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Effect of presowing treatment of seeds on the growth of Eucalyptus gunnii Hook. seedlings

Zbigniew Koziara

Department of Ornamental Plants
Faculty of Horticulture, Agricultural University
29 Listopada 54, 31-425 Cracow, Poland

The presowing conditioning of seeds included stratification, the treatment with GA3 solutions, drip-washing, and drenching under a shallow or deep water layer. The stratification and drip-washing resulted in the better developed root system compared with the above-ground part of plants. In this case the height of plant tops and the number of leaves were smaller than in the control plants.

The effect of GA3 at the doses of 200 and 600 mg dm-3 was manifested by a 15% decrease in the development of the root system compared with the control plants. With respect to the plant tops GA3, especially at the lower dose, distinctly stimulated the height and the number of leaves. After 80 days these parameters were by 15% higher than in the control.

After the initial 40-day period of growth no significant differences were found between the plants obtained from seeds subjected to shallow drenching and the control seedling. Distinct differences were manifested after 80 days of growth, especially in the case of seeds drenched for 4 days. The recorded values showed a 35% increase in the height of plants and a 23% increase in the number of leaves. Also the length of roots was increased by 15%.

Initially the deep drenching of seeds limited the length of roots, height of seedlings, and number of leaves. After the successive 40 days of growth the condition of plants improved and the plants tops reached the height of control plants. In the case of seed drenching for 4 and 8 days increases in the root length were greater by 15 and 8%, respectively.

Koziara Z., 1999. Effect of presowing treatment of seeds on the growth of Eucalyptus gunnii Hook. seedlings. Folia Horticulturae 11/2: 95-104.