Effect of Planting Density and Nitrogen on N Absorption,Utilization and Yield of Rice under Triangle System of Rice Intensification(TSRI)
【Abstract in Chinese】 以杂交水稻冈优725为材料,研究四川盆地西北部三维立体强化栽培不同栽培密度(行窝距)和施氮量对水稻产量、氮素吸收利用的影响,并探讨氮素积累、利用与产量间的关系。结果表明:各处理间水稻产量差异显著。抽穗期和成熟期水稻植株氮素总积累量与产量间呈极显著正相关。产量与土壤氮素依存率的相关性不显著(r=0.456),与氮素表观利用率的相关性也不显著(r=0.449),与氮素农学利用率的相关性达极显著水平(r=0.832**)。结合产量与水稻氮素吸收、利用状况及其之间的关系的表现,在本试验中,三维立体强化栽培的最佳栽培密度为45 cm×45 cm,施氮水平为150 kg.hm-2。此处理下,水稻产量极显著高于其他处理,植株氮素积累量最高,为129.9 kg.hm-2,穗中氮素积累量占植株总吸氮量的百分比最高,为72.51%。
【Abstract】 Hybrid rice combination Gangyou 725 was used to investigate the effect of different transplanting density and amount of N fertilizer on rice yield and N absorption and utilization under triangle system of rice intensification in the northwest of Sichuan Basin,and the relationship between yield and N absorption and utilization was studied.The results showed that the difference of rice yield between all models was significant.There were highly and significantly positive correlations between yield and N absorption at the heading stage and maturation stage.And there was no relathionship between yield and soil N dependent rate(r=0.456) and apparent N recovery efficiency(r=0.449),but there was highly significant correlation between yield and agronomic N use efficiency(r=0.832**).Combining rice yield and N absorption and utilization and its ralationship performance,transplanting density of 45 cm×45 cm and amount of N fertilizer,150 kg·hm-2 was the best model in this trial.In this model,the rice yield was the highest,and the amount of N uptaken by plant was 129.9 kg·hm-2,and it was the highest too.and the amount of N uptaken by grain accounted for the highest percentage of amount of N uptaken by plant, reaching to 72.51 %.
【Key words】 TSRI； Transplanting density； Amount of N fertilizer； Yield of rice； N absorption and utilization；
- 【Source】 西南农业学报 ,Southwest China Journal of Agricultural Sciences , Editorial E-mail ,2012(01)
- 【CLC code】S511