Study on coupling effect of salt and fertilizer application on oil sunflower in salt soil of Subei coastal mudflat
苏北沿海滩涂盐土上油葵盐肥效应研究

A field experiment was carried out in the coastal mudflat in Yancheng, Jiangsu Province to study the coupling effects of salt and fertilizer application on oil sunflower in different concentrations salt soil in 2008. The results were as follows:①Compared to the S1 (the salt concentration of soil was 1.3-1.6 g/kg), there was no significant decrease of oil sunflower seed yield in S2 (the salt concentration of soil was 2.9-3.6 g/kg). The seed yield of oil sunflower decreased with the increase of salt concentration of soil (the salt concentration of soil was 5.9-6.8 g/kg). The biological yields of stem and leaf, root, height of stem changed similarly to seed yield with the change of salt concentration of soil. The biological yield and the height of stem increased with the increase of N and P additions.②The effects of N and P additions increased with the increase of salt concentration of soil. The oil sunflower' main stem became longer and thicker with the increase of N and P. The changes of the diameter and weight of disc, shoot and root were similar to the stem with the increase of N and P in soil with different salt concentrations.③The variance analysis o showed that the effects of salt concentration of soil, fertilizers of N and P, interact of salt and interact of fertilizer N and P were significant at the lever of F_(0.05) and F_(0.01). Through the analysis of alternant effects, the factors for the yields was salt concentration of soil, then followed by fertilizers of N and P.