EFFECT OF MECHANICAL STRESS ON CONDITIONING AND YIELD OF FOUR JAPANESE CULTIVARS OF CUCUMBER
Cucumber (Cucumis sativus L.) seedlings were brushed with a suspended bar for 1.5 min twice daily for 12 days (ST) prior to planting. One group of plants was brushed for an additional 10 days (LT) after planting. ST reduced stem length 12 to 28% and shoot dry weight 6 to 24% with `Kurume-ochiai-H' least responsive. ST reduced the numbers of female flowers on lateral shoots of `Ritsurin' and `Chikanari-suhyoh' while LT affected `Nanshin' and `Chikanari-suhyoh'. Brushing did not affect the total number of fruits or mean fruit size or weight of any cultivar, but both ST and LT decreased the total yield of `Ritsurin' grown in a plastic house. Brushing provides good growth control of containerized cucumber transplants with some responses differing among the cultivars. [Project funded by JSPS and Monbusho.]