佛山住商肥料有限公司含48卖多少元一包

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/etc/nginx/nginx.conf.住商肥料:摸清肥料套路 躲避购肥陷阱-化工
住商肥料:摸清肥料套路 躲避购肥陷阱
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发布时间: 16:18
&&&&如何辨别优劣复混肥 &&&&1.看:辨别优劣复混肥,首先要看肥料是不是双层包装,三证(生产许可证、肥料登记证、产品合格证)是否齐全有效;再看外包装袋上是否标明商标、号码、标准代号、养分总含量、生产企业的名称和地址;最后看肥料颗粒是否一致,是否有大的硬块或粉末。如配用加拿大钾肥的,可见红色细小钾肥颗粒。含氮量较高的复混肥,存放一段时间肥料表面可见许多附着的白色或无色的微细晶体。这种晶体是由于尿素和氯化钾吸湿后形成的,劣质复混肥没有这种现象。 &&&&2.摸:国家标准规定低浓度复混肥料的水分含量应小于或等于5%,如果水分含量超过这个指标,抓在手中的感觉一是粘手,二是可以捏成饼状,必然会使肥料颗粒抗压强度降低,失去复混肥料养分缓慢释放的性质。用手抓半把复混肥搓揉,手上留有一层灰白色粉末并有粘着感的为质量优良;若摸其颗粒,可见细小白色晶体的也表明为优质。劣质复混肥多为灰黑色粉末,无粘着感,颗粒内无白色晶体。
&&&&3.烧:取少量复混肥置于铁皮上,放在明火中烧灼,有氨臭味说明含有氮,透过蓝色钴玻璃,紫色火焰说明含有钾。且氨臭味越浓,紫色火焰焰色越重,表明氮、钾含量越高。
&&&&4.闻:复混肥料一般来说无异味(有机无机复混肥除外),如果具有异味,是由于基础原料氮肥主要用农用碳铵,或是基础原料中含有毒物质三氯乙醛(酸)的磷肥。三氯乙醛(酸)有毒物质进入农田后轻则引起烧苗,重则使农作物绝收,而且毒性残留期长,影响下季作物生长。因此,在选购肥料时最好不要买带有异味的复混肥。 &&&&5.溶:优质复混肥水溶性较好,绝大部分能溶解,即使有少量沉淀也较细小。而劣质复混肥难溶于水,残渣粗糙而坚硬。
&&&&6.尝:因市场上钾肥相对较缺,价格较高,有些不法厂商用红砖粉碎后充当钾肥。在购买时农民朋友可以尝一尝红色颗粒,氯化钾有咸味,而红砖颗粒则没有咸味。
&&&&怎么科学选用复合肥 &&&&1.按肥料性质 &&&&目前市场上销售复合肥料有相当部分不符合国家DB15063-94标准。国家标准规定复混肥(复合肥)有效养分含量:高浓度氮磷钾总量≥40%,低浓度氮磷钾含量≥25%,不包括微量元素和中量元素;所以选购复合肥时除了看商标和养分含量外还需注意厂家和产地。此外复合肥中的钾有两种一种为氯化钾另一种为硫酸钾。氯化钾含氯对氯敏感作物不宜施用。 &&&&2.按作物品种 &&&&葡萄、马铃薯、烟草等忌氯作物应选择硫酸钾型复合肥,而小麦、玉米、花生等对氯不敏感的作物可以选用含氯肥料;蔬菜尤其是果菜和根菜类及果树等经济作物需钾量较多,应适当的提高钾的施用量。 &&&&3.按土壤性状 &&&&对微碱性、有机质含量偏低(土壤ph值一般为8.0左右)、有效氮和磷缺乏的土壤一般应选用酸性复合肥如磷酸一铵或腐植酸类氮磷钾复合肥、氮磷复合肥为宜。但对少数红粘土或酸性棕壤土应选用碱性复合肥如磷酸二铵等。 &&&&4.按施肥方法 &&&&作基肥施用时必须选用颗粒状复合肥而且颗粒的硬度愈高愈好肥效最长,一般基施腐植酸类复合肥的效果优于追施肥。如作追肥施用则应选用溶解性好或者液态水溶肥,追肥根据作物需肥进行选择肥料,一般结果类及块根茎类作物膨果期或着色期要选择高钾类肥料。The page is temporarily unavailable
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