Seven varieties of common buckwheat were tested in field experiments under two levels of nitrogen fertilisation (0 and 50 kg N ha-1) during the period 1998-2000. The objective of the experiments was to evaluate the influence of varieties, fertilisation andyear on the formation of yield components in common buckwheat and to evaluate the relationships between the individual components. As was observed, a compensatory ability exists among the particular yield components. An increase in stand density reduces branching and the number of inflorescences per plant. The number of flowers in the raceme is influenced by the mean day temperature during the period from flower bud formation to the beginning of flowering (r = -0.98, P < 0.01). Rainfall during flowering negatively influenced the number of achenes per plant. The high number of flowers reduced seed setting and negatively influenced the yield due to competition for assimilates. The high number of achenes per plant was linked to lower weight (r = -0.33, P < 0.05). The occurrence of empty achenes was a result of the susceptibility of the plants to the temperature conditions during the achene maturation period (r = 0.86, P < 0.05). The main yield component determining the yield was the number of fully developed achenes per plant.
Guan, I. M., Adachi, T. (1992): Reproductive deterioration in buckwheat (Fagopyrum esculentum) under summer conditions. Plant Breed., 109, 304-312.
'Reproductive deterioration in buckwheat (Fagopyrum esculentum) under summer conditions ' () 109 Plant Breed. : 304 -312 .
Hradecká, D. (1995): Potential and actual productivity of buckwheat. Plant Soil Envi., 41, 363-367.
'Potential and actual productivity of buckwheat ' () 41 Plant Soil Envi. : 363 -367 .
Jafimenko, D. J., Barabaš, G. I. (1990): Buckwheat. Agropromizdat, Moscow, 192 p.
Buckwheat , () 192 .
Jakimenko, A. F. (1982): Buckwheat. Kolos, Leningrad, 196 p.
Buckwheat , () 196 .
Kreft, I. (1989): Breeding of determinate buckwheat. Fagopyrum, 9, 57-60.
'Breeding of determinate buckwheat ' () 9 Fagopyrum : 57 -60 .
Kusiorska, K., Koszykowska, T. (1981): Nutlet settling and development in buckwheat under field conditions. Fagopyrum, 1, 7-8.
'Nutlet settling and development in buckwheat under field conditions ' () 1 Fagopyrum : 7 -8 .
Noworolnik, K. (1995): Nitrogen fertilization efficiency of buckwheat grown at various soil conditions. Curr. Adv. Buckwheat Res., 1, 601-604.
'Nitrogen fertilization efficiency of buckwheat grown at various soil conditions ' () 1 Curr. Adv. Buckwheat Res. : 601 -604 .
Petr, J., Hradecká, D. (1997): Basis of Millet and Buckwheat Growing. MZe CR, Praha, 32 p.
Basis of Millet and Buckwheat Growing , () 32 .
Ruszkowski, M. (1990): The phenomenon of dominance, competition, compensation and overcompensation in buckwheat productivity. Fagopyrum, 10, 5-6.
'The phenomenon of dominance, competition, compensation and overcompensation in buckwheat productivity ' () 10 Fagopyrum : 5 -6 .
Aufhammer, W., Esswein, H., Kübler, E. (1994): Development and utilization of the seed yield potential of buckwheat (Fagopyrum esculentum). Die Bodenkultur, 45, 37-47.
'Development and utilization of the seed yield potential of buckwheat (Fagopyrum esculentum) ' () 45 Die Bodenkultur : 37 -47 .
Aufhammer, W., Kübler, E. (1991): Productivity of buckwheat (Fagopyrum esculentum). Die Bodenkultur, 42, 31-42.
'Productivity of buckwheat (Fagopyrum esculentum) ' () 42 Die Bodenkultur : 31 -42 .
Edwardson, S. (1996): Buckwheat: pseudocereal and nutriceutical. pp. 195-207. In: Janick, J. (ed.), Progress in New Crops. ASHS Press, Alexandria, VA.
Progress in New Crops , () 195 -207 .
Adhikari, K. N. (1997): Determination of yield in common buckwheat (Fagopyrum esculentum Moench). Res. Rep. Biotechnic. Fac., Uni. Ljubljana, 69, 59-64.
'Determination of yield in common buckwheat (Fagopyrum esculentum Moench) ' () 69 Res. Rep. Biotechnic. Fac., Uni. Ljubljana : 59 -64 .
Sugarawa, K. (1956): On the sterility of buckwheat and their role with special reference to the accumulation of starch in the stem. Proc. Crop Sci. Soc. Japan, 28, 313-315.
'On the sterility of buckwheat and their role with special reference to the accumulation of starch in the stem ' () 28 Proc. Crop Sci. Soc. Japan : 313 -315 .
Zakarackas, R. (1999): Nitrogen fertilizer application to buckwheat. Agriculture, 66, 53-60.
'Nitrogen fertilizer application to buckwheat ' () 66 Agriculture : 53 -60 .
Alekseeva, E. S. (1986): The stabilisation of reproduction processes in the buckwheat varieties created by different methods. Fagopyrum, 6, 13-16.
'The stabilisation of reproduction processes in the buckwheat varieties created by different methods ' () 6 Fagopyrum : 13 -16 .