ABSTRACT:Yield performance related to the time required for re-blooming after cutting of three Rosa hybrida cultivars (First Red, Versilia, and Virginia) was evaluated both on their own roots and grafted onto three rootstocks (Rosa indica, Rosa canina, and Rosa hybrida cv. Natal Briar) in a plastic house experiment for two successive years (1999 and 2000). Regardless of rootstock type, the three cultivar-rootstock combinations were superior (p<0.05) to the own rooted plants for yield and re-blooming time required. Irrespective of the cultivar, Natal Briar rootstock exhibited significantly higher flower production and spent a shorter time to re-bloom compared to the other rootstocks (R. indica and R. canina) and the rooted cuttings. Although, the later two rootstocks, R. indica and R. canina performed similarly, they were significantly better than the own rooted plants with respect to yield and re-bloom time. It is concluded that rose cut flower production is negatively correlated with the time (days) taken from planting to re-blooming. The shorter the time required for re-blooming the higher the flower yield, especially on the Natal Briar rootstock.
ABSTRACT:The effect of three irrigation frequencies of treated saline water (salinity range 2.5-3.0 dS/m) was investigated on flower yield and quality of the First Red rose cultivar grown on three rootstocks (Rosa indica, Rosa canina, and Natal Briar) and three carnation cultivars Voyore, Diana, and Chad, in two planting media, soil and volcanic rock (tuff). Water regimes for soil experiments were irrigation to the field capacity (every two days, every three days and every four days). Tuff experiments were irrigated daily at 120%, 100%, and 80% of the evaporation readings.Significantly larger rose flower size, longer and thicker flower stems, higher number of nodes, longer internodes, and fewer blind shoots were produced by First Red rose cultivar when grown on Natal Briar rootstock combined with the three irrigation levels.The three carnation cultivars performed similarly in regard to flower yields when planted in both planting media. Generally, better flower and flower stem quality (larger flower size, length and diameter, longer and thicker flower stalk, higher number of nodes, longer internodes) were produced by the three cultivars grown in soil than in tuff using this saline water.It is recommended to grow these cut flower plants in soil rather than in tuff medium when this type of saline water is available for irrigation. However, more research is strongly recommended in the field of using low quality water for cut flower production.
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