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因光照造成花卉叶片发黄主要是管理不当,此种
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js1158com金沙,portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">叶子叶片发黄解决方法及原因叶片发黄原因有水黄-旱黄-光照-饥黄-肥黄花木叶片发黄,还受土壤酸碱度、病虫害、药害、烟尘、湿度高低变化的影响,土壤中微量元素比例失调,通风不良等因素也会造成叶片发黄。至于枝叶新陈代谢,移栽后营养水分暂时的失调,休眠期叶片凋谢,则是植物正常生理现象。花卉叶片失绿发黄往往是在莳养管理过程中对水、肥、光照掌握不佳造成的,症状和防治方法简述如下:portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">1.水黄portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">花卉顶部嫩叶呈浅黄萎蔫,老叶暗黄。萎蔫的叶片用手摘下,挫成团不烂,展开仍恢复原状。原因是积水久湿,土中缺氧,根开始腐烂。应停止浇水,多松土,让水分蒸发,在不伤根地前提下,掘出部分土壤,填入干燥的营养土或在盆中埋吸湿性强的物质,如吸湿纸、粉笔、海绵、棉纱,每隔4天更换1次。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">2.旱黄portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">花卉顶心的新叶夜色正常,而下部老叶片逐渐向上干黄,曲卷脱落。原因是长时间不浇透水,不松土,土壤板结,大量水分挥发,造成植物缺水,引起下部枝叶老化。其措施是放半阴处,稍浇些水,同时将盆壁烈隙疏松,以放水从缝隙流失。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">3.肥黄portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">新老叶肥厚光泽强,夜色墨绿,但叶背面皱缩凸起,叶片部舒展,老叶逐渐脱落,新叶严重时曲卷合闭,全株叶黄脱落,枝条突出楞翅。原因是施肥量过大过浓,应停水控制,并将花盆放在遮阴处,降低土壤湿度,可调节肥效的发挥。如果是施化肥造成,应及时倒盆换土,首先摘取全部叶片,重新定植后,浇水要适量,少量勤浇,放半阴处管理,待萌发新叶后,再转入正常莳养。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">4.饥黄portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">枝条细弱,叶薄嫩黄,无生长萌发力,长势要死不活。原因是植株大,盆小,多年没有更换花盆、换营养土,须根盘结过密而且老化。应及时施肥增加营养物质,有条件的浇液体腐熟肥水,促其恢复生长能力。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">5.光照portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">因光照造成花卉叶片发黄主要是管理不当。花卉有喜阳光、喜半阳光和耐荫之别,强光时枝叶枯黄、萎蔫、梢焦,如文竹等。但对三角梅、夹竹桃却相反。弱光枝条徒长、花小、叶片小而发黄脱落,如月季,但对龟背竹、虎尾兰等则适应。只要对花卉的生活习性充分了解,合理摆放花卉位置,及时调节光照、遮荫的时间,定会枝繁叶绿、花色艳丽。

portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">盆栽花卉的黄叶诊断及防治措施--盆花在生长期中,常常出现叶片变黄,究其原因,多数是由于栽培管理不当造成的。下面就介绍几种发黄的现象。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">1、水黄portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">盆土积水久湿,造成土壤缺氧,使部分根系腐烂,吸水、吸肥能力减弱。表现在嫩叶暗黄无光泽,新梢顶心萎缩,枝茎细小黄绿。发生此种情况应进行松土,控制浇水,停止施肥,重者可脱盆,置阴处吹干土球后再上盆。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">2、肥黄portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">由于施肥过多或浓度过大,尤其是偏施氮肥而引起的叶黄,表现为新叶肥厚而富有光泽,但叶面凹凸不舒展,老叶逐渐变黄而脱落。此时应停止施肥并适当增加浇水量以冲淡养分,盆花肥水不足或棵大盆小,盆内根系衰老或过密,也会使花卉植株的叶片变薄、变黄,此时应换盆换土,通常在雨水到立夏时进行。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">3、碱黄portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">盆栽喜酸性的花卉,如山茶花、米兰、含笑、杜鹃、茉莉等,常因土壤趋碱性反应而引起失绿黄化。表现在始于枝梢新叶的脉间,而叶脉,尤其是主脉仍保持绿色,黄绿相间现象十分明显。随着黄化程度的加重,叶脉逐渐失绿,继而全叶发白,叶缘焦枯,叶片凋落,严重时则枝梢枯顶,以至整株死亡。对于这种黄化现象,可采用施酸性肥料或酸性物质加以改良,或也可常施矾肥水。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">4、阴黄portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">喜欢阳光的花卉,常因室内光照不足致使枝叶枯黄,此时应将盆钵移至室外通风照光。对于半阴性花卉,诸如文竹,在强光下也会使叶片发黄,所以要避免夏季在高温强光下照射,应移入室内或搭建阴棚存放。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">5、旱黄portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">由于长期没浇水,或浇水偏少,出现叶片发黄或棕端、棕边,老叶自下而上的枯黄脱落。但新叶一般生长正常,此种现象发生时应补充水分,使土壤不再缺乏水分。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">6、灼黄portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">喜阴湿的盆花,如吊兰、万年青、玉簪等,如经强烈阳光直射,叶片也有棕端、棕边的现象。此种现象发生,将盆置阴处即可。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">7、湿热黄portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">一些不耐高温、高湿的盆花,因盛夏通风不良,遮阴不当而引起的黄叶,如吊钟海棠在夏季有此现象。所以高温高湿也容易引起叶子变黄,这种叶子变黄只要注意通风和降温,而且盆土也不能过湿即可预防。

portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">浇水过多盆土长期水大、湿涝使根部窒息而腐烂,不能正常吸收水肥,导致叶黄甚至脱落。发现有黄叶马上停浇水肥,疏松盆土放在通风干燥处,加快水分蒸发。浇水应坚持见干见湿,浇则浇透的原则,切勿零星浇水。此外花期切忌往花上喷水,并防暴雨袭击。缺水portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">花如缺水叶片下垂,应马上往叶片上喷水,以加快植物对水分的吸收,然后再往盆里浇水,此时注意少浇水让土壤湿润即可,切勿多浇水。施肥不当portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">在盆花生长期,长期不施肥或施肥不足等,会引起叶黄现象;施浓肥过多,花吸收不了把根烧伤,不能吸收水分同样会引起叶黄凋落,夏季每周施一次稀薄肥,切勿多施浓肥。若施肥过多,可多浇水稀释并冲去土壤中肥分。缺肥时可导致盆土板结,花叶黄、薄、瘦,枝条细长黄嫩。应立即施肥,一周内见效,可按期施肥,使花正常生长,开花多。温度过高portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">在夏季高温季节,性喜凉爽耐阴花卉在高温、光照强处,极易引起幼叶叶尖或叶子边缘枯焦,遇到这种情况需及时将之移到遮阴通风的地方,喷水降温,增加湿度有利花卉生长。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">碱大portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">由于盆花长期浇水,盆土内积累盐碱,严重时盆土上有碱壳使花叶脱落。方法是换新土或向叶面喷施硫酸亚铁水液中和,使用矾肥水与发酵淘米水,均能取得较好的结果,但切勿多施,如硫酸亚铁施肥过多,叶也黄,但不脱落,此时应适当浇碱性水来调节。空气干燥portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">在北方栽培的一些喜空气湿润环境的花卉。如茶花、兰花等,空气过分干燥往往会导致叶尖干枯,叶缘枯焦或叶片上发生焦斑。边缘卷曲起皱变棕褐色等症状。特别是冬季室内用煤火、暖气供暖地区发病较重,这时应当常用和室温相近的水喷洗枝叶,以增加空气湿度,家庭夏季在阳台养花可在阳台的地面上洒水,使局部环境湿润并兼有降温作用。花大盆小portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">由于花大根系多,需水肥多,小盆满足不了花生长需要,这时老叶常常干黄无光泽、嫩叶黄瘦,要换适当盆,土壤里要加30%腐殖土使花正常生长。枝叶过密portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">枝叶生长茂盛加上长期未经修剪,使内堂枝叶光照不足,出现叶黄脱落现象,应加强修剪使内堂通风,并适当施肥。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">光照不足portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">栽培性喜阳光花卉,如月季、石榴长期将其放置在光照过弱的地方,则会使植株逐渐衰弱,叶薄而黄,不开花或少开花。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">受寒portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">由于春季花出室早受风寒,或秋季寒冷,使花受冻害而黄叶,要入室保温和提前加强盆栽花卉抗寒锻炼。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">病虫危害portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">受到花叶病毒侵染后叶面上多现黄绿相嵌的斑块,受到真菌等病菌侵染而引起叶斑病,易使叶片局部坏死,应注意预防病害,及时喷药并给予充足的光照和通风。在夏季高温季节易产生虫害,要喷药预防,一般有蚜虫、红蜘蛛等,在叶背吸取营养和水分,使叶面枯黄甚至全株叶子萎黄脱落,及时灭虫可恢复。portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">其他portant; font: 14px/24px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(68,68,68); word-spacing: 0px; -webkit-text-stroke-width: 0px">花卉在受到大气中有毒气体毒害,或者气温高时突然浇冷水会造成生理干旱,喷高浓度农药防治病虫害时,均会引起叶尖或叶面局部焦枯,甚至全株死亡,因此要注意排除空气污染源,或栽植抗污染植物,合理使用农药,炎热夏天在上午10时前,下午4时后浇水为宜。

portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">分株玫槐的根部分蘖萌生力较强,愈分株生长愈旺,如果不分株,会使养分分,散而影响其正常发育,导致开花少或不开花。般分株宜在春季未荫动前或秋季落叶后。portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px"> 修剪玫瑰在生长期内不必修剪,一般应在冬季落叶休眠期进行修剪,留三分之一或二分之一的健壮枝,除掉老枝、枯枝、病枝和弱枝,促使其基部萌发新根。玫瑰花芽都着生于枝条顶端,因此,只能疏剪,不宜短截,每一株一般经46年即衰老,需进行更新。portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px"> 浇水玫瑰属浅根性树种,怕涝怕旱,雨季要注意排水防涝。夏季气温高,一般每隔7天左右浇水一次,但不能过量,否则会引起烂根。平时可酌量浇水,花期前后要增加一次透水。portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px"> 施肥地栽玫瑰,每年春季荫芽之前,要施一次腐熟的人粪尿或豆饼肥。萌芽后,每隔1520天施一次稀薄腐熟的蹄角骨质肥水,施肥后的次日浇一次清水。现蕾时施一次过磷酸钙或硝酸磷水溶液,可使花色泽艳丽。开花期间,停止使用氮肥,以防落花。入冬后在植株周围挖一个圆坑,施人牲畜粪或碎骨杂毛,覆土后,浇透水。portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px"> 光照玫瑰喜光照充足、地势高燥的环境,缺乏阳光照射便不易开花;忌靠白墙下栽植,白墙的日光反射,会灼伤叶片,对花芽形成也不利。portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px"> 温度扦插繁殖宜于在2025℃进行。高于35℃时发育不良,植株叶子易黄;零下20℃时,仍能安全越冬。portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px"> 摘花玫瑰5月初开花,小花品种系67月间开花。花朵一旦开足,香气就会散失,花瓣也极易脱落,故摘花宜在花朵初开、花瓣尚叠合未放、雄蕊还未显露时进行,具体时间是日出之前。实践证明,玫瑰摘花越多,开花次数也多,如不摘花,一年只能开花一次。portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px"> 病虫玫瑰常见虫害有介壳虫,可在春季用5度石灰硫磺合剂防治,发生红蜘蛛,可喷洒1000倍三硫磷或2000倍乐果防治;主要病害有白粉病,可用1%波尔多液喷施。portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">

本文由js1158com金沙发布于林业,转载请注明出处:因光照造成花卉叶片发黄主要是管理不当,此种

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