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有效磷的含量是判断磷肥肥效的一个主要指标。但是,磷肥的有效磷究竟是多少,我们凭肉眼不能判别,买肥用肥的农民也没有专门的仪器去测定。这样,有效磷多少,只能靠包装袋上标示的数字去认定。这就给一些无良厂家提供了可乘之机:要提高一个有效磷很不容易,而印一个数字不花什么力气, 于是那些技术条件差的小厂就在包装袋上动起脑筋,把包装袋印刷得精美, 把有效磷的数字标得很高。因此,在欠购买磷肥时,面对各式各样的包装及其标示的数字,要有慧眼去加以识别。包装标签造假主要有三种花招:
The content of available phosphorus is a major indicator for determining phosphate fertilizer efficiency. However, what is the effective phosphorus content of phosphate fertilizers? We cannot judge with the naked eye. Farmers who buy fat fertilizers do not have special equipment to measure. In this way, the amount of available phosphorus can only be determined by the number marked on the packaging bag. This gave some unscrupulous manufacturers an opportunity: It is not easy to raise an effective phosphorus, and printing a figure does not take any effort, so those small factories with poor technical conditions will use their brains on the packaging bag. The bags are beautifully printed and the number of available phosphors is very high. Therefore, in the purchase of phosphate fertilizers, faced with a variety of packaging and labeling figures, there must be eye to identify. There are three main tricks for falsifying packaging labels: