Effect of variety and row spacing on stand structure and seed yield of amaranth
2002
Jamriska, P. (Vyskumny Ustav Rastlinnej Vyroby, Piestany (Slovak Republic))
In the field experiments, six varieties of two amaranth species - Amaranthus hypochondriacus (A.h. 1008, A.h. K-369 and hybrid A.h. K-343 cold Plainsman) and Amaranthus cruentus (A.c. 17, A.c. 29 and A.c. A-70) - were seeded into two row spacing (125 and 500 mm). Besides seed yield at harvest time the stand density, dry matter content in leaves and stems, height of inflorescence above ground, numbers of leaves on plant and that fell during vegetation period and portion plant organs on harvested dry matter were investigated. The highest yield granted variety A.h. K-343, the lowest variety A.h. K-369. The stands with narrower rows yielded more than with wider rows, on the narrowing of rows the most positive responded varieties A.h. K-343, A.c. 29 and A.h. 1008. Potential of the most productive variety and rows narrowing positive effect were realised especially in more favourable conditions. The stand density has been influenced by emergence conditions (year, varieties and row spacing). The highest dry matter content in leaves and stems had variety A.h. K-369, on the contrary the lowest dry matter content had variety A.h. 1008. The weather conditions of experiment years had significant influence, row spacing had no effect. Variety A.h. 1008 had inflorescence the highest above ground, on the contrary A.h. K-369 it had the lowest. The highest leaf count at time of harvest (21 leaves) were on the plants of variety A.c. A-70 and the least on the plants of A.h. K-343 (14 leaves). Until harvest or during vegetation period the most leaves (16 in average) fell from plants of A.h. K-343 and the least from the A.h. 1008 plants (nine leaves). On the harvested biomass dry matter participated in average inflorescences by 32.1%, then seeds 25.1%, stems 24.9% and the least leaves by 17.9%
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