Abstract:

Optimal phosphorus (P) management and ratio between basal and topdressing can not only increase root yield of Rehmannia glutinosa Libosch at harvest, improve its quality, but also increase famers income. Two years on-farm field experiments was conducted to summarize the characteristics of dry-matter accumulation and P demand, to study the influence of optimal total P fertilizer quantity and ratio between basal and topdressing fertilization on the growth and yield of Rehmannia glutinosa Libosch. Whatever dry-matter and P uptake, the accumulation peaks occurred from root elongate to root enlargement periods. Increasing the P fertilizer amount, especially P fertilization at root elongate phase, could significantly promote the roots/leaves ratio, and increase root yield at harvest. We understand that under present production conditions, the optimal P fertilizer amount is 72~88 kg P2O5/hm2, and the ration between basal and topdressing fertilization should be 1∶1 at root elongate phase.

Key words: Rehmannia glutinosa Libosch, phosphorus fertilization, application amount, ratio between basal and topdressing, dry-matter accumulation

摘要：

适宜的磷肥用量及基肥和追肥比例不仅可以提高地黄的产量，改善品质，还能增加药农的收入。通过两年的田间试验，总结地黄干物质积累及磷素需求特征，研究磷肥总量及基追比例对地黄生长和收获期产量的影响。结果表明无论是地黄总生物量还是磷素吸收量，积累高峰均出现在地黄拉线期至块根膨大期。增加磷肥施用量，特别是拉线期磷肥施用比例，能明显促进地黄根叶比，增加收获期产量。表明在当前生产条件下，地黄优化磷肥用量为72~88 kg P2O5/hm2，拉线期基肥和追肥比例应为1∶1,可提高产量。

关键词: 地黄;磷肥;施用量;基肥追肥比例;物质积累