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一、前言人们已经承认用幼苗的生理质量来评价其田间生产性能是合乎要求的。35年前,在一次讨论苗木生理质量的会议上,Wakeley 认为生理质量对幼苗生产性能是一个较稳定的指标.而形态上的分级就缺乏稳定性。Wakeley 也引用了形态分级和生理质量没有必要相同,也不必用成活和生长能力来鉴定的证据。虽然 Wakeley 的意见是在裸根苗生产条件下提出的,但也适用于容器苗生产。
I. INTRODUCTION It has been accepted that it is desirable to evaluate the field performance of young plants by their physiological quality. Thirty-five years ago, at a meeting to discuss the physiological quality of seedlings, Wakeley argued that the physiological quality is a more stable indicator of seedling productivity and the lack of stability of the morphological grade. Wakeley also cites evidence that morphological grading and physiologic quality are not necessarily the same, nor do they have to be characterized by viability and growth capacity. Although Wakeley’s advice is made under bare root shoot production conditions, it is also suitable for container seedling production.