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影響邊坡綠化種子出苗率的五種因素影(ying)響邊坡綠化(hua)種子(zi)出苗率的五種因素: 二、忽視種子(zi)發芽(ya)適(shi)溫。干種子(zi)的(de)(de)發芽(ya)除(chu)有(you)一定(ding)水分(fen)條件外,還(huan)必須具備(bei)一定(ding)的(de)(de)適(shi)溫才(cai)行(xing)。(聯合邊坡綠化(hua))溫度(du)太(tai)(tai)高(gao)或太(tai)(tai)低都(dou)會(hui)影(ying)響出苗率(lv),甚至會(hui)引發種子(zi)的(de)(de)霉爛(lan)現象的(de)(de)發生(sheng),大(da)大(da)降低發芽(ya)率(lv)和(he)成苗率(lv)。 三、播(bo)種(zhong)(zhong)期不合(he)(he)理。顆粒大、外皮堅實或含有(you)油(you)質的種(zhong)(zhong)子適合(he)(he)在秋季播(bo)種(zhong)(zhong)。顆粒較小、外皮松薄的種(zhong)(zhong)子適合(he)(he)晚春播(bo)種(zhong)(zhong)。需高溫才能發芽的的種(zhong)(zhong)子,應(ying)在成熟后及時播(bo)種(zhong)(zhong)。 四、播(bo)種質量有問題。無論哪種方式(shi)均要求土壤疏松通氣、顆粒(li)細小、排水(shui)量好(hao),使用富含腐殖(zhi)質養(yang)料、酸(suan)堿(jian)適(shi)中的(de)肥土比(bi)較好(hao),有利(li)于種子(zi)出苗。播(bo)種深度一(yi)般為花卉籽粒(li)直(zhi)徑的(de)2.5倍為宜(yi)。 五、忽視光(guang)照(zhao)(zhao)的(de)影響。種(zhong)(zhong)(zhong)子(zi)播種(zhong)(zhong)(zhong)后,適當的(de)光(guang)照(zhao)(zhao)可增(zeng)加土(tu)壤的(de)溫度,誘發(fa)種(zhong)(zhong)(zhong)子(zi)發(fa)芽(ya),尤其(qi)對種(zhong)(zhong)(zhong)子(zi)沖(chong)破種(zhong)(zhong)(zhong)皮、出(chu)根露芽(ya)更為重要,這不(bu)但影響種(zhong)(zhong)(zhong)子(zi)的(de)出(chu)苗率,也直(zhi)接(jie)關系到(dao)能否長成好苗、壯苗。因此,從播種(zhong)(zhong)(zhong)到(dao)移苗階段,應盡量(liang)滿足花卉生長對光(guang)照(zhao)(zhao)的(de)需要,而且光(guang)照(zhao)(zhao)強度是一個從陰(yin)暗到(dao)弱光(guang)再到(dao)自然光(guang)照(zhao)(zhao)的(de)逐(zhu)漸過(guo)渡。 |