【摘要】 利用周期分析方法研究了小麦条锈病初侵染日期,流行盛期以及发生程度的内在规律,提取了周期项,证明了发生时间和发生程度间存在着密切的联系,利用周期项做延伸预报,经检验效果较好。更多还原

【Abstract】 The internal law for the first day of infect the time of popularity and the occurrence degree of wheat stripe rust have been studied by the cyclical - analysis. The cyclical unit have been derived. The close relation between occurrence time and degree have been proved. The extend forecast have been made by the cyclical unit. After test to obtain good results.更多还原