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施肥和土壤改良学习笔记(7)

  • 2026-02-09 09:29:03
施肥和土壤改良学习笔记(7)

第三节 硫肥

1)硫肥的功能与作用

在作物体内,硫约占干物重0.1%~0.5%。根系吸收的硫几乎全部为硫酸根离子,另外还可吸收半胱氨酸,胱氨酸,甲硫氨酸等含硫氨基酸,植物叶片也可吸收和同化空气中的二氧化硫。

在作物体内硫有两种形态。一是无机硫酸根储存于液泡中。二是含硫氨基酸。如胱氨酸,半胱氨酸,蛋氨酸和谷胱甘肽等。根部吸收的硫酸根,主要通过硫酸根随水流向根表而被吸收,吸收过后会被还原成有机态硫化物,然后再与丝氨酸结合生成半胱氨酸,再进一步变成甲硫氨酸进入蛋白质。所以,硫最重要的功能就是,在作物体内构成含硫氨基酸和蛋白质,提升产量和品质。比如,像味道比较重的作物,葱、姜、蒜、辣椒等,适当的补点硫,能让它们更辣。而且不同的作物和器官之间的含硫量差别也很大,一般情况,十字花科作物的含硫量是大于豆科作物大于禾本科作物的,就植物器官而言,种子的含硫量是大于茎杆的。然后硫还有一个重要作用就是,能促进豆科作物形成根瘤,提高固氮效果,减少氮肥使用量。比如:茄科作物使用硫基平衡复合肥,要80斤每亩做底肥,而种大豆只需要40到50斤即可。因此,硫能调节植物代谢,提高产量和促进品质。

2)作物缺硫症状

其实,一般我们用的大量元素水溶肥,在制作过程中会加一点硫酸镁作为添加剂,或者我们用的复合肥,也经常都是硫酸钾的复合肥,所以,一般情况,作物不是很缺硫,不需要我们额外再补充。但是,我也带大家认识一下不同作物缺硫的症状。首先,缺硫的经典症状就是,先在幼叶或幼芽上开始黄化,叶脉先失绿,遍布全叶,严重时老叶发黄,甚至发白。茎细弱,根系细长,开花结果推迟,空壳率高,果少。

其次,豆科类和十字花科蔬菜是比较容易发生缺硫症状。

油菜缺硫:初始表现为植株浅绿色,幼叶色泽较老叶浅,以后叶片逐渐出现紫红色斑块,叶缘向上卷曲,开花结荚迟,花荚少小花色淡,根系短而稀。

桃树缺硫:新生叶失绿黄化,叶尖均匀发黄,严重时枯梢,果实小而畸形,色淡、皮厚、汁少。

玉米缺硫:植株矮化,幼叶失绿,叶丛发黄,成熟期延迟。 苗期缺硫时,新叶先黄化,随后茎和叶变红。

苹果缺硫:叶片长势变缓,叶片呈浅绿色或浅黄色。 叶片失绿黄化,近叶缘处最终形成坏死斑块。 缺硫症状始于幼叶。

 一般情况下,旱地作物是少有缺硫现象的,反而是水田,在缺氧的土壤环境中,施硫过多会引起作物非正常的生长和代谢,毒害作物根系,作物叶片出现暗红或是暗黄色,严重时会白色坏死的斑点。所以,水田不建议大量使用含硫复合肥,比如硫酸钾、硫酸铵等。

3)常见硫肥

硫肥主要有石膏、硫磺和含硫化肥。石膏分为生石膏,熟石膏和磷石膏三种。硫磺一般很少用,而含硫化肥一般有过磷酸钙,硫酸钾等。

4)硫肥使用方法

硫肥可做基肥、追肥和种肥。

做基肥时,可用石膏、过磷酸钙,石膏做基肥的用量为15~25公斤每亩,硫肥施用早比晚好,因为它是缓慢释放的。 

做根外追肥很少使用,做根外叶面追肥,可用硫酸镁,稀释1000倍喷施2-3次,间隔7天。

做种肥时,可用石膏或过磷酸钙,做种肥的用量为4~5公斤每亩。

在碱性土壤中使用石膏应根据土壤性质及灌溉条件来确定,在灌溉条件很差的地区,应在雨季前把石膏均匀撒在土面(石膏是酸性的),然后翻入土壤。因为石膏与土壤中交换性钠发生反应之后,钠盐可随雨排除,因为石膏与土壤中交换性钠发生反应之后,钠盐可随雨排除,达到脱碱的目的,从而改良盐碱土壤。

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  1. CONNECT:[ UseTime:0.000567s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000642s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000249s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001479s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000680s ]
  6. SELECT * FROM `set` [ RunTime:0.005755s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000806s ]
  8. SELECT * FROM `article` WHERE `id` = 465902 LIMIT 1 [ RunTime:0.008331s ]
  9. UPDATE `article` SET `lasttime` = 1770689335 WHERE `id` = 465902 [ RunTime:0.002056s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000282s ]
  11. SELECT * FROM `article` WHERE `id` < 465902 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000468s ]
  12. SELECT * FROM `article` WHERE `id` > 465902 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000339s ]
  13. SELECT * FROM `article` WHERE `id` < 465902 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002279s ]
  14. SELECT * FROM `article` WHERE `id` < 465902 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004408s ]
  15. SELECT * FROM `article` WHERE `id` < 465902 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001036s ]
0.101962s