Abstract:

To explore the effects of continuous application of different organic fertilizers on facility tomatoes, a three-year continuous field experiment was conducted. The commonly used farmyard manure by farmers (CK) was used as the control, and the effects of bio-organic fertilizer (BOF), composted chicken manure and mushroom residue (CMOF), and composted pig manure and mushroom residue (PMOF) on fruit yield and quality, soil comprehensive properties and disease incidence were studied. The results showed that compared with CK, CMOF and PMOF increased the total tomato yield by 5.35% and 3.98%, respectively, while BOF decreased the total yield by 2.26%. CMOF and PMOF reduced the nitrate content in fruits by 28.7 and 35.9 mg/kg, respectively. CMOF and PMOF both increased soil pH and organic matter content, and PMOF had a significant increase. Both treatments reduced soil electrical conductivity to a certain extent. CMOF significantly increased available potassium, while PMOF slightly decreased available potassium. BOF significantly increased soil pH, but decreased soil electrical conductivity, organic matter and available nitrogen, phosphorus and potassium nutrients. CMOF and PMOF improved soil bulk density, while BOF deteriorated soil bulk density. PMOF and CMOF significantly increased the number of soil bacteria and actinomycetes, CMOF increased the number of Bacillus, while PMOF significantly reduced the number of fungi. BOF had no proliferative effect on the number of microorganisms and significantly reduced the number of fungi and Trichoderma. The incidence of root-knot nematodes was significantly lower in CMOF and PMOF than in CK and BOF. In conclusion, CMOF and PMOF can significantly increase tomato yield, improve soil microbial properties, reduce the incidence of nematodes and improve some soil chemical properties. BOF has a low input, although it is beneficial to reduce excessive salt and nutrients, the organic matter content is significantly reduced and the improvement effect on soil microbial properties is very limited.

Key words: facility tomatoes, well-rotted organic fertilizer, soil properties, microbial communities, yield