有效s
有效s
田间试验表明这一确定施硫量的方法是可行的,该方法比单纯用土壤速效硫含量确定的田间施硫量更合理。
Soil available s content increased gradually with increase in soil depth, whereas total s content decreased stepwise.随着土层加深,有效硫含量逐渐增加、全硫含量依次减少。
Once the public keys are available, encrypted (S/MIME) messages can be sent between the users.一旦获得了公开密钥,两个用户就可以相互发送加密(S/MIME)的消息。