盆栽花卉由于受到花盆容积的限制,根部不能自由向下和向四周伸展,因而根系发育受到阻碍,如果管理不善,浇水、施肥等不当,就会比露地花卉容易出现黄叶。现将其发病原因及补救措施分述如下:(1)浇水过多。盆土长期过湿,造成土中缺氧,使部分须根腐烂,阻碍正常呼吸和水分养分的吸收,引起叶片变黄脱落。受害后先是嫩叶变成淡黄色,继而老叶也渐渐发黄。应立即控制浇水,暂停施肥,并经常松土,使土壤通气良好。 Potted flowers are limited by the volume of pots, and the roots can not freely extend downward and to the periphery. As a result, the development of the root system is hindered. If improper management, improper watering and fertilization, yellow leaves are more likely to appear than the flowers in the open field. Now the causes and remedies are as follows: (1) excessive watering. Pentu too long wet, resulting in soil oxygen, so that part of the root rot, hinder the normal breathing and absorption of water and nutrients, causing the leaves turn yellow. After the victim first leaves into light yellow, then the old leaves are gradually yellow. Water should be controlled immediately, fertilizer should be suspended, and often loosen so that the soil is well aerated.