推荐回答（2个）
建议不要浇水，因为膜上灌水缺点很多，主要体现在三个方面：
1、首先，膜上灌水不利于降低温室大棚内的空气湿度，因为在浇水后，有大量的灌溉水会残留在地膜上难以渗透到土壤中，致使大棚内空气湿度升高，容易诱发棚内作物大范围发生病害，影响作物产量。
2、其次，膜上灌水会降低土壤的通透性，由于灌水后大量水分在膜上淤积，会将地膜与
地表土壤粘连在一起，大大降低了土壤的通透性，致使植物根系呼吸受阻，吸收不到充足的氧气，影响作物根系的生长。
3、再次，膜上灌水会降低施肥效果，和灌溉水一样，肥料会残留在地膜上，在造成肥料浪费的同时，也会产生施肥不均的现象，影响作物的生长。
西瓜地膜覆盖后一般可比露地西瓜增产30%左右，所以通常它的施肥量要比露地西瓜相应增加20%-30%，增产幅度大的地块应再相应增施一定数量的追肥。在施肥时期上，与露地西瓜相比，应适当减少基肥比例和基肥中的氮素化肥施用量，但要相应增加追肥的次数和比例，基肥除施有机肥外，可以施用磷肥和少量复合肥而不宜施用尿素、碳铵等氮素化肥;追肥可比露地西瓜多施1-2次，也可喷施磷酸二氢钾或尿素溶液作根外追肥。第一次追施有机肥细肥可在地膜南侧开沟施用，以后的1-2次追施化肥可以随水追施，栽培后期也可破膜在株间穴施后再进行浇水。
地膜覆盖西瓜的灌溉技术应掌握浇透底水，苗期控水不浇，伸蔓期继续以控为主，过旱时在瓜沟畦内浇小水或只浇行间畦水，以使渗水浸入瓜根附近来控制水量，到了果实膨大期就可以全园漫灌，甚至连浇2水，也可破膜浇水直接增加根际水量来满足西瓜植株大量需水的要求。地膜覆盖最适于滴灌栽培。试验证明，地膜覆盖滴灌的防病增产效果非常显著，还可以大量节约用水，有条件的地方可大力推广使用。
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