The Change of SPAD Value in Flag Leaf of Late Rice and Its Relationship with Yield in Different Fertilization Mode in Northeast Jiangxi Province
[Objective] The aim was to find reasonable fertilization measures in late rice season in double cropping rice field.[Method] Based on field experiment in red paddy soil,which include CK (no fertilizer),NPK (nitrogen,phosphorus and potassium fertilizers),NPK + Ca (nitrogen,phosphorus and potassium fertilizers with lime),NPK + St (nitrogen,phosphorus and potassium fertilizers with straw),NPK + PM (nitrogen,phosphorus and potassium fertilizers with pig manure),NPK + Ca + St + PM (nitrogen,phosphorus and potassium fertilizers with lime,straw and pig manure).The characteristic of flag leaf,variation law of SPAD value and grain yield were analyzed in different treatments,then the relationship between SPAD value at different stages and grain yield was discussed.[Result] The results showed that:the length and area of flag leaf in NPK + Ca + St + PM were highest in all treatments.Compared with CK,the flag leaf lengths of NPK + St,NPK + PM and NPK + Ca + St + PM were increased by 26.4％,23.8％ and 47.6％,respectively,and their flag leaf areas were improved by 48.1％,45.3％ and 72.3％,respectively,but there was no difference among in NPK,NPK + Ca and CK.SPAD values at heading and filling stages of N fertilizer treatments were higher than CK,they were showed that:NPK + Ca + St + PM ＞ NPK + PM,NPK + St ＞ NPK + Ca,NPK ＞ CK.However,the grain yield of late rice in NPK,NPK + Ca,NPK + St,NPK + PM and NPK + Ca + St + PM were more than CK by 15.6％,15.6％,47.9％,73.9％ and 86.5％,respectively.Therefore,it was suggested that lime,straw,pig manure and inorganic fertilizer could increase significantly nitrogen content of flag leaf and improve grain yield of rice.Then,the relationship between SPAD value at different transplanting days and yield were analyzed,it was found that there was significant linear relationship (P ＜ 0.05) between the SPAD value at 82 days,89 days and 96 days after transplanting and grain yield,the correlation coefficient was about 0.83.[Conclusion] Nitrogen,phosphorus and potassium fertilizers with lime,straw,pig manure can significantly increase rice flag leaf SPAD value and yield.Rice flag leaf SPAD value can be used to characterize the yield variation,especially in the later stage of grain filling.
Late riceDifferent fertilization modeFlag leafSPAD valueYield
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