关键词: 多因素响应面, 水肥配比, 株高, 穗粒数, 千粒重, 绵麦

Abstract: 【Objective】 The purpose of this study is to clarify the effects of different water and fertilizer ratios on plant height,grain number per spike and 1 000-grain weight of wheat,analyze the correlation between different growth traits,and seek the best combination of water and fertilizer.【Method】 The quadratic regression equation of wheat growth characters was established by the response surface optimization experiment of three factors and three levels using Mianmai 44 as material and multi-factor response surface analysis method.【Result】 Response surface analysis shows that the regression model is significant.Nitrogen application rate and irrigation amount are positively correlated with plant height,and the effect is very significant.Phosphorus application rate is positively correlated with the grain number per spike,and the effect is very significant.Nitrogen application rate and irrigation amount are positively correlated with 1 000-grain weight,and the effect is very significant.The correlation analysis of growth characters shows that plant height has a significant effect on 1 000-grain weight,but the grain number per spike has no significant effect on 1 000-grain weight.【Conclusion】 The optimum water and fertilizer treatments are 220 kg/hm² of nitrogen,87 kg/hm² of phosphorus and 60 mm of irrigation.The experimental results showed that the plant height is 87.48 cm,the grain number per spike is 37.6,and the 1 000-grain weight is 47.88 g.

Key words: multi-factor response surface, water and fertilizer ratios, plant height, grain number per spike, 1 000-grain weight, Mianmai