杂交早稻旱育秧、水育秧和板田育秧方式秧苗素质比较

Comparative Study on the Physiological Characters of the Three Nursery Seedlings for the Early Hybrid Rice

比较南方稻区并存的旱育秧、板田育秧和水育秧3种主要育秧方式秧苗的形态、生理及抗逆性表明，旱育苗根系发达，生长健壮，活力高，吸收氮、磷、钾能力强；叶片宽大健挺，叶鞘粗短，分蘖到位率高；生理素质优良，干物质积累多，组织充实，碳、氮代谢协调，抗逆性加抗寒性、立苗能力和抗涝能力明显优于板田育秧和水育秧。

Compared three seedling-raising methods-the dry nursery seedling (DNS), the untilled paddy nurseryseedling (UPNS) and the paddy nursery seedling (PNS) both physiologically and morphologically the experimentresults indicated that the quality of DNS was supperior to that of UPN+PNS. The DNS had larger, stronger andmere active root sytem responsible for high rooting ability and high N, P and K uptake; the above -ground partwas also mere healthy for DNS. The leaves were wider, longer and mere vigourous, and their tillers grew baicallyconincident with sychronous growth of leaves. Apart from there, the phpsiological characters of DNS were betterthan those of the others, for instance, mere dry matter and mere harmenious rate of N, P and K uptake andmetabolism of carbon and nitrogen. The tolerance to adverse conditions like cold and water-logging was superior tothat of the UPNS+PNS, of course, the young UPNS vigor was better also. Otherwise, the paper discussed someaspects on the rang of three seeding-raising metnd.