Effects of moisture regimes on the flower abscission and the seed yield of lucerne
1991
Bystricka, A. | Ptackova, M. (Vyzkumny Ustav Picninarsky, Troubsko (CSFR))
It is generally expected that the seed yield of lucerne is affected in particular by the excess of precipitation during flowering and ripening. The trial has been aimed at studying how different moisture conditions and rapid changes at the stage of onset and full flower (considerad as critical from this viewpoint) affect the growing and generative development of lucerne. The problems were solved through a pot trial with seven moisture treatments (permanently moist with ground water, permanently moist, moist form the onset of flower, moist to the full flower, permanently dry, dry to the onset of flower, dry to the full flower). A number of indicators has been studied during the growing season (height and number of stems, dry matter of above-ground part and undergrowth, number of flowers, pods and traces after fallen flowers, percentage of falling, pure yield of seeds, percentage of dry seeds, TKW-thousand-kernel weight, transpiration coefficient referred to the seed). The results indicated that high moisture accompanied by warm conditions did not acted negatively, but positively influenced both the fodder and seed yield. Negative consequences of precipitation rather consist in the decrease temperature and sun light and limiting the activity of pollinators.
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