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                                            文章详情
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                                            化肥混用应注意哪些问题
                                            更新日期:2010-08-24 17:41:00点击量:

                                             根据多年来的试验研究和?#23548;?#25506;索,根据土壤特性?#22242;?#20316;物的需要,化肥进行科学的混合施用;不仅能提高肥料中养分的有效性,而且能改?#21697;?#26009;的理化性状,减轻农民的劳动强度,从而使作物实现真正意义上的高产高效。但是化肥混施应注意以下三个方面的问题:

                                              1.掌握混施的三条原则:混合后不能使其中任何一种养分降低;混合后不会产生任何不良的理化性状;养分种类?#22756;?#19968;定要适合作物的营养需求和土壤肥力状况。 
                                              2.要弄清楚哪些化肥能混施,哪些化肥不能混施,哪些化肥则只能暂时混合但不?#21496;?#32622;的。
                                              (1)可以混合的。除硝态氮肥外,几乎所有化肥都可以与有机肥混合施用。有机?#35270;?#21270;肥混施,能起到快慢结合、缓急相济、互补长短之功效,化肥可加速有机肥的腐熟分解,有机肥能活化化肥中难溶养分,提高肥料的利用?#30465;?#21478;外,有些肥料不但可以混用,而?#19968;?#29992;后效果较好。如硫酸铵、氯化铵等生理酸性氮?#35270;?#30967;矿粉等混合使用,能够提高磷的溶解度,增强?#24066;В?#33509;在石灰性土壤上使用,效果会更好。氯化钾与铵态氮肥混施,?#22756;?#23376;能抑制土壤的硝化作用,减少氮素损失。氯化钾与硝酸铵混合施用可降低潮解性,使物理性状变好。
                                              (2)不可混合的。有些肥料混合使用会使养分大量损失,造成很大浪费。如草木灰、石灰、炉渣磷肥等碱?#33489;?#26009;不能和腐熟的人粪尿、硫铵、硝铵、碳铵、氯化铵等铵态氮肥混合,否则,会引起化学反应,氧气挥发造成氮素损失和有效磷固定;草木灰、石?#19994;?#30897;?#33489;?#26009;也不宜和过磷酸钙、磷矿粉等混合,否则会使水溶性养分转化为难溶性养分,而降?#22303;?#32933;?#24066;А?#26377;机肥料不能和硝态氮肥混合,否则会发生反硝化作用造成氮素损失。还有硫铵不宜与碳铵、氨水、窑灰钾肥等混施;氨水不宜与尿素、氯化钾、磷矿粉混施;尿素不宜与钙镁磷?#30465;?#31377;灰钾肥混施,等等。
                                              (3)可以暂时混合但不能久置的。也就是说有些肥料虽能混合,但混合后必须立即施用。如硝态氮?#35270;?#36807;磷酸钙混合,肥料潮解吸湿,不便使用,若久置不施,中国黄金投资网氮素就会大大损失,而且有效磷转化为难溶性磷;尿素和氯化钾混合久置,养分虽没有损失,但?#19981;?#22686;加吸湿性,使肥料结块,给施用带来了困难。  
                                              3.关于叶面肥料及植物生长调节剂与其它肥料、农药的混合问题。一般来说,市面上的叶面肥料或植物生长调节剂多是酸性或中性,可与酸?#33489;?#26009;及酸性农药混用,但不宜和碱?#33489;?#26009;如石灰及碱性农药如波尔多液等混合施用。叶面肥料或植物生长调节剂与酸?#33489;?#26009;、酸性农药混合得?#20445;?#22914;叶面肥料或植物生长调节剂中添加氮、磷、钾、硼、锌肥等,不仅可以减少施肥?#38382;?#32780;?#19968;?#33021;互相增效,从而使肥药的效果发挥得更好一些。

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                                                                                      湖北快三

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