【摘要】 为探明除虫菊在育苗移栽条件下最佳种植密度,试验采用单因子随机区组设计,研究不同种植密度对产量、产值及构成因子的影响。结果表明,不同种植密度对单位面积除虫菊干花产量、干花产值、除虫菊素产量的影响均达到了极显著水平,并呈抛物线关系,且影响除虫菊干花产量和除虫菊素产量最大的因子均是单位面积的有效花梗数。试验也表明,单株有效花梗数、花朵数和无效花梗率、花蕾率与种植密度呈负相关关系,而单位面积有效花梗数和花朵数与种植密度呈Logistic函数关系。另外随着种植密度的增加,除虫菊生育期有所缩短,特别是封行期缩短最明显,但根腐病的发病率与种植密度呈正相关。综合产量、产值及生育期、发病率、株高等因素,云南省除虫菊适种区域以漂浮育苗移栽,种植密度6.0万～9.0万株/hm2时最适宜。更多还原

【Abstract】 Single factor randomized block design is used to study the effects of different planting densities on yield,output value,and yield component factors,thus to obtain the most optimum one under seedling transplanting condition.The results showed that the effects of planting densities on dried flower yield,unit output value,pyrethrin production reached extremely significant level in parabolic curve relationship.And the effective pedicel number was the most important factor affecting both dry flower and pyrethroid yield.The results also showed that the plant density was negatively correlated with the effective pedicel number,the flower number and the percentage of useless pedicel and bud per plant.However,there was a Logistic function relation between the planting density and the number of effective pedicels and flowers per unit area.In addition,the growth period of Pyrethrum cinerariifolium was shortened with the increase of planting density,while the morbidity of root rot was positively correlated with the increase of planting density.In considering the yield,output value,period of growth,morbidity and plant height,the best planting density is60000-90000 plants/hm2 under floating-seedling transplanting condition in P.cinerariifolium planting area of Yunnan.更多还原