所谓合理的群体动态指标和苗相指标,就是根据品种本身的遗传特性和当地的生态条件。人为地创造一个各生育期既能使植株体内各器官间协调发展,又能经济有效的利用地力和光能的合理状态,并逐步把这一状态指标化,便于掌握,为田间管理提供依据。为比,它必须按照地力水平、产量高低、品种特性、生态条件等而定,不能千篇一律,一成不变。五十年代初期,曾大力提倡密植,对促进小麦由低产变中产,起到了积极的作用。六十年代,由于品种的逐步更换,土壤肥力和生产水平的不断提高,一些地方不适当地提出“越密 The so-called rational group dynamic indicators and seedling indicators, is based on the genetic characteristics of the species itself and the local ecological conditions. Artificially create a reasonable state that both plants can coordinate the development of various organs in the body and economically and efficiently use the geo-energy and light energy, and gradually standardize this state to facilitate grasp and provide the basis for field management. For the ratio, it must be in accordance with the level of fertility, yield level, variety characteristics, ecological conditions, etc. may not be stereotyped, immutable. In the early 1950s, it had vigorously promoted close planting and played a positive role in promoting the transformation of wheat from low-yield to medium-yield. In the 1960s, due to the gradual change of varieties, the continuous improvement of soil fertility and production levels, some places improperly proposed that "the more dense