THE EFFECTS OF CULTIVAR, TIME OF SOWING AND INTER-ROW SPACING ON CANKER AND YIELD OF PARSNIPS
The gross yields of Offenham were slightly greater than those of Avonresister in both seasons. Marketable yields of the two varieties were similar in the non-canker year, but in the canker years the marketable yields of Offenham were greatly reduced. Early sowing resulted in the highest gross yields and the most severe canker; it also gave the highest marketable yields of Avonresister in both years and of Offenham in the non-canker year. In the canker years, low marketable yields of Offenham resulted from all times of sowing. As inter-row spacing increased, canker increase in all years and gross yields decreased in 1967. In the other years, spacing had little effect on gross yields. The effects of spacing on marketable yields were variable except in the canker years when marketable yields of Offenham were greatest at narrow row spacings.