单 位：
南京农业大学生命科学学院;江苏省农业科学院粮食作物研究所/江苏省优质水稻工程技术研究中心
关键词：
南粳49;栽插苗数;净光合速率;群体质量;干物质积累;产量
摘 要：
以南粳49为材料,研究栽插苗数对超级稻冠层和产量的影响。结果表明,南粳49对栽插苗数有较宽的适应范围,在2~4株·穴-1的栽插苗数内,南粳49均可达到较高的产量,而5株·穴-1则产量显著降低。不同的栽插苗数,南粳49有不同适应调节方式:2株·穴-1的植株,可通过增加单株分蘖数、每穗总粒数和提高单叶光合能力,从而增加干物质累积而获得高产;3株·穴-1的植株,则通过增加群体叶面积等提高群体数量的方式,增加有效穗数,而获得高产;在4株·穴-1的植株,则通过增加叶面积指数,以及减少倒2叶的叶基角以增加群体中层截光率,而改善群体质量,从而达到高产。可见,南粳49是具有较强群体调控能力的超高产水稻品种类型,选择2株·穴-1的栽插苗数,产量可以达到(12.63±0.253)t·hm-2,而且可以减少用种量。
译 名：
Effect of Seedling Planting Density on Canopy and Yield of Super-rice,Nanjing 49
作 者：
KE Xi-huan;LI Xia;ZHONG Wei-gong;FAN Fang-jun;QIAN Bao-yun;College of Life Science,Nanjing Agricultural University;Institute of Food crops;Jiangsu Academy of Agricultural Science,Jiangsu High Quality Rice R & D Center,Nanjing Branch of China National Center for Rice Improvement;
关键词：
Nanjing 49;;seedling planting;;Pn;;crop quality;;dry weight accumulation;;yield
摘 要：
Nanjing 49 was used in the experimentation to determine the effect of seedling planting density on the canopy and yield of the super-rice.The results showed that Nanjing 49's adaptability to the varying planting density was rather broad.It could reach a high yield at the range of 2-4plans·hill-1.However,when the planting density was more than 5plants·hill-1,the productivity significantly reduced.It appeared that Nanjing 49 adapted to the varied planting density by different means.For example,at the rate of 2plants·hill-1,it increased the total dry matters to reach a high yield by increasing its tillers per plant,total grains per spike,and photosynthetic capacity per leaf.At 3plants·hill-1,a high yield was achieved through increasing the total leaf area and effective panicles per hill.Then,when the planting was increased to 4plants·hill-1,it improved the yield by increasing LAI and reducing the leaf's base angle of the second leaves to effectively increase the sunlight reception.Therefore,with its high adaptability to the planting density,Nanjing 49 could provide a yield as high as(12.63±0.253)t·hm-2 on a reduced number of seedlings·hill-1(e.g.,2plants·hill-1)to save on the planting cost.
