • Received:2024-06-05 Online:2026-06-25 Published:2026-07-14

Abstract:

A field experiment was carried out in a typical coastal saline-alkali cultivated soil in northern Zhejiang Province, with the annual rotation system of vegetable soybean and broccoli as the research object. The effects of different organic materials (KW: kitchen waste, MR: mushroom residue, OBF: biochar+organic fertilizer, MBF: biochar-based fertilizer) and application depth(D: Deep application, with fertilizer incorporated by rotary tillage to a depth of 30 cm; M: Shallow application, with fertilizer incorporated by rotary tillage to a depth of 20 cm; S: Surface application, with fertilizer applied to the surface of the soil layer)on soil properties and crop growth were analyzed. Our results showed that application of different organic materials could promote the growth of vegetable soybean and broccoli. Under the four treatments (D-OBF, D-MBF, M-OBF, and M-MBF), the yields of vegetable soybean and broccoli were all higher. The edamame yield reached 10.0-10.8 t·hm-2, representing a 31.6%-42.1% increase over the CK, while the broccoli yield was 16.0-16.7 t·hm-2, showing a 27.0%-32.5% increase compared to CK, and the annual economic benefit was 5 534-8 164 yuan·hm-2. Deep and shallow application treatment significantly decreased the soil EC, while deep application significantly increased the soil organic matter content in the entire topsoil layer. The organic matter content in the top surface layer (0-15 cm) under D-MBF and D-OBF treatment increased 1.7-2.2 g·kg-1and 0.9-1.4 g·kg-1in the lower surface layer (16-30 cm), respectively, compared with CK. Therefore, the application of biochar combined with organic fertilizer or biochar-based fertilizer combined with moderate deep ploughing has a good effect on the improvement of coastal saline-alkali soil, and this technology has a great potential for application in China’s coastal middle and low yield fields.

Key words: biochar, organic fertilizer, depth, coastal saline-alkali soil, yield

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