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【简答题】
某市政公司承接了一项城市中心区的道路绿化工程，在宽20m的路测绿化带建植草坪及花境。现场内有1株，局部有杂草生长。栽植区土壤贫瘠，并有树根、石块、瓦片等。栽植前土壤样品经专业机构检测，有机质含量为1.5%，土壤PH值为7.0，通气孔隙度为12%。项目部组织编制的施工组织设计中，关于栽植前土壤准备、花境建植的施工方案拟定如下： （1）栽植前，在草坪和花卉栽植区内砍伐，深翻土壤达30cm，为提高土壤肥力，把杂草深翻入土。之后，清除树根、石块、瓦片等垃圾，再补充农田土，至松土层厚度不少于30cm。 （2）栽植时，按设计要求，并依株行距逐行栽植：为使植株稳定，花卉栽植深度比原苗圃栽植深5~10cm，栽后填土充分压实；然后用大水漫灌草坪和花境。 （3）施工验收在栽植过程中分阶段进行，包括：挖穴、换土、修剪、筑、浇水等。上级部门审批施工组织设计时，认为存在不妥之处，退回方案要求项目部修改。施工过程中，现场监理发现施工人员是施工企业临时招聘的，且缺少园林施工经验。施工现场时有行人穿越。 施工方案中栽植前的土壤准备工作缺少哪些步骤？
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