Growth and Development of Uniculm and Conventional‐Tillering Barley Lines

Dofing, S. M.; Karlsson, Meriam G.

doi:10.2134/agronj1993.00021962008500010013x

Cited by 28 publications

(14 citation statements)

References 11 publications

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“…The lower of tiller number in present study was attributed to the failure in competition for nitrogen at lower level and aggravate death of the tillers due to mutual shading [35]. Another explanation is that, competition for assimilates exists between developing panicles and young tillers during the beginning of panicle development causing suppression of growth of many young tillers therefore they may senesce without producing panicle [36] [37]. Similar results were also reported by other authors [38] [39].…”

Section: Yield Components and Yieldsupporting

confidence: 86%

Growth, Yield and Nitrogen Use Efficiency of New Rice Variety under Variable Nitrogen Rates

Haque¹,

Haque²

2016

AJPS

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Section: Yield Components and Yieldsupporting

confidence: 86%

Growth, Yield and Nitrogen Use Efficiency of New Rice Variety under Variable Nitrogen Rates

Haque¹,

Haque²

2016

AJPS

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“…The importance of tillering as a selection index is still unresolved, especially under water-limited environments . Hadjichristodoulou (1985) advocated profuse tillering capacity, whereas others (Islam & Sedgley, 1981 ;Dofing & Karlsson, 1993) advocated `uniculm ideotypes' for water-limited environments . The present result and our previous results on growth rate and water use efficiency of the same cultivars clearly proved that cultivars with high tillering capacity show increased vegetative growth .…”

Section: Discussionmentioning

confidence: 99%

Ontogenetic analysis of yield components and yield stability of durum wheat in water-limited environments

Struik²,

et al. 1993

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One main reason for the slow improvement of durum wheat in water-limited environments is the lack of clear understanding of the interrelationships among yield components and their compensatory changes under low and erratic moisture availability. Five cultivars, varying in many physiological attributes, were tested under different drought-stress conditions in field and greenhouse experiments . The cause-effect relationships of duration of vegetative period, duration of grain-filling period, number of spikes per m 2, kernels per spike, kernel weight and grain yield per m 2 were assessed. Furthermore, yield stability was evaluated . Yield reduction was largest under mid-season stress (58%), followed by terminal stress (30%) and early stress (22%) . Cultivar Po was very sensitive to terminal stress .Path-coefficient analysis revealed a complex pattern of relationships among the six variables . An increase in vegetative period reduced the grain-filling period under all conditions . It increased number of kernels per spike under non-stress conditions . The direct effect of spikes per m 2 on grain yield was significantly positive . However, more spikes per m2 resulted in fewer kernels per spike and a low kernel weight and, as a result, a negative relationship with grain yield under early stress . Grain-filling period had a strong influence on grain yield via kernel weight. Kernels per spike had the largest direct effect on grain yield . However, it was negatively correlated with kernel weight, especially under terminal stress . Grain yield heavily depended on kernels per spike under early stress and grain-filling period and kernels per spike under terminal stress .Variation in drought susceptibility index among cultivars was significant under early and terminal stress conditions, but not under mid-stress conditions . Yield potential and stability were not correlated for the different drought-stress conditions .Longer grain-filling period, increased number of kernels per spike and limited spike number per m 2 can be used as selection criteria for sustainable yield in water-limited environments .

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“…In this study, a killing frost (daily minimum air temperature of -2.2˚C or lower) occurred during 7 of the 15 growing seasons (Table 1). In 1975In , 1980In , and 1989, frost occurred soon after sowing (within 10 days) and likely had little influence on plant growth, since the appearance of the first full leaf requires about 125 thermal units (or 12 days) in interior Alaska (Dofing and Karlsson, 1993;Sharratt, 1999). In 1974, frost had little impact on crop yield, as lethal temperatures occurred after ripening of barley and wheat but two days prior to ripening of oat.…”

Section: Yield-climate Analysismentioning

confidence: 99%

Climatic Impact on Small Grain Production in the Subarctic Region of the United States

Sharratt¹,

Knight²,

Wooding³

2003

ARCTIC

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ABSTRACT. The Subarctic comprises the higher mid-latitudinal regions with short, cool, moist summers and long, cold, dry winters. Indeed, the short, cool growing season is often thought of as a barrier to crop growth and diversity in these regions. Little is known, however, concerning the impact of the Subarctic climate on crop production. This study aimed to identify the climatic factors that are most important to the production of small grains in the Subarctic region of Alaska. The impact of climate on 'Galt' and 'Weal' barley (Hordeum vulgare L.), 'Nip' and 'Toral' oat (Avena sativa L.), and 'Gasser' and 'Park' wheat (Triticum aestivum L.) was assessed using climate and grain yield data collected from 1972 to 1989 at Fairbanks. Multiple regression analysis was used to identify the climatic factors that most influence yield. Different factors accounted for the largest proportion of variability in yield across years for the different grains. 1) For barley, variations in precipitation deficit (pan evaporation minus precipitation) and distribution of precipitation events within a growing season accounted for 41% of the variability across years in yield of Galt and Weal cultivars. 2) For oat, variations in the precipitation deficit ratio (ratio between precipitation deficit and pan evaporation) accounted for 44% of the variability across years in yield of Nip and 58% in yield of Toral oat. 3) For wheat, variations in number of days between precipitation events within a growing season, precipitation deficit, and temperature explained 70% of the variability across years in yield of Gasser and Park wheat. Results from our analysis further indicated that small grain production was bolstered in seasons with greater precipitation, more frequent precipitation, or lower evaporative demand (pan evaporation). Only wheat production appeared to be favored by higher minimum air temperatures. This study suggests that, despite the cool growing season in interior Alaska, the primary climatic limitation to crop production is water stress, associated with low precipitation or high evaporative demand. Therefore, land management practices aimed at conserving soil water will likely bolster crop production in the Subarctic.Key words: barley, oat, wheat, cereals, grain yield, Alaska, climate RÉSUMÉ. Le Subarctique comprend l'extrême nord des latitudes moyennes où les étés sont courts, frais et humides et les hivers longs, froids et secs. En fait, on pense souvent que la brièveté et la fraîcheur de la saison de croissance sont des obstacles au développement et à la diversité des cultures dans ces régions. En revanche, on sait très peu de choses sur l'impact qu'a le climat subarctique sur la production végétale. Cette étude vise à déterminer les facteurs climatiques les plus importants pour la production des petites céréales dans la zone subarctique de l'Alaska. On a mesuré l'incidence du climat sur l'orge (Hordeum vulgare L.) «Galt» et «Weal», l'avoine (Avena sativa L.) «Nip» et «Toral» et le blé (Triticum aestivum L.) «Gasser» et «Park»...

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Growth and Development of Uniculm and Conventional‐Tillering Barley Lines

Cited by 28 publications

References 11 publications

Growth, Yield and Nitrogen Use Efficiency of New Rice Variety under Variable Nitrogen Rates

Growth, Yield and Nitrogen Use Efficiency of New Rice Variety under Variable Nitrogen Rates

Ontogenetic analysis of yield components and yield stability of durum wheat in water-limited environments

Climatic Impact on Small Grain Production in the Subarctic Region of the United States

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