บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Response surface models of the effect of nutrients and spacing on the keeping quality of potted roses.

Nielsen, B.; Starkey, K. R.;

Acta Horticulturae Year: 1998 Issue: No. 456 Pages: 215-221 Ref: 12 ref.

1998

บทคัดย่อ

Response surface models of the effect of nutrients and spacing on the keeping quality of potted roses.

The postharvest life of potted roses was analysed in a response surface experiment with 4 growth factors during production (ammonium and calcium concentration in the nutrient solution, addition of lime to the peat, and plant density). Data from the experiment were used for estimation of stochastic models and statistically significant growth parameters were identified. Increased calcium concentration in the nutrient solution during production increased the concentration of calcium in the buds and flowers in roses with low levels of ammonium (<27%). The number of wilted flowers until day 21 of the postharvest period was reduced by increasing calcium concentration. By adding more lime to the peat at low ammonium levels the number of wilted flowers and abscised yellow leaves decreased. At 5% ammonium, which was optimal for flower and leaf longevity in roses, the concentration of calcium in the plants was almost constant for all the ranges of lime.