In order to understand the soil fertility status of greenhouse vegetables in Yinan County,Shandong Province,soil samples were collected from greenhouse cucumber and tomato in six towns and one street to determine the soil nutrients,such as pH,salinity,organic matter,total nitrogen,total phosphorus,total potassium,alkali-hydrolyzed nitrogen,available phosphorus,available potassium and so on.The soil fertility was comprehensively evaluated by Nemerow index method.The results showed that there are acidification problems in greenhouse tomato and cucumber,with slightly acidic proportions of 25.00%and 44.83%,respectively.The light salinization and non-salinization of greenhouse cucumber were 43.75%and 34.37%,respectively.Whereas non-salinization,light salinization and moderate salinization of greenhouse tomato were 34.48%,31.03%and 24.14%,respectively.Except for total potassium(moderate level),the soil fertility status of greenhouse cucumber and tomato were in high grade and very high grade.Integrated soil quality evaluation grade of greenhouse cucumber belonged to average and fertile.While greenhouse tomato belonged to lean,average and fertile.The soil fertility was mainly influenced by the salt content,total potassium,and pH.Since soil acidification and salt accumulation were related to surface accumulation of excessive nitrogen and phosphorus,nitrogen/phosphorus fertilizer should be reduced according to soil nitrogen/phosphorus contents,and potassium fertilizer should be applied appropriately to reduce soil salinization and acidification,and maintain high fertility.
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万方数据
