The dose of 50% M1 lethal was around 16KR when planted in North, and 20KR when planted in Hainan.
北方种植M1的半致死剂量为16KR左右，海南岛种植M1时可加大剂量至20KR。
2
To observe the acute toxicity and death of the mice to which calcium nanoparticles were given in maximal dose and obtain the lethaldose50(LD50) or the maximal tolerance dose (MTD).