Abstract:

A field experiment was carried out to explore different seedling ages （18 d, 23 d and 28 d） on seedling quality, leaf age, tiller dynamic and yield performance, taking rice variety Ning 84 and Yongyou 538 as materials with machine transplanting. The results showed that the quality of seedling deteriorated significantly, the leaf number, plant height, panicle length and yield were decreased with the seedling age increasing. The yield of Ning 84 and Yongyou 538 with 23 d and 28 d seedling age were decreased by 0.86%, 12.80% and 2.67%, 14.71% than that of the 18 d seedling age. With the seedling age increasing, the maximum tiller number increased, the spike rate of Ning 84 was enhanced and Yongyou 538 was decreased. At the same seedling age, the seedling quality of Ning 84 was worse than Yongyou 538, but its maximum tiller number and spike rate were higher than Yongyou 538.

Key words: late season rice, different seedling ages, Ning 84, Yongyou 538

摘要：

以宁84和甬优538为试验材料，研究了不同秧龄处理对机插连作晚稻秧苗素质、出叶情况、茎蘖动态及产量的影响。结果表明，随着秧龄的增加，秧苗素质明显变差，主茎叶数逐渐减少，株高变矮，穗长变短，产量降低。宁84和甬优538秧龄23 d、28 d的处理实际产量比秧龄18 d的处理分别降低0.86%、12.80%和2.67%、14.71%。随着秧龄的延长，2个品种的高峰苗数逐渐增加，宁84的成穗率随秧龄的延长而增加，甬优538的成穗率随秧龄的增加而降低。通过品种间的比较发现，相同秧龄条件下，宁84秧苗素质差于甬优538，但移栽后高峰苗数和成穗率高于甬优538。

关键词: 连作晚稻, 不同秧龄, 宁84, 甬优538