Abstract:

A comparative experiment was carried out on pot-seedling and carpet-seedling mechanically transplanted under different sowing dates and transplanting dates of continuous cropping late rice in order to improve the production efficiency and yield of continuous cropping late rice. The results showed that, the quality of pot-seedling was better than that of carpet-seedlings under the same sowing conditions. Under the same sowing and planting period, compared with the carpet-seedling mechanically transplanted, the duration from sowing to heading of pot-seedling mechanically transplanted was shorter, the full heading period was advanced, but the whole growth period was basically the same. The yield of pot-seedling mechanically transplanted was significantly higher than that of carpet-seedling mechanically transplanted, with an average increase of about 150 kg/667 m². In the same way of seedling raising and transplanting, with the postponement of sowing dates and transplanting dates, the seed setting rate decreased, and the yield increased first and then decreased. The B2 treatment (seeding on July 2 and transplanting on July 30) had the highest yield, and the pot-seedlings mechanically transplanted could be planted later than the carpet-seedlings mechanically transplanted. According to the local production practice of Wenling County, the transplanting of continuous cropping late rice should be completed before the beginning of autumn in order to achieve high yield.

Key words: continuous cropping late rice, pot-seedling mechanically transplanted, carpet seedling mechanically transplanted, seedling quality, yield

摘要：

为提高水稻生产效率及连作晚稻单产，开展连作晚稻不同播栽期下钵苗摆栽及毯苗机插对比试验。结果表明，同期播种下钵苗秧苗素质要好于毯苗；相同播栽期下，与毯苗机插相比，钵苗摆栽的播齐历期缩短，齐穗期提前，但全生育期基本一致，钵苗摆栽的产量明显高于毯苗机插，平均增产150 kg/667 m²左右；同一育插秧方式下，随着播栽期的推迟，结实率降低，产量先增加后降低，均以B2处理（7月2日播种、7月30移栽）的产量最高，且钵苗摆栽要比毯苗机插耐迟播迟栽。结合温岭当地的生产实际，连作晚稻要高产，应在立秋前完成移栽。

关键词: 连作晚稻, 钵苗摆栽, 毯苗机插, 秧苗素质, 产量