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Published in Scientific Papers. Series B, Horticulture, Vol. LXIII, Issue 1
Written by Stoyan FILIPOV, Kostadin KOSTADINOV, Toni SHOPOVA, Radi RADEV

A greenhouse study was conducted to evaluate the effect of different seedling mixture on growth and development of lettuce transplants cv. Melvine for winter greenhouse production. As a main substrate of mixture was used peat – Dorpet. Three types of medium was an analyzed: Peat Perlite and pine shavings in the following combination: 1.Peet100% (control); 2.Peet 88% + Perlite 12%; 3.Peet 80% + Perlite 10% + Pine shavings 10%; 4.Peet 70% + Perlite 10 % + Pine shavings 20%. Three readings were made in 7 days. On the 30th day of germination, the plants of all varieties are at same phase – second true leaf. In all indicators of the plant’s organs and at the mass of whole plant with the highest values is the control. On the 37th day the tendency of first reading is retained, as the plants of four variants are in phase 3th true leaf. At the 44th day, the main trends and characteristics of the previous two are preserved. In conclusion, it can be said that the addition of pine sawdust influences the development but keeps the growth. At 10% addition of pine sawdust nurseries have similar characteristics to those of variant 2 with Peat 88% + Perlite 12%.

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