1．State Key Laboratory of Hydrology－Water Ｒesources and Hydraulic Engineering，Nanjing Hydraulic Ｒesearch Institute，
Nanjing 210029，China; 2．College of Water Conservancy and Hydropower Engineering，Hohai University，Nanjing 210024，China;
3．School of Water Ｒesources and Hydropower Engineering，Wuhan University，Wuhan 430072，China
In this paper, the paddy fields in the Poyang Lake basin were the research object, "Luliangyou 996" early rice was used as a test material, using multi-factor randomized block design, the dynamic change characteristics of the rice′s leaf SPAD values along with growth progression under different irrigation patterns, nitrogen application levels and topdressing methods were studied, the interaction of water-nitrogen coupling on SPAD values and yield and the relationships between SPAD values and yield in each growth stage were analyzed, and influence mechanism of irrigation, fertilization and topdressing on rice′s leaf SPAD values were expounded. The results showed that, the influence of irrigation and topdressing on SPAD values was reflected in the stage of reproductive growth, while the amount of nitrogen applied was reflected in the whole growth period. Nitrogen application can significantly increase leaf SPAD values and yield, but the contribution of nitrogen fertilizer to production showed marginal effects. The three-time fertilization method can significantly delay the decline of SPAD values and improve crop yield. The interaction between irrigation mode, nitrogen application rate and topdressing method was not significant. Improving the leaf chlorophyll content of the leaves during the grain-filling stage is an effective method to stabilize or even increase production. From the perspective of water saving and increasing yield, the optimal field management measures are W1N2F2, and the leaf SPAD values in the grain-filling stage is maintained between 37-40.
ZHU Han, SHI Yuan-zhi, HONG Da-lin, CHENG Yi-fan, WANG Li.
Effects of Water and Fertilizer Application on Leaf SPAD Values and Yield of Rice[J].China Rural Water and Hydropower, 2019(11): 50-53
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