Field experiment was conducted to study the effects of shading 20 days before(L1) and after heading (L2), and no shading L0 as control, on yield formation of super japonica rice Nanjing 44 and Ningjing 3. The results showed that yield under the different light treatment was L1>L3>L2. Compared with L0, L1 reduced the leaf area index at heading, grain-leaf ratio and dry matter accumulation from jointing to maturity, increased the flag leaf SPAD value and net photosynthetic rate after full heading, then conducted to unfavorable-delayed senescence of 2 rice varieties. L2 mainly affected photosynthate accumulation from heading to maturity, and the effects on grain-leaf ratio and SPAD value were greater than L1. Compared with L0, L1 reduced the panicle length and light transmittance of top 3rd leaf, increased the plant height and leaf basal angle, vane angle, drooping degree of top three leaf at full heading.
WANG Ya-jiang, YAN Xi-ting, MENG Tian-yao, YANG Da-liu, WEI Hai-yan*, ZHANG Hong-cheng, DAI Qi-gen, HUO Zhong-yang, XU Ke
. Effects of Shading Before and After Heading on Yield Formation of Super Japonica Rice[J]. China Rice, 2014
, 20(5)
: 18
-21
.
DOI: 10.3969/j.issn.1006-8082.2014.05.004
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