论文部分内容阅读
一、前言杂草为害是造成黑龙江省水稻栽培面积缩减及单产降低的主要原因之一,也是稻作栽培中急待解决的问题。稻田杂草种类、分布和发生规律与气候、土壤以及栽培措施关系很大,只有针对当地杂草的群落组成采取适当措施才能收事半功倍之效。因此,明确不同地区杂草种类、分布、发生规律和固有防除方法具有极大实践意义。为此我们结合几年来的局部调查材料于1961—1963年杂草发生盛期进行了重点调查。先后调查了10余个县市,以田间实
I. Preface The weed damage is one of the main reasons for the decrease of rice cultivation area and the decrease of yield in Heilongjiang Province. It is also an urgent problem to be solved in rice cultivation. The type, distribution and occurrence of weeds in rice fields are closely related to the climate, soil and cultivation practices. Only appropriate measures can be taken to reduce the occurrence of weeds with respect to the weed community composition. Therefore, it is of great practical significance to clarify the weed species, distribution, occurrence and inherent control methods in different regions. To this end, we combined with several years of local survey materials weeds in 1961-1963 peak occurrence of a key survey. Has investigated more than 10 counties, field reality