摘要
为探明双季稻区不同施氮水平和移栽密度条件下对水稻干物质积累及产量的影响,比较研究了早稻在N120. 0 kg/hm2+抛栽密度33. 0万蔸/hm2(E1M1)、N 150. 0 kg/hm2+抛栽密度30. 0万蔸/hm2(E2M2)、N 180. 0kg/hm2+抛栽密度27. 0万蔸/hm2(E3M3)、N 210. 0 kg/hm2+抛栽密度24. 0万蔸/hm2(E4M4),晚稻在N 150. 0kg/hm2+抛栽密度33. 0万蔸/hm2(L1M1)、N 180. 0 kg/hm2+抛栽密度30. 0万蔸/hm2(L2M2)、N 210. 0 kg/hm2+抛栽密度27. 0万蔸/hm2(L3M3)、N 240. 0 kg/hm2+抛栽密度24. 0万蔸/hm2(L4M4)等不同施氮量与密度条件下的干物质积累及产量。结果表明,早稻和晚稻的苗期至孕穗期,各处理植株叶面积指数大小顺序分别表现为E1M1> E2M2> E3M3> E4M4和L1M1> L2M2> L3M3> L4M4;成熟期,分别以E2M2和L2M2处理为最大。早稻和晚稻各个生育时期,各处理植株的根系、茎、叶、穗干重大小顺序分别表现为E4M4> E3M3> E2M2> E1M1和L4M4> L3M3> L2M2> L1M1。早稻产量以E2M2处理为最高,其大小顺序表现为E2M2> E3M3> E1M1> E4M4;晚稻产量以L2M2处理为最高,其大小顺序表现为L2M2> L1M1> L3M3> L4M4。因此,早稻在施N 150. 0 kg/hm2、抛栽密度30. 0万蔸/hm2,晚稻在施N 180. 0 kg/hm2、抛栽密度30. 0万蔸/hm2条件下,水稻植株干物质分配合理,有利于改善产量构成因素,获得较高的水稻产量。
To explore the characteristics of dry- matter accunmlation and grain yield of rice （ Olyza Sativa L. ） with different nitrogen application rate and transplanting density- in double - cropping rice system, the drymatter accumulation and distribution, grain yield of early rice and late rice by using different seedling -increase and nitrogen-reduction measures during the early and late rice growth season were analyzed. Four treatment combinations （4 N levels and 4 densities） were used in the early and late rice season experiments respectively. The results showed that the leaf area indexes of rice with different treatments were ElM1 〉 E2M2 〉 E3M3 〉 FAM4 and L1M1 〉 L2M2 〉 L3M3 〉 IAM4 at the main growth stages for the early and late rice respectively. The leaf area index with E2M2 and L2M2 were higher than that of the other treatments at mature stages of early rice and rice respectively. Meanwhile, the root, stem, leaf and panicle dryweights of rice plant with different treatments were FAM4 〉 E3M3 〉 E2M2 〉 ElM1 and IAM4 〉 L3M3 〉 L2M2 〉 L1M1 at the main growth stages of early rice and late rice, respectively. The grain yield of early rice with E2M2 treatment was higher than those of the other treatments, and the grain yield of early rice with different treatments was E2M2 〉 E3M3 〉 ElM1 〉 FAM4. The grain yield of late rice with L2M2 treatment was higher than those of the other treatments, and the grain yield of late rice with different treatments was L2M2 〉 L1 M1 〉 L3M3 〉 IAM4. Compared with the other treatments, the drymatter distribution in different part of rice plant with E2M2 and L2M2 treatments were more reasonable, and the grain yield and yield components of rice plant were improved.
作者
徐一兰
付爱斌
刘唐兴
李益锋
黄新杰
皮俊
XU Yilan;Fu Aibin;LIU Tangxing;LI Yifeng;HUANG Xinjie;PI Jun(College of Biological and Electromechanical Polytechnic,Changsha,Hunan 410127,China)
出处
《作物研究》
2018年第5期365-371,398,共8页
Crop Research
基金
湖南省自然科学基金(2017JJ3133
2017JJ1018)
湖南省教育科学"十三五"规划课题(XJK18CZY047)
关键词
双季稻
干物质积累
增苗
减氮
产量
double cropping rice
drymatter accumulation
seedling increase
nitrogen reduction
grain yield
