推荐回答（4个）
稀释倍数÷500×农药体积=用水量（斤）农药稀释倍数其实是个简略的说法，省略掉很多字，以1500倍用药量为例，我把它延伸起出来，实际上是这样一句话：把1毫升农药稀释1500倍；毫升是体积单位，1500倍就是1500ml；需要加1500毫升的水；按照水的密度、体积、质量换算关系；1ml水的质量就是1g；那么1500ml水的质量就是1500g1斤=500g，1500÷500=3斤；也就是3斤水！换句话说，就是1ml农药，用3斤水稀释！
根据体积来看，假设有农药1升，加1升水则稀释1倍，依次类推。
若知道稀释前后的物质的量浓度（C）和密度（P），则可用公式{（1000*密度*浓度）/摩尔质量=物质的量浓度}来计算出液体浓度，根据浓度的比来算稀释倍数。
1.按有效成分计算：
（1）求稀释剂（水或填充料等）用量
①稀释100倍以下：稀释剂用量 =原药剂重量×（原药剂浓度-所配药剂浓度）/所配药剂浓度
②稀释100倍以上：稀释剂用量=原药剂重量×原药剂浓度/所配药剂浓度
（2）求用药量：原药剂用量= 所配药剂重量×所配药剂浓度/原药剂浓度
2.按倍数法计算（不考虑有效成分含量）：
（1）稀释100倍以下：稀释剂用量=原药剂重量×稀释倍数—原药剂重量
（2）稀释100倍以上：稀释剂用量=原药剂重量×稀释倍数
（3）求用药量：原药剂用量=所配药剂重量/稀释倍数
（4）求稀释倍数
①由浓度比求稀释倍数：稀释倍数= 原药剂浓度/所配药剂浓度
②由重量比求稀释倍数：稀释倍数= 所配药剂重量/原药剂重量
（1）农药有效成分量与商品量的换算：
农药有效成分量=农药商品用量×农药商品浓度（%）
例如，每公顷用敌杀死有效成分7.5克，则需2.5%敌杀死乳油300克。
（2）百万分浓度（毫克/千克）与百分浓度（%）换算：
百万分浓度（毫克/千克）=百分浓度×10000例如，40%乐果乳油折算成百万分浓度则是400000毫克/千克。
（3）稀释倍数换算
稀释倍数=稀释加水量/商品农药用量
加水稀释倍数=商品农药的有效成分含量/药液有效成分浓度
例一
用25%丙环唑乳油配制含有效成分为80毫克/升（即0.008%）的药液需用的加水稀释倍数是多少？
加水稀释倍数=25%/0.008%=0.25/0.00008=3125
例二
现有50%辛硫磷乳油60毫升需加水稀释配制成含有效成分为0.05%的药液，需用多少量的水来稀释？
加水稀释倍数=50%/0.05%=0.5/0.0005=1000
用水量=60×1000=60000毫升
例三1
5%三唑酮可湿性粉剂0.1千克用75千克水稀释后，问该药液中的有效成分浓度是多少？
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