磷营养对天竺葵与彩叶草生长发育的影响

Phosphorus requirements of geranium and coleus during vegetative and reproduction growths

为确定天竺葵(Bullseye Scarlet)和彩叶草(Chocolate Scarlet)在温室生产中所需磷的最佳浓度,本试验通过调整霍格兰营养液中KH2PO4的浓度梯度(0、3、5、10、15、20和30 mg·L^-1)使磷元素浓度发生变化,并用其滴灌植物,进而探究磷营养对天竺葵与彩叶草生长发育的影响。结果表明,天竺葵和彩叶草在植物营养生长和生殖生长过程中,植物的生长参数以对数函数速率而增加;天竺葵和彩叶草的茎叶部分在营养生长时期对磷的需求量大于生殖生长时期;在不同的生长时期,磷元素对彩叶草生长的影响始终大于对天竺葵生长的影响;在营养生长期间,天竺葵生长的最适磷浓度为20 mg·L^-1,在生殖生长阶段,其生长最适磷浓度为15 mg·L^-1;在营养生长期间,彩叶草生长的最适磷浓度为15 mg·L^-1,在生殖生长阶段,其生长最适磷浓度为10 mg·L^-1。

In order to determine the optimal concentration of phosphorus required for the production of geranium(Bullseye Scarlet)and coleus(Chocolate Scarlet),this experiment adjusted the concentration gradient of KH2PO4 in Hogan’s nutrient solution(0,3,5,10,15,20 and 30 mg·L^-1)which changed the concentration of phosphorus,and used it to drip plants,then explored the effect of phosphorus nutrition on the growth and development of geranium and coleus.The results showed that during the vegetative growth and reproductive growth of geranium and coleus,the growth parameters of plants increased with the logarithmic function rate.The stem and leaf parts of geranium and coleus had higher phosphorus requirement during vegetative growth than reproductive growth.During the different growth period,the effect of phosphorus on the growth of coleus was always greater than that on the growth of geranium.During the vegetative growth,the optimum phosphorus concentration of geranium was 20 mg·L^-1.During the reproductive growth stage,the optimum phosphorus concentration for growth was 15 mg·L^-1.During the vegetative growth period,the optimum phosphorus concentration for the growth of coleus was 15 mg·L^-1.In the reproductive growth stage,the optimum phosphorus concentration for coleus growth was 10 mg·L^-1.