| In order to further clarify the optimal combination of irrigation frequency and potassium application amount for water saving,high yield and lodging resistance of wheat,a field experiment was conducted by two-factor randomized block design,with a winter wheat cultivar Gaoyou 2018 as material. The irrigation contains no irrigation,once irrigation at jointing,and twice at jointing and anthesis. The potassium application amount contains K2O at 0,75,150 and 225 kg·hm-2 levels,disignated as K0,K75,K150 and K225,respectively.Stem morphological characteristics and lodging resistance of wheat were determined. The results showed that,with the increase of irrigation frequency and potassium application amount,the height and gravity center of wheat plant,and the dry weight per centimeter,diameter,mechanical strength and lodging resistant index of the 1st and 2nd basal internodes of wheat stem were all increased significantly. The wall thickness of the 1st and 2nd basal internodes was significantly increased with the increase of potassium application. The grain yield and yield components were all increased with the increase of irrigation frequency and potassium application amount,but the difference of thousand grain weight was not significant among the four potassium application levels,and the differences of spike amounts per hm,grain amounts per spike and grain yield between K225 and K150 were not significant. Stem lodging resistance index was significantly positively correlated to dry weight per centimeter and diameter of the 1st and 2nd basal internodes,and significantly positively correlated to the height and gravity center of wheat plant. It was concluded that the combination of twice spring irrigation at jointing and anthesis,and K2O application of 150 kg·hm-2 was beneficial to achieve high yield and high use efficiency of potassium fertilization,which also improved lodging resistance of wheat stems. |
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