Relationship Of Soil Nutrient Content And Nutrient Content In Tomato Leaves And Tomato Yield In Different Areas

Greenhouse is the mainly facilities to provide vegetables in Shandong province during winter and tomato was widely cultivated for vegetable production and supply. It can meet the demand of the farmers’ income. But due to the fertilization unscientific and long-term excessive or fertilization imbalanced in production, the quality and yield of tomato is decline. Those made a severe economic loss to producers, and even cause a further soil degradation and environmental pollution. Many of the domestic and foreign scholars have done a lot of work on tomato fertilization research and lay a foundation for scientific fertilization in tomato production, give us a lot of experiences. But because of the different soil conditions, environmental conditions, geographical conditions and methods of cultivation, test methods, there are large differences between the results of the study. Due to the regional environmental conditions and fertilization characteristic are different, we should analyses the fertilizing situation according to the actual situation. For these reason, this article takes the tomato greenhouse in Rizhao, Linzi, Tai’an as the object of investigation. By using the method of combining investigation and experiment, we gathered tomato leaves and soil sample in 12 villages of these three areas. We studied the soil nutrient characteristics in greenhouse after many years of tomato planting in different areas, the soil available nutrients, the relationship between soil available nutrients and the nutrient in leaves and the effect on yield. The results showed that:1 In plot experiment of different fertilizer treatments, the contents of N,P,K in leaves are different, fertilization treatments were higher than that without fertilization treat ments, and CK is the lowest. In different sampling period, nutrient content in leaves is differe nt. During the third sampling period, the nutrient content in leaves were higher than the other t hree sampling periods.2 For the soil content of alkaline hydrolysis N, available P, available K content in greenhouse of the three region: content of alkaline hydrolysis N both under 150 mg/kg, at low levels in the soil, content of available P, available K are extremely high. The soil nutrient frequency distribution curves are normally distributed. Three areas of soil electrical conductivity values were within the normal range suitable for tomato growth.3 There were great differences between the content of soil trace element Fe, Mn,Cu and Zn and middle-element Ca, Mg in greenhouse of the three region. Content of available Fe, available Mn were high in Juxian, but the other two regions is low. Content of soil available Zn are both high in three regions, and the level of effective Cu, exchangeable Ca and Mg is high in soil content.4 Three regional soil alkaline hydrolysis N, available P, available K content both reduce after increasing along with the planting years, and soil exchangeable Ca in this rule in Daiyue, but in Juxian and Linzi the content of exchangeable Ca didn’t have significant change along with the planting years. The exchangeable Mg content of the three areas are relatively stable, not a big change with the increase of the planting year. In addition to the Daiyue’s effective Mn content reduce and the available Fe content increased after reduce along with planting years. Soil trace elements Fe, Mn, Cu and Zn both increased before reduce along with the planting years in the rest of region.5 More than 80% of the total N and 70% of total K contents are in the appropriate amount of range in tomato leaves in Juxian and Fangcun, and the content of total P is relatively high in three regions. Tomato leaves is in the lack of Ca, Mg, and the variation coefficient is larger. More than half of the trace elements Fe, Mn, Zn content of tomato leaves in the three areas were in moderate range, but the variation coefficient of Mn and Zn in leaves is large.6 Correlation of soil available nutrients and leaf nutrient content in three regions were without similar regularity. There have a significant negative correlation between available Cu, Zn in soil and available Mn in leaves, soil alkaline hydrolysis N, available P, available Cu, available Mn and tomato yield was significantly negatively correlated in Rizhao. Soil available Mg and leaf total K was significantly negatively correlated, and Fe, Mg in leaves were significantly positive correlation, the soil exchangeable Ca and tomato yield was significantly negatively correlated in Linzi. In Daiyue, the available Mn and tomato yield was significantly negative correlation, exchangeable Ca and tomato yield was significantly positive related.