不同产量水平玉米干物质积累态势研究

[目的]以玉米为研究对象,对不同产量水平玉米干物质积累规律进行全面、系统的研究。[方法]设计对照、平产处理和高产处理,其产量水平分别为7051、9681和11803kg/hm2。分别于8个生育期（苗期、拔节期、大喇叭口期、吐丝期、灌浆期、乳熟期、蜡熟期和成熟期）采样,用烘箱干燥法测定干物质积累量。[结果]不同产量水平玉米平均单株干物质积累量（Y）依出苗后各采样期的天数（X）的增长为不对称的S型曲线,可用Logistic方程Y=K/1＋e（a-bX）加以描述,可根据该方程求得其最大增长速率及其出现日期。在玉米各器官干物质积累方面,不同产量水平玉米叶片、茎秆干物质积累速度均呈现出前期慢、中期快、后期慢的积累规律;而籽粒干物质积累速度呈现不断增加的趋势。不同处理玉米的叶片、茎秆和籽粒干物质积累量均是高产处理〉平产处理〉不施肥处理。[结论]该研究为指导吉林省玉米的高产生产奠定理论基础和提供实践经验。

Dynamic Study on the Organism Yield Accumulation of Corn in Different Yield Treatments

[Objective]The research systematically studied dry weight change law of corn in different yield treatments.[Method]Three yield level treatments of 7 051,9 681 and 11 803 kg/hm2 were designed,including control,normal yield treatment and high yield treatment.The samples were collected at 8 growing stages,and their organism yield were determined by drying in oven.[Result]The results showed that the dry weight quantity (Y) of average every plant corn in different yield treatments on the basis of the days (X)of each sampling stage accorded to the equation of Logistic Y=K/1+e(a-bX),and the highest rate of increase and the day of emerge could be calculate from the equation.On the dry weight of corn each component aspect,the dry weight accumulative speed of leaf and stalkin in different yield treatments all showed the regular of earlier stage fast,midterm slow and later stage fast,but the dry weight accumulative speed of grain continuously raise.The dry weight quantity of leaf,stalk and grain in different yield treatments all showed high yield treatment > midterm yield treatment > non-fertilizer treatment.[Conclusion]The study can establish the theory basis of understanding the mechanism of Jilin Province corn high yield and offer some practice experience.