Chinese Journal OF Rice Science >
Effects of Wheat Straw Mulching and Nitrogen Management on Grain yield, Rice Quality and Nitrogen Utilization in Hybrid Rice Under Different Soil Fertility Conditions
Received date: 2014-03-04
Revised date: 2014-04-16
Online published: 2015-01-10
The effects of wheat straw mulching and nitrogen management on hybrid rice (F you 498) nitrogen (N) uptakes and utilization and grain yield and quality under high and low soil fertility conditions were evaluated. The experiment was conducted in paddy field at various soil fertility levels in the Rice Research Institute of Sichuan Agricultural University in 2013. A split-plot design was used at different soil fereility levels with wheat straw mulching as the main plot and no wheat straw mulching as control, and N-fertilizer management as sub-plots combined with N application level of 135 kg/hm2. The result indicated that the rice SPAD value of flag leaf at grain filling stage, nitrogen uptake and utilization efficiency were improved, as well as the grain yield and rice quality. Under high soil fertility, the rice N uptake and grain yield were higher than that under low soil fertility level,while the grain percentage of chalky kernel and chalkiness degree followed an opposite trend. The grain yield and the rice flag leaf SPAD during grain filling stage both increased under wheat straw mulching with the N application ratio of 3:3:4 for basal fertilizer, topdressing at tillering stage and at panicle initiation stage, as well as N uptakes and utilization efficiency and the grain quality. Furthermore, under low soil fertility level, the percentage of chalky kernel and chalkiness degree also decreased. The correlation between grain quality and SPAD of flag leaf during filling stage showed that under wheat straw mulching the rice flag leaf SPAD generally had significant or extremely significant positive correlation with the percentages of brown rice and head rice, and had negative correlation with the percentage of chalky kernel and chalkiness degree,and the correlation coefficients between flag leaf SPAD and grain quality maximized in the middle filling stage.
Key words： rice; nitrogen management; straw mulch; soil fertilizer condition; grain quality
Feng-jun YAN, Yong-jian SUN, Jun MA, Hui XU, Yue LI, Zou DAI, Zhi-yuan YANG . Effects of Wheat Straw Mulching and Nitrogen Management on Grain yield, Rice Quality and Nitrogen Utilization in Hybrid Rice Under Different Soil Fertility Conditions[J]. Chinese Journal OF Rice Science, 2015 , 29(1) : 56 -64 . DOI: 10.3969/j.issn.1001-7216.2015.01.007
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