关键词: 水稻, 稀落谷, 长秧龄, 秧苗素质, 栽插质量, 产量

Abstract:

A field experiment was carried out to compare the difference between long seedling age of thin sowing and conventional seedling age of regular sowing on seedling quality, transplanting quantity and yield of machine transplanted rice, using conventional japonica rice Suxiu 867 as material. The results showed that, compared with the conventional seedling age and regular sowing, the seedling quality of the long seedling age and thin sowing treatments（25 d, 30 d, 35 d） was improved, the rooting speed was fast after transplanting and the revival time was short. Under the condition of the same basic seedlings, the yield showed a trend of increasing first and then decreasing with the seedling age increase. Among them, the yield of 30 d seedling age with thin sowing treatment was the highest, followed by 35 d and 25 d seedling age with thin sowing treatment, 40 d seedling age with thin sowing treatment was the lowest. In general, the seedlings quality of 25~35 d seedling age with thin sowing was relatively good, and the yield was increased by 57.0~130.5 kg/hm2 compared to the control. The results indicated that this variety has greater elasticity of seedling age, proper prolongation of seedling age （30~35 d） is more favorable for obtaining high yield.

Key words: rice, thin sowing, long seedling age, seedling quality, transplanting quality, yield