稀播春小麦叶面积动态变化及产量构成特点研究

为了分析春小麦的生长发育规律及产量构成因素的变化,依品种的特征特性及环境关系,选用旱肥型的新克旱9号、抗旱型的东农7742、水肥型的克丰4号和耐湿型的克涝3号4个不同生态类型小麦品种,在稀播条件下对叶面积的动态变化和产量形成特点进行了系统研究,结果表明,旱肥型新克旱9号的总叶面积峰值最高,为360 cm2,显著高于其它类型。旱肥型、抗旱型品种新克旱9号、东农7742的旗叶面积峰值高于其它两个品种,其叶面积对产量的作用较水肥型、耐湿型品种明显;旱肥型品种新克旱9号株高、株穗数及千粒重对产量作用关系较大,抗旱型品种东农7742株穗数、千粒重对产量影响较大,水肥型品种克丰4号株穗数对产量作用大,耐湿型品种克涝3号的株穗数、主穗粒数和千粒重与产量关系密切。

Dynamic Change of LA and Component Charicteristics of the Yield with Sparse-Seeding Spring Wheat

Based on relationship between characters and enviroment of variety, four different eco-type genotypes, NKH9 (drought-fertility), NE7742 (drought tesistance), KF4(water-fertility) and KL3(watress resistance) were used for sparse-seeding in the study. Dynamic change of LA, charicteristics of the yield components were studied in sparse-seeding conditions. The result showed: the total LA peak of drought-fertility type NKH9 was 360 cm~2, which was higher than the other types, the peak of flag LA droughtfertility type NKH9 and drought-resistance type NE7742 was higher than the other two types. Contribution of LA to yield was significant for water-fertility type NKH9 and wetness-resistance type NE7742, than the other two types. Number of spike and 1000 grain-weight of drought-resistance type NE7742 had big effect on yield, spike number of water-fertility type KF4 had significant effect on yield, there was close relationship between yield and spike number of plant, grain number of main spike and 1000 grain-weight for the (wetness-resistance) type KL3.