杂交水稻旱育秧本田高产栽培数学模型的初步分析

A Preliminary Analysis on High-yielding Cultural Mathematical Models for Dryland Raised Seedlings in Hybrid Rice

采用二次回归正交设计方法，研究旱育秧本田高产栽培的移栽密度、施肥总量、基追肥比例及适宜的搁田期，获得了江苏省里下河地区单产１０．１３ｔ／ｈｍ２以上的密、肥、水的技术方案：移栽密度为１７．１～３１．１万穴／ｈｍ２，施氮总量２１４．９５～３０５．３３ｋｇ／ｈｍ２，基追肥比例５６．１１∶４３．８９～８６．５７∶１３．４３，适宜的搁田期６９．１４％～１２２．８４％。

The factors of transplanting density, total amount of applied nitrogen fertilizers, ratio of base to dressing fertilizers and time for drying field were studied through quadratic regression design by using table of orthogonal arrays to optimize the agronomic practices in the high-yielding cultivation of dryland raised seedlings in hybrid rice. The results indicated that to obtain a yield of 10.13 t/hm 2 or higher, the technical practices could be transplanting density at 171 000～311 000 hills/hm 2, total amount of nitrogen fertilizer at 214.95～305.33 kg/hm 2, base/dressing fertilizer ratio at 56.11∶43.89～86.57∶13.43 and time for drying field at 69.14%～122.84%, i.e, the percentage of the number of tillers to the expected number of effective panicles.