Effects of Different Degrees of Drought on Maize Growth and Yield in Jinzhou City

In order to explore effects of moderate and severe drought at jointing stage and heading stage on maize growth, development and yield in Jinzhou area, based on field experiment of main summer maize, five treatments of control group （CK） and drought stress group（T1, T2, T3 and T4） were set up, and each treatment was repeated for 4 times．Results showed that T2 was significantly shorter than CK, T1 was significantly shorter than CK, plant height was CK>T1>T2; plant height of T3 and T4 were also shorter than that of CK, but there was no significant difference, plant height was CK>T3> T4, but the effect was less than that of T1 and T2．Total number of leaves in T2 was significantly less than that in CK, and total number of leaves in T1 was significantly less than that in CK, total number of leaves was CK>T1>T2; total number of leaves in T3 and T4 were also significantly less than that in CK, and total number of leaves was CK>T3> T4．Ear length of T2, T3 and T4 were significantly lower than CK, and bald tip ratio was significantly higher than that of CK．There was no significant difference in ear diameter among five groups, 100 grain mass of T4 was significantly lower than CK, and panicle grain quality of T1, T2, T3 and T4 were significantly lower than CK．Theoretical grain yield of maize was significantly lower than that of CK．Maize suffered moderate and severe drought at jointing stage and tasseling stage, which had different degrees of inhibition and negative effects on plant height, total leaf number, ear traits and theoretical grain yield．Negative effect of drought on plant height and total leaf number of maize was greater at jointing stage, and negative effect of drought on ear traits and theoretical grain yield of maize was greater at heading stage．Influence degree of plant height, total leaf number, ear traits and theoretical grain yield of maize increased with the increase of drought intensity．The more serious the drought, the more serious the corn production reduction．