不同盐分滨海盐土上油葵(G101-B)的氮磷肥效应研究

Influence of N and P fertilizers on sunflower grown in different saline soil on coast

利用田间试验研究了江苏省不同盐分滨海盐土上氮磷肥对油葵(G101-B)的综合效应,结果表明,(1)盐分、N肥、P肥对油葵的产量具有显著效应,以N肥影响最大;(2)每公顷105kg氮与81kg磷的肥料组合是两种盐分盐土上的油葵获得高产的最佳氮磷用量;(3)土壤不同盐分含量明显影响N、P肥对油葵的增产效应,高盐分下N、P肥对油葵的增产作用大于低盐分;(4)过磷酸钙能增强油葵对K+的选择性运输,提高油葵植株体内离子向上运输的K+、Na+选择性比率SRK,Na,对缓解滨海盐土的盐害有明显作用。

A field experiment was conducted in the coast of Jiangsu province, China, in which four rates of N and P fertilizers were applied to soil in order to study the effect of their application on biological responses of sunflower (G101-B) in different salinity soils. Results showed that (1) Salinity, N and P fertilizers application led to significant differences in the yield of sunflower, especially N fertilizer. (2) The highest yield of sunflower seeds was obtained in the application of N by 105kg/ha and P by 81kg/ha in both low (0.12～0.15%) and high (0.28～0.35%) salinity. (3) The action of N and P fertilizers on the yield of Sunflower were strongly affected by salinity and did better in high salinity than in low salinity. (4) Superphosphate could promote the selective transportation of K+ in the plant and significantly increase SRK.Na of plant, which would help to decrease the harm of salinity to sunflower. 