行/株距比对超高产早稻产量和上部三叶的影响

于2011和2012年,采用再裂区设计,以超高产早稻中嘉早17和淦鑫203为材料,在31.20万蔸/hm2密度下,研究了行/株距比对不同品种产量和上部三叶形态特征的影响及二者的关系。结果表明,两品种施氮处理的产量均显著高于不施氮处理。淦鑫203的产量在不施氮时以RS/IS5.0(40.0 cm×8.0 cm)和RS/IS2.8(30.0 cm×10.7 cm)略高,在施氮时以RS/IS2.8和RS/IS2.0(25.0 cm×12.8 cm)显著高于RS/IS5.0和RS/IS1.3(20.0 cm×16.0 cm);而中嘉早17的产量在不施氮时以RS/IS2.0和RS/IS1.3显著高于RS/IS5.0和RS/IS2.8;在施氮时以RS/IS2.8、RS/IS2.0和RS/IS1.3显著高于RS/IS5.0。淦鑫203以RS/IS2.8和RS/IS2.0,中嘉早17以RS/IS2.0和RS/IS1.3有利于水稻高产和氮高效,而RS/IS5.0不利于水稻高产和氮高效。RS/IS对倒一叶的开张角和叶面积,倒二叶的基角,倒三叶的基角、叶长、叶宽和叶面积有显著或极显著影响。多元逐步回归分析表明,淦鑫203倒二叶的开张角、叶宽和倒三叶的叶面积与产量正相关,而中嘉早17倒二叶的基角、叶宽和倒三叶的开张角、叶宽与产量正相关。

Effects of Ratio of Row Spacing to Intrarow Spacing on Yield and Top Three Leaves of Super High-yielding Early and Late Rice

Using a split plot design, super high-yielding early rice ＆quot;Zhongjiazao 17＆quot;and ＆quot;Ganxin 203＆quot; and super high-yielding late rice ＆quot;Ganxin 688＆quot; and ＆quot;Wufengy-ouT025＆quot; were taken as materials with planting density the same at 312 000 hil s/hm2, to explore the effects of RS/IS （Ratio of row spacing to intrarow row spacing） on yield, top three leaves morphological features and its relationship of them in 2011 and 2012. The results showed that, whether early or late rice, biomass, accumula-tion and apparent utilizing rate of nitrogen were lower in RS/IS5.0 （40.0 cm ＆#215;8.0 cm） treatment, but yield of rice was higher in RS/IS2.0 （25.0 cm ＆#215;12.8 cm） treatment;grain numbers per spike of rice was more in RS/IS2.8 （30.0 cm＆#215;10.7 cm） treatment, and thousand-grain weight of rice was higher in RS/IS1.3 （20.0 cm＆#215;16.0 cm） treat-ment. For 4 varieties of early or late rice aforementioned, basal angle, opening an-gle and leaf area of 2nd leaf from top were larger in RS/IS5.0 treatment, and basal angle and opening angle were smal er in RS/IS2.0 treatment and leaf area smal er in RS/IS1.3 treatment.