Potential and actual productivity of common buckwheat
1995
Hradecka, D. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic))
The study was aimed at evaluating production yield capacities of buckwheat of the Pyra variety, approved in 1991. In addition to continuous weekly determinations of dry matter distribution and leaf area, average number of flowers per cluster and average number of clusters per plant were evaluated. Probable average number of all flowers per plant was determined as a product of number of flowers per cluster and number of clusters per plant. The calculation preceded series of methodological testing examinations of changes in number of leaves per cluster along vertical transection through the stand to provide good grounds for similar generalization. Correlation between number of clusters per plant and average daily temperature of air in the phase of development of buckwheat between 20 to 30 degrees (r=0.82) was confirmed. There is an intensive compensation between number of clusters per plant and number of flowers per cluster. In formative process an important role is played by sufficient amount of moisture and air temperature. After defoliating correlation between formation of fruits and average daily temperatures of air is negative (r=-0.91). Early sown stands set more short-pistillate flowers which are rather liable to reduction than long-pistillate flowers with shorter development. The ratio of flowers of both types is roughly 1:1 with slight deviations in particular years also with respect to the date and way of sowing.
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