Effects of pinching node positions on the growth and flowering of snapdragons (Antirrhinum majus L.)
2010
Inaba, Z., Shizuoka-ken. Research Inst. of Agriculture and Forestry, Higashiizu (Japan). Izu Agricultural Research Center | Kato, C. | Murakami, S. | Ishii, C. | Baba, F. | Horiuchi, M. | Ohtsuka, H.
Effects of pinching positions (just above the first, second, third and fourth node) on the growth and flowering of snapdragons (Antirrhinum majus L.), 'Maryland Pink' and 'Light Pink Butterfly II', were investigated. Seeds were sown in July and seedlings were raised without temporary planting. The main shoots were pinched at different node positions in September. The results were compared with those of the conventional cultivation with temporary planting. First flowering of lateral shoots in the third and fourth node pinching was earlier than in other pinching positions. The number of cut flowers was increased with upper pinching positions. The length of cut flowers in the primary lateral shoots from the fourth node was shorter than those from the other nodes. When cut flowers from the same node positions were compared, the length was shorter in 'Light Pink Butterfly II' than in 'Maryland Pink'. Although second node pinching is conducted in the conventional commercial cultivation of snapdragons in Japan, we suggested that upper node pinching might be suitable for higher productivity in the cultivation without temporary planting. Pinching at the first, second, third and fourth nodes without temporary planting all resulted in more cut flowers than second node pinching under conventional cultivation (with temporary planting). These findings showed that suitable positions for pinching the main stems were just above the second or third node for 'Maryland Pink', and the second node for 'Light Pink Butterfly II'.
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