Decision support system is a new computer application field. It is developed up in the middle of 80s. C.T. Kitzmiller et al. firstly put forward the couple system in industry circle and integrated symbolic with numerical computing in expert System. In recent year, the couple system that made up of two technique is gradually accepted by researcher who working at agricultural expert system and called agricultural decision support system or expert system based on model. At present the most successful one is GOSSYM/COMAX system based on cotton simulation model. It has improved the performance and practicality of GOSSYM greatly. The MOCMDSS that developed by professor Liu Keli etc. (Inner Mongolia Agriculture University) is the expert system based on model on the basis of combinative experiment sited different place in many years. The system can provide comprehensive, precise, Fast guidance for maize high-yield and high-efficient cultivation management in main growing region, Furthermore, the economic benefit is prominent, It has the strong character of science, application, practical and universal. It is easy to transplant and expand. Therefore, it has brilliant application prospect for improving the level of maize management and production in our country.

本文对春小麦两个品种在不同密度、施肥量处理下群体源的形成与特性以及群体源在产量形成中的作用进行了系统的研究，结果表明：在合理的栽培技术措施下，采取适宜的密度与合理的配方施肥技术，建立合理的群体叶面积，将最大叶面积指数控制在适宜的范围内，尽可能长时间地保持绿叶面积，增强叶片光合能力，提高群体生长率，是扩大干物质（源）生产的主要途径。

本文对春小麦两个品种在不同密度、施肥量处理下群体库的形成与特性以及在产量形成中的作用进行了系统的研究，结果表明：春小麦籽粒体积（库容量）随生育进程呈单峰曲线变化，籽粒灌浆速率（库的充实）随生育进程呈S型曲线变化；每穗结实粒数（库）与开花期、乳熟期群体干物质源的供应呈显著正相关。籽粒体积与灌浆速率及粒重呈极显著正相关，由此说明扩大库容（籽粒体积），可以促进源的生产、运转与积累，提高籽粒重量。

本文对春小麦磷素的吸收积累分配和转移动态的系统研究表明：春小麦全生育期植株体内磷含量在分蘖末期最高为1%左右，此后随生育进程的推进逐渐下降，到完熟期降至一生中最低值，为0.3%左右。春小麦一生中磷素吸收呈单峰曲线变化， 峰值在拔节盛期至孕穗期，且因不同密度，施肥处理表现一定差异；高密度及高施磷处理吸收磷素较多，不施肥处理吸收最少。春小麦一生中，磷素的积累与生育进程间符合logistic方程。磷素在各器官中的分配在孕穗之前主要分配在叶片和茎鞘中，此后逐步向穗和籽粒中转移，到完熟时，籽粒中磷素含量占全株的60%～78%。