Pot culture experiments were conducted using two hybrid rice varieties with the method of shading to control the light intensity after heading. The effects of light intensity and nitrogen application and their interactive effect on the biomass production and grain yield of rice were investigated to explore the quantitative relation of interactive effect of post-anthesis light and nitrogen on rice. The result indicated that the effects of light intensity （X2, KJ/m2/d） and N application （X1,g/kg soil） on rice biomass and grain yield were mathematically represented by the following equation: Y=a0+a1X12+a2X1X2. A quadratic multinomial equation could be used to describe the correlation between N application and rice biomass. Moreover, a linear model could be used to describe the correlation between light intensity and biomass. The optimum N rate could be estimated by the light intensity after heading: Nopt = b0+b1X2. The optimum of N fertilizer was influenced lineally by light intensity or the average solar radiation per day during the treatment period, under the study condition.
WANG Qiang-1 2 3, ZHONG Xu-Hua-2*, HUANG Nong-Rong-2
. The Interactive Effects of Post-anthesis Light Intengity and Nitrogen Appication Interactive on Biomass Production and Grain Yield of Rice[J]. China Rice, 2015
, 21(4)
: 53
-55
.
DOI: 10.3969/j.issn.1006-8082.2015.04.010
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