摘要
为明确不同生育期的干物重对粤晶丝苗2号、粤农丝苗、合美占3个水稻(Oryza sativa L.)品种的产量及产量构成因素的影响,设置了早造和晚造两次不同氮肥梯度随机区组栽培试验。结果表明,叶片干物质的分配比例在拔节孕穗期时最高,且其随着生育进程逐渐降低,在乳熟期达到最低值;茎干物质的分配比例在乳熟期降至最低;齐穗期的穗干物质分配比例不到20%,而乳熟期的穗干物质量将近占总干物质量的43%;早造和晚造水稻的结实率差异极显著,总干重差异显著,而穗数、每穗粒数、千粒重、产量差异不显著;齐穗期以后,结实率和千粒重均与干物重呈负相关,而叶干重与穗数呈显著正相关,且相关性较大,茎干重与各产量性状密切相关,总干重与产量呈正相关。水稻干物重是决定高产的重要因素。
In order to explore the effect of dry weight on yield and yield components of three rice varieties （Yuejing Simiao No.2, Yuenong Simiao, Hemeizhan） at different growth stages, two experiments were carried out with different N levels for early-rice and late-rice. The results showed that the distribution ratio of leaf dry matter was highest at the jointing-booting stage, the ratio reduced gradually with the growth process and reached the lowest value at the milking stage; the distribution ratio of stem dry matter decreased to the lowest at the milking stage; the distribution ratio of panicle dry matter was less than 20% at the full panicle stage, and it increased about 43% at the milking stage. Between early-rice and late-rice, the difference of seed setting rate was extremely significant, and the difference of total dry weight was significant, and the differ-ence of number of panicle, number of spikelets per panicle, 1000-grain weight or yield was not significant. After the full panicle stage, seed setting rate and 1000-grain weight were both negatively related to the dry weight, leaf dry weight was closely and positively related to number of panicle, stem dry weight was closely related to the yield traits, and total dry weight was positively related to the yield. Dry weight of rice was an important factor to determine the high yield.
出处
《湖北农业科学》
2017年第7期1221-1227,共7页
Hubei Agricultural Sciences
基金
公益性行业(农业)科研专项(201303109-4)
广东省科技计划项目[粤科规划字(2013)137-2
2012B020317002]
校级大学生创新训练资助项目(KA154886816
KA154886803)
