Abstract:

Improving the soil quality of protected vegetable fields is of great significance to the sustainable development of regional vegetable industry. In this study, celery was used as the test crop and four treatments were set up to study the effect of Fuhuosu amendment on soil agrochemical properties of solar greenhouse and celery quality, yield and economic benefits. Among the four treatments, the dosage of Fuhuosu amendment was 0 kg/hm² (CK), 300 kg/hm² (T₁), 600 kg/hm² (T₂) and 900 kg/hm² (T₃), respectively. The results showed that: (1) Fuhuosu amendment had no obvious effect on soil pH and soil organic matter in solar greenhouse, but it could significantly reduce soil nitrate content and soil electrical conductivity value, and soil nitrate content and soil electrical conductivity gradually decreased with the increase of the dosage of Fuhuosu amendment. When the dosage of Fuhuosu amendment was 900 kg/hm², the soil nitrate content and soil electrical conductivity were the lowest, with a decrease of 47.87% and 54.28% respectively compared with CK. (2) The plant height, diametral thickness, single plant weight and leaf SPAD of celery increased gradually with the increase of the dosage of Fuhuosu amendment. When the dosage of Fuhuosu amendment was 900 kg/hm², the plant height, diametral thickness, single plant weight and leaf SPAD of celery were the highest, and the increase rates were 8.22%, 14.14%, 2.91% and 8.88% respectively compared with CK. (3) The content of vitamin C and soluble solids in celery could be increased and the content of leaf nitrate could be decreased by applying Fuhuosu amendment. The quality of celery was the best when the dosage of Fuhuosu amendment was 900 kg/hm². (4) The yield of celery showed a gradual increase trend with the increase of the Fuhuosu amendment dosage, and yield was the maximum when the dosage of Fuhuosu amendment was 900 kg/hm². However, when the dosage was 600 kg/hm², the economic benefit was the highest and the increase income reached 2550 yuan/hm². It could be seen that the application of Fuhuosu amendment to the soil in solar greenhouse could not only reduce the nitrate content and electrical conductivity of the soil, alleviate the secondary salinization of the soil, but also promote the growth of celery plants, improve the quality and yield of celery. Considering the effects of salt reduction, quality improvement, yield and income increase, the best recommended dosage of Fuhuosu amendment was 600 kg/hm².

Key words: Fuhuosu amendment, solar greenhouse, soil electrical conductivity, celery, yield, quality