湘中丘陵区桔园杂草为害甚烈，发生逐年加重。笔者对其杂草种类及化学防除进行了调查、试验。１杂草种类于杂草盛发期对７个桔场近２６６７ｈｍ２桔园进行抽样调查。每个桔园按东、西、南、北、中５个方向各选一块土（约６６７ｍ２），每块土按跳跃式５点取样，每点取... Orange fields in the hilly area of ​​orange weeds very strong, increasing year by year. The author of its weed species and chemical control were investigated and tested. 1 Weed species Sampling survey of nearly 2667hm2 orange orchard in seven orange fields in weeds flourishing period. Each orange garden according to east, west, south, north, in the five directions of each election a piece of soil (about 66  7m2), each piece of soil by jumping 5:00 sampling, each point ...