HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Shimono, H. Articles by Iwama, K. Search for Related Content PubMed Articles by Shimono, H. Articles by Iwama, K. Agricola Articles by Shimono, H. Articles by Iwama, K. Related Collections Rice Global Change Crop Models

Modeling the Effects of Water Temperature on Rice Growth and Yield under a Cool Climate

I. Model Development

^a Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Iwate, 020-8550, Japan
^b Department of Global Resources, National Institute for Agro-Environmental Sciences, 3-1-1 Kannondai, Tsukuba, 305-8604, Japan
^c Graduate School of Agriculture, Hokkaido University, N9, W9, Kita-ku, Sapporo, 060-8589, Japan

View larger version (26K): [in this window] [in a new window]   Fig. 1. Relationships between developmental rate (DVR) and air temperature and water temperature (Tw) from transplanting (TP) to panicle initiation (PI) and from PI to heading (HD) for ‘Kirara 397’ rice from 1997 to 1999. *** P < 0.001; * P < 0.05; ns, not significant.

View larger version (28K): [in this window] [in a new window]   Fig. 2. (a, b) Number of leaves on the main culm (LN) of rice grown under different water temperatures, and (c, d) relative tiller number (RTN, the ratio of the number of tillers to the initial number at transplanting) from 1997 to 1999. DAT, days after transplanting; DVI, developmental index; Tw, water temperature; HUt, heat units for tiller number (HUt = sum [Tw – 15]). *** P < 0.001; ** P < 0.01.

View larger version (15K): [in this window] [in a new window]   Fig. 3. Relationship between leaf area index (LAI) and total leaf number index (TLNI) of rice grown under different water temperatures during vegetative growth, and the relationship between LAI increase (LAI) and increase in the total leaf number index (TLNI) from panicle initiation for rice grown under different water temperature conditions during reproductive growth from 1997 to 1999. *** P < 0.001.

View larger version (18K): [in this window] [in a new window]   Fig. 4. Radiation use efficiency (RUE) as a function of the developmental index (DVI) of rice under different water temperature conditions from 1996 to 1999.

View larger version (25K): [in this window] [in a new window]   Fig. 5. Ratio of panicle dry weight to total weight (RPW) as a function of the developmental index (DVI) of rice during the grain-filling period from 1996 to 1999.

View larger version (26K): [in this window] [in a new window]   Fig. 6. Changes in ratio of leaf dry weight to total vegetative organ dry weight (leaf and leaf sheath plus culm dry weight) (LDW/VDW) as a function of the developmental index (DVI) of rice under different water temperature conditions from 1996 to 1999.

View larger version (13K): [in this window] [in a new window]   Fig. 7. Time courses of measured and estimated leaf area index (LAI) for rice grown under different water temperature conditions, with LAI data obtained from field experiments conducted at Sapporo, Japan, from 1996 to 1999. Symbols represent observed values, and lines represent estimated values. DAT, days after transplanting; RMSD, root-mean squared deviation; r, correlation coefficient between measured and estimated values. *** P < 0.001; ** P < 0.01.

View larger version (14K): [in this window] [in a new window]   Fig. 8. Time courses of measured and estimated radiation use efficiency (RUE) for rice grown under different water temperature conditions, with RUE values obtained from field experiments conducted at Sapporo, Japan, from 1996 to 1999. Symbols represent observed values, and lines represent estimated values. RMSD, root-mean squared deviation; r, correlation coefficient between measured and estimated values. ** P < 0.01; * P < 0.05; ns, not significant.

View larger version (19K): [in this window] [in a new window]   Fig. 9. Time courses of measured and estimated total dry weight (TDW), leaf dry weight (LDW), leaf sheath plus culm dry weight (SDW), and panicle dry weight (PDW) for rice grown under different water temperature conditions, with dry weights obtained from field experiments conducted at Sapporo, Japan, from 1996 to 1999. Symbols represent observed values, and lines represent estimated values. RMSD, root-mean squared deviation for TDW; r, correlation coefficient between measured and estimated values of TDW. *** P < 0.001; ** P < 0.01.

View larger version (19K): [in this window] [in a new window]   Fig. 10. Relationship between measured and estimated spikelet fertility and grain yield of rice under different water temperature conditions obtained from field experiment at Sapporo, Japan, in 1996–1999. Lines represent y = x, and the 10% intervals on either side of that line.** P < 0.01, * P < 0.05.