Abstract
In order to clarify the relationships between nitrogen nutrition and flower bud formation of three cultivars of Japanese pear, ‘Shinsui’, ‘Nijisseiki’ and ‘Hosui’ in sandculture, the effects of concentration and time of nitrogen supply(0-160ppm), when irrigated twice a week, were investigated.
1. The higher concentration of nitrogen tended to promote both tree growth and flower bud formation in all cultivars.
2. The higher concentration of nitrogen tended to increase the nitrogen content in each portion of the tree, although it decreased the carbohydrate content.
3. Nitrogen supplied from June to July tended to promote flower bud formation in all cultivars.
From these results it was found that flower bud formation in Japanese pear was preferably promoted by nitrogen nutrition.
