苏北沿海滩涂盐土上油葵盐肥效应研究

2008年在江苏沿海海涂进行田间试验研究了不同盐分含量土壤上油葵盐肥耦合效应.结果表明:①土壤盐分含量在2.9 ～ 3.6 g/kg时对油葵籽粒产量影响不大,但随着土壤盐分含量的增加,在5.9 ～ 6.8 g/kg时,油葵籽粒产量显著下降.随土壤盐分含量的增加,茎叶生物产量、根生物产量、株高与籽粒产量变化趋势相似.随着N肥和P肥使用量的增加,油葵籽粒产量显著增加,油葵茎叶和根生物产量与株高随着N肥和P肥使用量增加的变化趋势与籽粒产量变化相似.②随着土壤盐分含量的增加,N和P效应越明显,油葵茎粗、盘直径、盘重、茎叶重和根重在不同土壤盐分含量下,随着施N、P量的增加,其变化趋势与油葵主茎高度的变化趋势相似.③各处理措施均能影响油葵籽粒产量,经方差分析,土壤盐分含量、N肥施用量、P肥施用量、盐肥交互作用、NP肥交互作用均呈极显著关系,从处理间区别看,影响油葵产量的主要因素是土壤盐分含量,N肥和P肥次之.

Study on coupling effect of salt and fertilizer application on oil sunflower in salt soil of Subei coastal mudflat

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.