Interactive Effects of Light Intensity and Nitrogen Supply on Indicators of Main Growth Traits in Rice
Rainy weather in the seasons of rice growing often causes weak light stress.So it' s meaningful to study the interactive effects of light intensity and nitrogen supply.As a result,people can spread nitrogen fertilizer rationally according to the different light intensity.Under hydroponic pot conditions,with two Indica types and two Japonica types as experimental materials,two elements including light intensity (L0、L1 and L2) and nitrogen supply (N1 、N2 and N3 represent 7、21 and 35 mg · kg-1 respectively) were conducted in 2012 to study the interaction effects of light and nitrogen on the indicators of main growth traits in rice.The results showed that at the same growth stage and light intensity,values of the main growth traits increased with the concentration of nitrogen supply.At the same nitrogen level,tiller numbers of rice were shown as follows:Under the nitrogen level of 21、35 mg · kg-1,two Indica rice varieties were shown as L2 ＜ L0 ＜ L1,while two Japonica rice varieties were characterized by L2 ＜ L1 ＜ L0.At the stages of jointing,heading and maturity,the rice height and the value of leaf SPAD gradually increased with the light intensity weakening.Moreover,as the light intensity decreased gradually,leaf area decreased at elongation stage while increased at maturity stage.In this paper,by the effects of each single factor,such as light intensity,nitrogen levels and rice varieties,four growth traits had extremely significant differences among different varieties.Moreover,the effects of each single factor were significantly greater than those interaction effects.In this paper,it is demonstrated that when rice is in weak light stress,it will be unfavorable-delayed senescence,taller,higher values of leaf SPAD and leaf area.This phenomenon becomes more obvious with the increase of nitrogen level.
国家科技期刊平台
NSTL
万方数据
维普
