第21章 割稻
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徐平答应，叫过徐昌高大全和孙七郎来，让他们各自安排人手，把五台收割机抬进田里，其他的庄客分成几拨，分别打捆装车把稻捆运输回麦场。
一众人到了地头，三三两两分成一拨一拨围着稻田，纷纷品评着。
张君平看见稻田里满布浇水的渠和排水的深沟，眼睛一亮，对徐平道：“你这地里沟渠密布，有什么说法？”
徐平恭敬答道：“这里五百亩地，原先都斥卤遍地，只长芦荻荒草。开的水渠一是灌溉稻田，再一个是用清水洗卤，才好耕种。那些深沟，是用来把地下深处的卤水排走，不然清水洗过也是枉然。”
张君平连连点头：“小庄主是个行家！这些年来我治理河渠，深知卤水最难治理，你倒用三两句话就说得明白了。”
徐平忙道不敢。
张君平又问：“河北一带，多有人家引河水淤灌治理盐卤，称为淤田，成效也是显著。小庄主听说过没有？”
讲中国盐碱地治理，必讲黄河、海河及其支流的淤田，徐平怎么可能不知道？尤其是中国古代治理盐碱，规模最大成效最显著的就是王安石变法时引黄河汴河水淤灌，使开封一带遍布良田。这是当年历史课的重要考点，徐平多少还是记得一点的。但此时离王安石变法还久，甚至王安石这个人出没出生徐平都不知道，对淤田的效果却是拿不准。要知道盐碱地的治理，必须要与排水结合起来，不然都只能一时得利。实际上也正是得益于张君平和其继任者大力治理开封一带的内涝，开挖了排水沟渠，才给王安石淤田创造了条件。这个工作张君平此时刚刚着手一两年，效果还不明显，开封一带淤田还是不合适的。劳动人民又不是傻子，河北淤田早有成熟技术，如果可行，开封及其周围早就开始了。王安石只是把淤田的进程加速，也并不能无中生有。
想了一会，徐平才小心答道：“淤田技术我也有听说，无非两点，一是用清水洗去表层盐碱，再一个水退之后水中的新土盖在表面，形成良田。但斥卤进入地下，稍有时日，便会重新泛出。要想治本，还是必须要开挖深沟，把地下卤水排走，才能一劳永逸。”
张君平叹了口气：“正是如此！没有深沟排水，盐卤终究是不能除根。但开挖沟渠，又谈何容易！”
他此时正兼着开沟治理河道的差事，从开封府往东往南，有十多个州府都接朝廷命令配合他，要把开封府的水排到淮河流域。虽然动静很大，动用的民夫也是众多，但依然困难重重。
看徐昌带人已经进到地里，五头大黄牛拉着收割机已经准备妥当，徐平请示张君平：“提点，是否现在开始？”
张君平看着地里金黄色的稻浪，没说开始，却问徐平：“你估一估这地里的产量，每亩地能产多少新米？”
徐平道：“这不用估，前两天我已经带人算过了，平均亩产大约是两石三斗，比种麦要高一些。不过这是第一年种，再过两年等地养得熟了，还能增长。那时亩产应该到三石多到四石的样子，那就可观了。”
张君平奇道：“亩产也能算？怎么算？”
他到底没当过底层的亲民官，对于亩产估算不熟。当然此时估算亩产的方法也很简陋，不能与徐平前世比。郭咨就明白许多，听徐平讲过之后，已经在中牟推广新的估产方法，用作评地等级和判断丰年灾年的根据。因为此时只要农田遭灾，就可以上报要求免钱粮，到处虚报成风，这是个实用技术。
徐平便把自己前世估产的方法向张君平讲了一下。至于选地块，数苗数及仔细称量这些都没什么难理解的，就是得到数据之后进行误差分析超出了这个时代的知识，张君平半懂不懂，只是点了点头。
把这些讲完，张君平才放下自己的好奇心，对徐平道：“这便开始吧。”
徐平一声令下，地里的五头大黄牛一起向前走去，后面一片片的水稻便齐刷刷地倒在一边，比人用镰刀割快多了。
收割机的刀具已经被徐平替换成了往复式割刀，与前世的收割机也差不多，只是动力弱了，一次只能收割两行。但即使这样，作业速度也增加了很大一截，而且人也不费力，可以连续作业，算是农业技术的一个飞跃了。
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