MISC

2002年

Response of growth and grain yield in paddy rice to cool water at different growth stages

Field Crops Research
  • Hiroyuki Shimono
  • ,
  • Toshihiro Hasegawa
  • ,
  • Kazuto Iwama

73
2-3
開始ページ
67
終了ページ
79
記述言語
英語
掲載種別
DOI
10.1016/S0378-4290(01)00184-8

Rice growing in cool climates and under flooding can be subjected to suboptimal water temperature (Tw) at any stage of the crop cycle. Although the response to Tw depends on the stage of crop growth, little is understood, in quantitative terms, about this stage-dependent growth response. We therefore conducted field trials for 3 years to determine the response of biomass and grain yield to Tw at three different stages: vegetative and reproductive growth periods, and early grain filling. Irrigated water was supplied so that, varying with year and developmental stage, there was a temperature difference from low to high of 4-7 °C with low (cool water) varying from 16 to 18 °C and high from 20 to 25 °C. The temperature treatments were applied for 20-34 days. We confirmed that grain yield was most severely reduced by low Tw (below 20 °C) during the reproductive period, as a result of low spikelet fertility. Low Tw during the vegetative period also reduced grain yield by as much as 20%. Although crop growth rate (CGR) was reduced by low Tw in all stages, the magnitude differed according to period, being greatest during the vegetative period, followed by the reproductive and early grain-filling periods. Reduced CGR before heading was associated largely with decreased canopy radiation interception and limited leaf area, whereas radiation use efficiency (RUE) was relatively unaffected by Tw. Decreased CGR after heading was associated with reduced RUE, although leaf area was also reduced by low Tw. The present results can be used to quantify rice growth and grain yield as affected by Tw. © 2002 Elsevier Science B.V. All rights reserved.

リンク情報
DOI
https://doi.org/10.1016/S0378-4290(01)00184-8

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