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科学施肥和土壤改良学习笔记(1)

  • 2026-02-06 13:37:38
科学施肥和土壤改良学习笔记(1)

第一章 大量元素肥

第一节 作物所需的营养元素

我们平时在施肥时,不管是施高氮肥、平衡肥、高钾肥,其实,我们都是想通过施用不同比例的氮磷钾,来调整农作物的生长状态,从而达到我们想要的效果。所以,我们想要做到科学施肥,我们就需要弄清楚,这些元素分别对作物有什么作用,你才能把肥料弄懂,才能达到少施肥也能让作物生长得好的效果,从而节省肥料成本。所以,   所以,我们在讲氮肥之前,我们需要先弄清楚,作物所需要的营养元素有哪些,这也为我们后面科学施肥打下基础。

目前我们普遍认为,作物的营养元素可分为:必需营养元素和有益营养元素,什么是必需营养元素,必需营养元素就是作物生长必须要用的,缺了其中一个,作物就不能正常生长,必需营养元素有17种,分别是大量元素,碳、氢、氧、氮、磷、钾,中量元素,钙、镁、硫,微量元素,硼、锌、铁、锰、钼、铜、氯、镍。那什么是有益营养元素,有益营养元素就是能够促进作物生长发育,但不是每个作物都必须要的,比如:钠、硅、钛、硒、矾、碘等,这几年,硅在大田作物上的应用是比较广泛的,使用量也是比较大的,这个我们也会在后面的课程里讲到。但是,对于我们种植户来讲,我们需要着重了解的还是必需营养元素。

我们上面也讲了,作物必需的营养元素共有17种,分别是:大量元素,碳、氢、氧、氮、磷、钾,这6种,由于碳氢氧,主要来源于空气中的二氧化碳和水,作物可以在空气中大量免费获取,我们不需要额外补充,大家也就没必要过多的了解,但是,氮磷钾,作物不能从空气中过多的获取,而且作物结果之后,果子也会把氮磷钾,包括下面的中微量元素都一起带走,所以,我们需要额外大量的补充。那对于中量元素就是,钙、镁、硫,这3种,微量元素就是,硼、锌、铁、锰、钼、铜、氯、镍这8种,其中,硼和锌是目前大部分作物在微量元素中需求量比较大的两种元素,镍元素基本不用补充,而氯元素比较特殊,除了大田作物,比如小麦、水稻、玉米等,对氯元素不敏感,我们大部分农作物是忌氯的,氯过量农作物品质反而下降,所以,大家可以去看一看,氯一般不会出现在水溶肥里(如果出现,氯含量也是极低的),同时,我们浇的农家肥和水里面本身就含有微量的氯,所以,我们作物本身是不缺氯的,还有一点要提醒大家,就目前而言,我们很多种植户,常年只施用大量元素氮磷钾肥料,对中微量元素从不在意,也很少补充,导致我们土壤里,中微量元素极度缺乏,就会出现很多问题。

举个例子,前几年,四川眉山的一家果园,之前种的碰柑,价格不好,农户在开春就高换成了爱媛,前期叶片生长正常,但夏梢开始就出现新叶黄化,老板以为是缺肥,,结果连续补充了2次高氮肥之后发现,肥也施了,钱也花了,结果叶片的黄化问题还是没有解决,于是咨询到我们,我们基本判断,叶片黄化主要是由缺锌、硼微量元素导致的,并不是缺氮磷钾,通过我们现场检测和沟通,确定了黄化原因,主要是多年未补充中微量元素导致不足,因此生长异常,我们给出了解决方案就是,每株树补了一两硫酸锌和半两硼砂,一个月后新叶就慢慢恢复了正常,所以,大家记住了,我们平时施肥不要只补氮磷钾,还要注重中微量元素的补充,才能做到科学施肥。而谈到科学施肥,就不得不讲到科学施肥的基础,木桶原理,那什么是木桶原理。

我们上面也讲了,大量元素、中量元素、微量元素都属于作物的必需营养元素,缺了其中一种,作物都不能正常生长,就好比这个木桶,大家可以看到,大量元素氮磷钾已经很多了,但是,微量元素锌却严重缺乏,所以,哪怕你补再多的氮磷钾,由于缺锌,作物的产量也是上不去的,这就是科学施肥的理论基础,木桶原理。所以,大家要记住了,作物的产量是由最短板的元素决定的,当我们的作物缺少任何一个元素后,想通过补充其他元素是无法提高产量的,只有做到缺什么补什么,才能做到真正的提高产量、降低成本,比如刚刚说的,作物明明缺锌,你补再多的氮磷钾也没用,浪费钱不说,还没有效果。所以,这些肥料知识,真的值得大家好好学习一下,能帮助大家更好的管理好作物,降低成本,科学施肥。讲完这些基础知识,我们就正式进入到下节的主题,氮肥的功能与作用。

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  1. CONNECT:[ UseTime:0.000724s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000848s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000690s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000275s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000639s ]
  6. SELECT * FROM `set` [ RunTime:0.000203s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000644s ]
  8. SELECT * FROM `article` WHERE `id` = 464430 LIMIT 1 [ RunTime:0.000433s ]
  9. UPDATE `article` SET `lasttime` = 1770357730 WHERE `id` = 464430 [ RunTime:0.004814s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000284s ]
  11. SELECT * FROM `article` WHERE `id` < 464430 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000549s ]
  12. SELECT * FROM `article` WHERE `id` > 464430 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000426s ]
  13. SELECT * FROM `article` WHERE `id` < 464430 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009013s ]
  14. SELECT * FROM `article` WHERE `id` < 464430 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001160s ]
  15. SELECT * FROM `article` WHERE `id` < 464430 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009377s ]
0.102062s