第七卷_第560章 防治之法
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正说着，宫人来报杜如晦、房玄龄、长孙无忌来了！
李二把人宣进来，三人行礼完毕，见薛朗也在，略顿了顿，毫无一样之色，就杜如晦见到薛朗，上前一步，拱手行礼道：“如晦见过薛驸马，多日不见，驸马安好？”
杜如晦受过薛朗恩惠，见到他执礼乃是应当。不过，杜如晦已经不是过去那个一文不名的书生，如今也是朝廷一方重臣，薛朗自然不会坦然受礼，回了一礼，微笑道：“多谢问候，一切安好。”
之后便再无多余的话语。杜如晦也知这位驸马不擅交际的传闻，这会儿亲身体验了，感觉那是真深刻。
小李见状，不知怎的，心情好了许多，咳嗽一声，朗声道：“先前幼阳呈上来一份疏奏，兹事体大，便急诏你三人进来，且看完再议。”
说着，让内侍把薛朗的疏奏拿下去给三位大臣看。待三人看完，表情也凝重起来，薛朗少不得在旁边给科普一下蝗虫是什么东西，为什么会闹蝗灾一类的问题。
古人知道旱极而蝗，只是对蝗虫认识还不足，导致对蝗灾的认识存在不小的误区，还认为蝗虫是天谴，是鱼虾卵所化。又因为咱大中国自古以来都是以农为本的国家，蝗灾对农业伤害太大，上至天子，下至官员，无不谈蝗色变。
科学并不是万能，也并不足以解释一切，比如，薛朗的穿越……科学便无法解释。但是，蝗虫、蝗灾却能解释明白。
科普完蝗灾是怎么回事儿，又指着箩筐里的土讲解一番，完了坦然道：“这些土都是我在我与公主的庄子上，还有庄子附近的采挖的土壤。我朝辽阔，最近两年哪些地方有干旱的情况，陛下可使人快马加鞭去采挖些土块回来，也好对来年要爆发的蝗灾心里有个数！”
说完，又特意交代了一番，土大概要挖多深，挖什么地方的土才能挖到藏在土里的蝗虫卵等等。李二让人记了下来，待说完，薛朗道：“没有别的疑问了吧？如果没有，那臣便告退了！”
杜如晦三人眼神诡异的对望一眼，长孙无忌这圆脸哥哥朝薛朗拱拱手，道：“薛驸马请了，关于防治的问题，只需鸡鸭便成？非是无忌怀疑，只是事关重大，忍不住想再次求证一番。”
防治的办法薛朗在疏奏里写的很清楚，不过，受限于篇幅，没有写原理。考虑到古人们对蝗虫的知之甚少，薛朗想了想，干脆深入浅出的解释道：“以我朝目前的条件，我筛选之后，最适宜的方法就是两个，鸡鸭和诱捕！”
若是在现代，还可以用农用飞机喷洒农药等等手段措施，这在唐朝，薛朗也没那本事把农药调制出来，当然只能从生物链上考虑。
薛朗道：“蝗虫的习性，第一批蝗虫卵孵化应该是开春之后，三月到四月之间，被称作夏蝗，夏蝗还会繁殖一匹，叫做秋蝗，秋蝗产的卵越冬之后孵化出来就是夏蝗。所以，在防治上，压力最大的便是夏蝗，重点也是夏蝗。关中多种植麦，危害最大的也是夏蝗，只要把夏蝗防住了，秋蝗的危害不足为虑了！”
三个大臣连连点头，薛朗续道：“蝗虫也是虫，鸟吃虫这是人人皆知的自然规则。蝗虫年年都有，亘古以来便存在，为什么有些时候会变成蝗灾，有些时候不会呢？很简单，气候的影响不止影响到蝗虫，还影响到世间万物。蝗虫在自然界里天敌其实不少，鸟类、蛙类等都喜欢吃蝗虫，往日气候正常不干旱的时候，蝗虫产卵少，加之鸟类和蛙类的捕食，自然不会酿成灾难。气候干旱的时候，鸟类和蛙类……特别是蛙类首当其冲会受到影响，本来因为干旱蝗虫产卵就多，青蛙、蟾蜍这些因为干旱减少了，天敌几乎去了一半，与蝗虫的生存自然更加有利，长成的蝗虫自然也就更多，两两相加之下，蝗灾就形成了！所以，防治蝗灾，还需要从自然规则上入手，鸡鸭也是鸟类，也吃虫子，蝗虫的天敌减少了，我们便人工的增加蝗虫的天敌数目，以达成减少蝗虫数量的目的。种花家有人研究过，大概两千只鸡鸭便能治理一百余亩的蝗灾，所以，防治蝗灾，首选鸡鸭！”<();
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