Abstract
Duration of vegetative, generative, and grain-filling phases contribute to dry-matter accumulation and partitioning. Fourteen oat (Avena saliva L.) cultivars and six breeding lines were evaluated at the Viikki Experimental Farm, University of Helsinki, in 1988-1990. The following observations were made: (1) a short vegetative period accumulated less dry-matter into vegetative plant organs and resulted in higher grain yield and harvest index (HI), (2) a long period for maximum floret initiation yielded more grains per panicle and high panicle weight and (3) a short grain-filling period yielded high rates of panicle and grain filling associated with high HI. Hence, oat breeding and crop management should aim at improving the synchronization of the growth phases as shown in this study.
Highlights
A short growing season and the consequent demand for early maturing cultivars are the main factors limiting productivity of annual small grains grown in Finland
Weeds were controlled with MCPA [(4-chloro-2-methylphenoxy)acetic acid] at a rate of 700 g ha” 1 after the double-ridge stage, and bird cherry-oat aphids (Rhopalosiphum padi L.) twice in 1988 by alternating dimethoate and deltametrin at a rate of 400 g ha' 1 and 15 g ha 1 respectively. , Early double-ridge stage (DVS 3.4) (Peltonen-Sainio and Pekkala 1993), the developmental stage when floret abortion begins (DVS 14.9) and pollination (DVS 25.3) were recorded from 10 randomly sampled main shoots, and were considered to be reached when >60% of the plants were at that stage
The longer the growth period before heading, the higher was the grain yield, which resulted from increased weight of total phytomass and panicle (Table 1) associated with higher PGR
Summary
Growth duration and above-ground dry-matter partitioning in oats. (Department ofPlant Production, P.0.80x 27, FIN-00014 University of Helsinki, Finland.). Generative, and grain-filling phases contribute to dry-matter accumulation and partitioning. Fourteen oat (Avena saliva L.) cultivars and six breeding lines were evaluated at the Viikki Experimental Farm, University of Helsinki, in 1988-1990.The following observations were made: (1) a short vegetative period accumulated less dry-matter into vegetative plant organs and resulted in higher grain yield and harvest index (HI), (2) a long period for maximum floret initiation yielded more grains per panicle and high panicle weight and (3) a short grain-filling period yielded high rates of panicle and grain filling associated with high HI. Oat breeding and crop management should aim at improving the synchronization of the growth phases as shown in this study
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