Effects of Municipal Solid Waste Compost Supplemented with Inorganic Nitrogen on Physicochemical Soil Characteristics, Plant Growth, Nitrate Content, and Antioxidant Activity in Spinach

Horticulturae

卷:7

Rui M. A. Machado¹  Miguel Robalo¹  Rui Ferreira²  Isabel Alves-Pereira² 

[1] MED—Mediterranean Institute for Agriculture, Environment and Development & Departamento de Fitotecnia, Escola de Ciências e Tecnologia, Universidade de Évora, 7002-554 Évora, Portugal;

[2] MED—Mediterranean Institute for Agriculture, Environment and Development & Departamento de Química, Escola de Ciências e Tecnologia, Universidade de Évora, 7002-554 Évora, Portugal;

关键词: soil organic matter;    acidic soil;    pH;    nitrogen;    nutrient uptake;    photosynthetic pigments;   

DOI  :  10.3390/horticulturae7030053

来源: DOAJ

【 摘 要 】

In this study, we evaluated the effects of municipal solid waste compost supplemented with inorganic N on the physicochemical properties of soil, plant growth, nitrate concentration, and antioxidant activity in spinach. Experiments were carried out in neutral and acidic soils that were low in organic matter. A fertilized soil was used as a control, while four compost treatments—two compost rates of 35 and 70 t ha⁻¹, supplemented or not with inorganic N (92 kg N ha⁻¹ as Ca (NO₃)₂)—were applied by fertigation. The addition of compost increased the soil organic matter content and pH in both soils. The compost supplementation with N greatly increased the shoot dry weight and spinach fresh yield by nearly 109%. With the highest compost rate and 43% N applied, the yield increased in both soils, similar to results obtained in fertilized soil (3.8 kg m⁻²). The combined application of compost and N could replace inorganic P and K fertilization to a significant extent. The compost application at both rates and in both soils considerably decreased shoot Mn concentrations.

【 授权许可】

Unknown