摘要
在海南三亚热带生态条件下,以超级杂交水稻组合两优培九和苗头组合两优0293、GD-1S/RB207为材料,设置5个不同施氮水平,即分别施纯氮0(N1,CK)、150(N2)、300(N3)、450(N4)、600(N5)kg/hm2,研究不同施氮水平对水稻产量及生长发育的影响.结果表明,两优培九和GD-1S/RB207在N3处理下的产量最高,两优0293在N4处理下的产量最高,但与N3处理下的产量相近.初步认为,在海南三亚生态条件下,超级杂交水稻的适宜总施氮水平为纯氮300kg/hm2,且氮肥(纯氮)用量每增加150kg/hm2,始穗期和齐穗期均相应推迟3～6d,最后全生育期延长3～6d.随着施氮水平的提高,伤流量增加,施氮量大于450kg/hm2后,随着施氮水平的进一步提高,伤流量不增反降.施纯氮0～450kg/hm2,随着施氮水平的提高,表层根所占体积比下降,中层根所占体积比上升,施纯氮450～600kg/hm2,随着施氮水平的提高,表层根所占体积比上升,中层根所占体积比下降.超级杂交稻两优培九和两优0293的剑叶张角随着施氮量的增加,表现出先增大后减小再增大的变化趋势;其剑叶表现出变长、变宽的趋势.
Under ecologically tropical conditions of breeding base Sanya in Hainan province, a combination of super hybrid rice Liangyoupeijiu and combination of symptoms Liangyou0293, GD-1S/RB207 were used as materials. Five different levels of nitrogen as 0（N1, CK）、 150（N2）, 300（N3）, 450（N4）, 600（N5） kg/hm2 were set up to study effect of different nitrogen fertilizer management on yield and growth. The results are as follows： Liangyoupeijiu in N3 had the highest yield, from the point of ecology and cultivation, in Sanya, Hainan, for super hybrid rice appropriate nitrogen application was 300 kg/hm2. With the increase of each additional 150 kg/hm2 （purity nitrogen）, early heading stage and heading stage were correspondingly delayed by 3-6 d, As a result, the whole growth period extended by 3-6 d. With the increase of nitrogen application, wound flow increased. Above the level of N4, with increase of application, wound flow declined rather than increased. With the increase of application within the range of 0-450 kg/hm2, volume ratio of surface roots declined, but that of middle roots went up. Within the range of 450-600 kg/hm2, with the increase of application, volume ratio of surface roots went up rather than go down, whlie volume ratio of middle roots went down rather than go up. With increase of nitrogen application, flag leaf of variety Liangyou peijiu and Liangyou 0293 tended to grow in both length and width, with its leaf agnle showing a up-down-up trend.
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第6期713-718,共6页
Journal of Hunan Agricultural University(Natural Sciences)
基金
国家"863"项目(2003AA212011)
关键词
超级杂交稻
施氮水平
根系
剑叶
产量
super hybrid rice
nitrogen fertilizer management
root
flag leat
production
