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比较了超级杂交早稻陵两优268在“三定”栽培、免耕摆栽、传统栽培条件下的产量构成特点、干物质生产特性、氮素吸收量及其利用率,结果表明:与传统栽培相比,“三定”栽培处理齐穗期后干物质积累量大、有效穗较多,产量较高,氮素吸收量分蘖中期和幼穗分化期较低,齐穗期和成熟期较高,氮肥偏生产力、氮素吸收利用率、氮肥农学利用率均较高;免耕摆栽处理有效穗较多,但每穗总粒数和结实率居劣势;氮吸收特点与“三定”栽培处理相似,但氮肥偏生产力、氮素吸收利用率、氮肥农学利用率比“三定”栽培处理略低。表明陵两优268采用“三定”栽培法可实现产量和氮肥利用率的同步提高。
The yield components, dry matter production characteristics, nitrogen uptake and its utilization rate of super hybrid rice “Lingliangyou 268” under “Sanding”, no-tillage planting and traditional cultivation were compared. The results showed that: Compared with the traditional cultivation, the dry matter accumulation, the effective panicle and the yield were higher after the heading stage of “SanDian ” cultivation and heading stage, the mid-tillering stage and panicle differentiation stage were lower, Higher NUE, partial N fertilizer use efficiency, N fertilizer use efficiency and N fertilizer use efficiency were higher; No-tillage planted to deal with more effective spike, but the total grain number and seed setting rate inferior to each other; nitrogen absorption characteristics and The cultivation of “Sanding” was similar, but the partial productivity of nitrogen fertilizer, the rate of nitrogen absorption and utilization, the rate of agronomic utilization of nitrogen fertilizer were slightly lower than that of “Sanding” cultivation. The results showed that Lingliangyou 268 was able to achieve the simultaneous increase of yield and nitrogen use efficiency by cultivating “San Ding”.