The effect of irrigation frequency and phosphorus nutrition on growth and flowering of New Guinea impatiens Timor cultivated on ebb-and-flow benches
2002
Nowak, J. (Research Institute of Pomology and Floriculture, Skierniewice (Poland))
The effect of watering frequency (at -0.5, -1.0, -5 kPa) and phosphorus nutrition (0.24, 0.90, 2.24 mmol/cubic dm) 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/cubic dm
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