Abstract

SummaryHand pollination, flower-shaking or tripping of the keel petals, was necessary to obtain adequate self-pollination of Spencer type sweet peas in glasshouses.The effect of low light intensities on fruit-setting was studied by growing plants under muslin of different weaves. During long days a small but significant increase in the fertility of a summer-flowering variety of sweet pea occurred on plants shaded by thin muslin, provided that high temperatures and minimal soil watering were maintained. The more intense the shading treatment, the greater was the amount of flower-bud abortion and this abortion was responsible for lower yields of fruits per plant. A significantly smaller number of flowers set fruit as a result of a heavy watering treatment that led to a slight waterlogging in the pots.By comparing the fruit-setting rate with temperatures which prevailed in a series of five-day periods in spring and summer, it was found that, for unit rises of temperature, the setting rate increased exponenti...

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