Adatok az uborka asvanyi osszetetele, hozama es lisztharmat-ellenallosaga osszefuggesehez.
1990
Nagy Gy.Sz. | Kadar I.
In nutrient solution experiments, plants grown in a distilled water control or on 5-10 times the normal concentration of Hoagland solution gave low yields. The largest number of powdery mildew colonies was generally found in the case of a double concentration of standard Hoagland, where the plants were the tallest and had the highest yields and the greatest number of leaves. In N, P and K experiments the optimum concentrations were equivalent to 1.3-2.0 times the normal concentrations of Hoagland solution. The optimum concentrations of Ca and Mg were a tenth and a third, respectively, of those recommended in standard Hoagland solution. Judging by the mineral composition of 10-week-old cucumber plants, the optimum nutrient supplies in treatments giving the greatest shoot mass were: 2.5-3.5 N, 0.4-0.6 P, 3-5 K, 2-2.5 Ca, 0.5-0.8 Mg. Too high a concentration of standard Hoagland solution or an over-supply of N reduced both plant yields and the number of powdery mildew colonies. The better condition the host plant is in, the more susceptible it is likely to be to powdery mildew.
Afficher plus [+] Moins [-]Mots clés AGROVOC
Informations bibliographiques
Cette notice bibliographique a été fournie par Wolters Kluwer
Découvrez la collection de ce fournisseur de données dans AGRIS