Studies on carrot seed production: effects of plant density on yield and components of yield

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Abstract
Summary The yield of carrot seed (Chantenay types) increased by about 50%-55% with an increase in plant density from 10 to 80’plants m-2 in two experiments but in another there was no effect of density. The percentage of the yield contributed by the primary umbel was, on average, 25% and 62% for the low and high density crops, respectively. Increasing the plant density from 10 to 80 plants m-2 reduced the number of seeds per plant, largely because of fewer umbels, per plant. At anthesis, or soon after, seeds from primary umbels and low-density crops “were heavier, than those from secondary umbels and high-density crops. These differences were maintained throughout growth and, in . one year, were intensified by the shorter period of seed growth in the high-density crop. The lower mean seed weight in 1979 compared with 1980 was associated with a shorter period of seed growth and higher temperature after anthesis.

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