摘要： 采用多点氮肥单因素多水平试验研究了河北省不同土壤类型不同地力水平条件下,冬小麦拔节期茎基部 NO₃^-含量与产量的相关关系,发现拔节期茎基部 NO₃^-浓度随施肥水平的提高呈直线增加。小麦拔节期茎基部NO₃^-含量与其收获期籽实产量密切相关,在土壤肥力高中低三种不同条件下,相应最高产量分别为 7639,6762,4241 kg/hm²,最高产量之氮肥施用量分别为 207,194,100 kg/hm²,相应拔节期植株茎部的 NO₃^-含量分别为1600,1145,671 mg/kg,较好地显示了氮肥的丰缺临界浓度。研究表明,在河北省冬小麦主产区,冬小麦拔节期茎基部NO₃^-含量可以作为氮素推荐施肥的指标。

关键词: 冬小麦, 植株诊断, 氮肥推荐, 施肥, 指标

Abstract: It had been demonstrated that NO3- N concentration in plant at jointing stage could be used as nitrogen fertilizer application recommendation indexes on winter wheat in arid and semi-arid area. The present experiment studied NO3-N concentration in wheat stem in different type soils with different nitrogen fertilzer application and its relationship to wheat grain produc-tion. Results showed that NO3- N in base of stem at jointing stage had significant correlative re-lationship with the grain yield. NO3- N concentration in base of wheat stem at jointing stage in-creased with nitrogen fertilizer rate,and the wheat grain yield also increased with the increase of NO3- N concentration in base of wheat stem at jointing stage. The top nitrogen application in highest yields were 207,194,100 kg /ha respectively. The counterpart of highest yields were 7639?6762?4241 kg/ha. The study also showed that the highest grain yields under three of soil fertility levels NO3- N concentration in base of stem at jointing stage were 1600,1145 and 671 mg/kg.

Key words: Winter wheat, Plant, Nitrogen recommendation, Fertilizer application, Index

中图分类号: 

• S512.106.2