Abstract
1. Experiments were carried out with large (16-18g) and small bulbs (1.7-2.0g) of William Pitt variety in a field of dune. The standard amounts of elements supplied to the plots were 26.3kg of nitrogen (Ammonium sulphate), 22.6kg of phosphorus (calcium super phosphate), 30.0kg of potassium (potassium sulphate), per 10a, and the test plots were set up by varing amounts one of the three elements: graded eleven degrees as from 0 to 37.5kg. Besides the eleven plots an unfertilized plot was added as control.
2. In general, the greater the amount of each element supplied, the higher the plant height, and with increased nitrogen fertilizer it was observed that their leaves became darker green. The flowering time had a tendency to be delayed with increasing the amount of nitrogen or potassium fertilizer, and to be hastened with increasing phosphate fertilizer. The increased rate of bulb weight and bulb number was most influenced by increasing the nitrogen supply, and less influenced by phosphate supply.
3. It was not difficult to find some relation between the number of split coat bulbs or the formation of droppers in the small bulbs, and the amount of each fertilizer supplied. The water content of bulbs tended to increase with increasing nitrogen or potassium and decreased with increasing phosphate.
4. It was also found that the differentiation of the flower bud occurred earlier in bulbs produced by supplying large amounts of nitrogen or phosphate, but the amount of potassium fertilizer seemed to have no effect on the flower bud differentiation. And, in the phosphate and the potassium plots, the relation between the earliness of flower bud differentiation and the smallness of water content of bulbs was recognized, but in nitrogen plots, it was hard to find such relation.
