【摘要】 实地调查测定江苏中部机插淮稻7号、武育粳3号、镇稻9424和扬粳9538不同产量水平的典型田块的产量及其构成,对各品种的产量构成因素与产量作相关分析和通径分析,并计算各品种不同产量构成因素对产量的总决定程度。结果表明:前3个机插稻常用的半矮秆粳稻品种的穗数与产量的关系最密切,穗数对产量的总决定程度最高,可见穗数是影响机插稻产量提高的主要限制因子,机插稻栽培的主攻目标是确保足穗;高秆品种扬粳9538每穗粒数和结实率对产量的总决定程度较高,该品种在机插生产中已很少应用。更多还原

【Abstract】 An investigation of yield and yield components of machine-transplanted rice of four rice varieties,Huaidao 7,Wuyujing 3,Zhendao 9424 and Yangjing 9538,was carried out in the fields of mid-Jiangsu.The correlation and path analysis of yield and yield components of the four varieties were conducted.The total contribution of yield components to yield was calculated.The results revealed that the relationship between grain yield and panicle number of semi-dwarf varieties Huaidao 7,Wuyujing 3 and Zhendao 9424 was the closest,and the total contribution of panicle number to grain yield was the highest,which indicated that panicle number was the major limiting factor for yield of machine-transplanted rice.The total contribution of spikelet number per panicle,and seed-setting rate to grain yield of long-stalked variety Yangjing 9538 were both higher than others,however Yangjing 9538 is rarely applied in machine-transplaned rice production.更多还原