Folia Horticulturae

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The effect of irrigation frequency and phosphorus nutrition on growth and flowering of New Guinea impatiens ‘Timor’ cultivated on ebb-and-flow benches

Joanna Nowak

Department of Floriculture
Research Institute of Pomology and Floriculture
Waryńskiego 14, 96-100 Skierniewice, Poland
e-mail: jnowak@insad.pl

The effect of watering frequency (at -0.5, -1.0, -5 kPa) and phosphorus nutrition (0.24, 0.90, 2.24 mmol dm-3) on the growth and flowering of New Guinea impatiens ‘Timor’ cultivated on ebb-and-flow benches was investigated. Irrigation at -0.5 kPa increased the fresh weight of plants, but did not affect their dry weight. Irrigation frequency at -5.0 kPa slightly decreased plant height and diameter and reduced shoot number. Watering frequency did not affect the flowering time of New Guinea impatiens. The plants cultivated at low irrigation frequency had fewer flower buds and flowers when grown under a higher P level than those grown at high irrigation frequency under the same P level. Low P level significantly reduced all plant growth parameters: fresh and dry weight, plant height and diameter, and shoot number. No effect of P level on the time of flowering was observed. Increasing P level of growing medium increased flower bud and flower numbers. Good quality, compact plants were obtained at an irrigation frequency maintaining water potential in the medium between -1.0 and -5.0 kPa and P level at 0.90 mmol dm-3.

Nowak J., 2002. The effect of irrigation frequency and phosphorus nutrition on growth and flowering of New Guinea impatiens ‘Timor’ cultivated on ebb-and-flow benches. Folia Horticulturae 14/2: 235-241.