玉米新品种洛玉818群体生理指标研究

对洛玉818群体生理指标进行了研究,结果表明:洛玉818适宜种植密度为67500株/hm2,产量结构为67068穗/hm2、穗行数15.6、行粒数35.8、千粒重326.5 g,群体生产力得到了充分的发挥,产量达11454.2 kg/hm2。适宜密度下,群体各项生理指标发展协调,叶面积指数(LAI)在吐丝期最大值达到5.72,且稳定期长,成熟时仍达3.19;光合势(LAD)总量达到356.91×104(m2·d)/hm2,在各生育时期的分配合理;净同化率(NAR)与叶面积持续期(LAD)协调较好;干物质积累总量25113.7 kg/hm2,其中吐丝期以后的干物质积累量占全部积累量的60.9%;群体生长率(CGR)达256.7 kg/(hm2·d);灌浆速率始终保持在合理水平。

Study on Physiological Indexes of Colony of New Maize Variety Luoyu 818

The physiological indexes of colony of new maize variety Luoyu 818 were studied .The results showed that： under the suitable planting density 67500 plant/hm^2 , the yield structure of Luoyu 818 was as follows：the number of spike 67068 spike/hm^2 , number of row per spike 15.6, number of grain per row 35.8, and 1000-grain weight 326.5 g;the colony productivity was exerted sufficiently, and its yield reached 11454.2 kg/hm^2 .Under the condition of suitable planting density , all physiological inde-xes of Luoyu 818 colony developed harmoniously , the leaf area index （ LAI） reached the maximum value （5.72） at silking stage, and it kept at a high level for a long time and was still 3.19 at maturing stage; the gross of leaf area duration （ LAD） reached 3569100 （ m2. d）/hm^2 , and LAD distributed rationally in various growth periods;the net assimilation rate （ NAR） was well coor-dinated with LAD;the total dry matter accumulation amount was 25113.7 kg/hm^2 , and the dry matter accumulation amount after silking stage accounted for 60.9%of the total amount;the colony growth rate （CGR） reached 256.7 kg/（hm^2. d）; the grain-filling rate always stayed at a reasonable level .