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 Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (11) Citing Articles via Google Scholar Google Scholar Articles by Asseng, S. Articles by Condon, A. G. Search for Related Content PubMed Articles by Asseng, S. Articles by Condon, A. G. Agricola Articles by Asseng, S. Articles by Condon, A. G. Related Collections Crop Growth and Development Dryland Cropping Systems Plant and Soil Interactions Wheat Crop Models Crop Genetics

Evaluating the Impact of a Trait for Increased Specific Leaf Area on Wheat Yields Using a Crop Simulation Model

^a CSIRO Plant Industry, Private Bag no. 5, Wembley, WA 6913, Australia
^b CSIRO Plant Industry, P.O. Box 1600, Canberra, ACT 2601, Australia

View larger version (18K): [in a new window]   Fig. 1. The specific leaf area (SLA) function in APSIM-Nwheat (_______) and with the modification applied to simulate an increased SLA trait (__ __ __ __) over three growth stages (1, emergence; 2, terminal spikelet; and 3, end of leaf growth).

View larger version (35K): [in a new window]   Fig. 2. Average monthly mean temperature (lines) and rainfall (bars) for (a) Moora (solid bars and _______), Wongan Hills (open bars and __ __ __ __), and Merredin (cross-hatched bars and __ .. __ .. __), Western Australia, based on weather records from 1907–1996; (b) Barellan (solid bars _______) and Pucawan (open bars and __ __ __ __), New South Wales, based on weather records from 1915–1992; and (c) Warra, Queensland, based on weather records from 1906–1995.

View larger version (26K): [in a new window]   Fig. 3. Simulated (a and b) daily leaf area index (LAI) and water stress and (c and d) aboveground biomass, grain yield, and N stress for (a and c) 30 kg N ha-1 and (b and d) 150 kg N ha-1 and (e) measured rainfall for Wongan Hills, Western Australia, on a sandy soil in 1968. Normal specific leaf area (SLA) is indicated by _______ and increased SLA by __ __ __ __.

View larger version (21K): [in a new window]   Fig. 4. Simulated cumulative probability distribution of the difference in grain yield between the increased specific leaf area (SLA) trait and the normal SLA trait on (a) a sandy soil and (b) a clay soil for 0 (_______), 60 (__ __ __ __), and 150 (___ . ___ . ___) kg N ha-1 treatments at Wongan Hills, Western Australia. The vertical line (...) represents zero.

View larger version (27K): [in a new window]   Fig. 5. Simulated grain yield response to the increased specific leaf area (SLA) trait over normal genotypes for 30 () and 90 () kg N ha-1 on clay soil at (a) Wongan Hills and (b) Merredin, Western Australia and measured yield response to early-vigor lines (BC2F2–derived lines of cultivar Amery crossed with a high-vigor donor line) for 1997–1999 with low (•) and high () N input and the high-vigor cultivar Westonia with high N input () (Botwright et al., 2002). Zero change grain yield line is also shown (...).

View larger version (31K): [in a new window]   Fig. 6. Simulated cumulative probability distribution of differences between the increased specific leaf area (SLA) and the normal SLA traits for (a, c, and e) maximum leaf area index (LAImax) and (b, d, and f) grain yield for (a and b) Moora, (c and d) Wongan Hills, and (e and f) Merredin, Western Australia, for 0 kg N ha-1 on a clay (_______) and a sandy soil (___ . ___ . ___) and 150 kg N ha-1 on a clay (__ __ __ __) and a sandy soil (___ .. ___ .. ___). The vertical line (...) represents zero.

View larger version (32K): [in a new window]   Fig. 7. Simulated relative change in long-term average yields with incorporation of an increased specific leaf area (SLA) trait for (a) sandy and (b) clay soil in Western Australia and (c) loamy soils in New South Wales (Barellan and Pucawan) and a clay loam in Queensland (Warra) for six N treatments. Vertical lines show the upper 25% probability of occurrence base on the long-term simulation runs as an indicator of variability. Long-term simulated average yields of the normal SLA genotypes are shown in Table 3.