不同营养元素与玉米青枯病发病的相关性研究

Effects of different nutrition elements on maize stalk rot

玉米青枯病，又称茎腐病、茎基腐病，是世界玉米产区普遍发生的一种土传病害，国内外学者先后对病原菌种类、发病规律、病原菌接种技术与抗病性、防治措施等方面进行了研究。近年来该病在我国一些地区又有加重的趋势，严重地块发病率高达80％-90％，已对玉米的安全生产构成了严重威胁。

The effects of six kinds of fertilizer on maize stalk rot were studied in field condition. The results showed that potassium fertilizer greatly strengthened maize resistance to stalk rot, and the control effect was correlated positively with dosage. KH2PO4 and ZnSOa also showed obvious effects, which were 61.2% and 65.5%, respectively. The control effects of calcium magnesium phosphate fertilizer and farmyard manure were 25.2% and 34.5%, respectively. There was no difference between urea with normal dosage and no-fer- tilizer control. Furthermore, 1CP-AES was employed to detect the mineral elements variation between healthy and diseased maize. The results showed that eight of ten tested elements displayed lower content in diseased maize stem than that in healthy control and six elements in root were found lower than that of healthy maize.