Abstract: The effect of foliar spray of iron fertilizers and application of sulphur， organic fertilizer， lignin iron fertilizer in soils on the chlorosis in mulberry （Morus alba L. cv. Guisangyou 62） was studied by field experiments， to explore ways to overcome mulberry chlorosis in paddy soils. The results showed that mulberry leaf biomass and the content of chlorophyll and active Fe significantly increased within 14 days after spraying FeSO4， FeSO4 dissolved in urea solution， or iron citrate. The application of sulphur and organic fertilizers resulted in remarkable decrease in soil pH while induced remarkable increase in mulberry leaf biomass， and the content of available Fe in soils， chlorophyll and Fe in the leaves. The rate of mulberry leaf yield increased in the treatment with organic fertilizer application ranged from 43.0% to 47.1%. Moreover， the effect of sulphur and organic fertilizers on Fe nutrition and leaf yield in summer and autumn mulberry continued at significant levels for at least 46 d， 8 months and 54， 305 d， alternatively. The available Fe in soils， Fe content in leaves and mulberry leaf biomass were elevated in varying degrees after the application of lignin Fe. Although the effect of lignin Fe on soil pH was not significant， soil pH decreased significantly and the content of available Fe in soils and Fe in leaves increased significantly after application of lignin Fe composited with organic fertilizers. Furthermore， positive effect of lignin Fe and lignin Fe composited with organic fertilizer on soil available Fe， leaf Fe nutrition and leaf growth was exhibited within 73 and 236 d after the application， and the effect on soil pH and Fe availability continued for at least 13 months at significant levels. It was concluded that foliar spray of Fe fertilizers was a high\|effective measure for alleviating mulberry chlorosis， and the application of sulphur， organic fertilizer， lignin iron， lignin iron composited with organic fertilizers to soils was a long\|term measures to deal with mulberry chlorosis in paddy soils.

Key words: mulberry, chlorosis, iron fertilizer, organic manure