DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 3-4/2009 str. 19 <-- 19 --> PDF |
V.Topić, L. Butorac, Z. Đurđević, B. Kekelić, G. Jelić: UTJECAJ TIPAKONTEJNERANARAST I RAZVOJ ...Šumarski list br. 3–4, CXXXIII (2009), 121-134 each container during plant measurements. Measurements were carried out successively every month on three occasions. Each time three plants were chosen (maximal, medium and minimal height) from each container for morphologic determination. Plant heights were measured with a ruler in cm and root collars with a shubler. The weight of the aboveground and underground plant part was measured with precise scales to two decimals. Scener STD 1600 and Vin RHizo Pro software were used to determine overall length of all the root parts by diameter degrees, as well as total volume, volume by diameter degrees, the average root diameter and root area. In the experimental plot of Podi, the block method was used to prepare the soil and plant the seedlings in the soil undermined with a ripper, and so was classical afforestation in the holes of 40 x 40 x 40 cm. A total of 826 plants were planted in three separate blocks of 40 x 50 m and monitored. After planting one-year-old seedlings of common cypress, the heights of all the planted stock were measured annually over the period 2003 to 2008 and the survival percentage was determined. A correlation-regression analysis was applied to determine the quantitative grades of particular variables (container type, planting method) on the growth and development of common cypress seedlings in the nurseries and in the experimental plot. Container volume had a strong and positive effect on the growth and development of one-year-old seedlings of common cypress in the nursery (Table 1). Plants grown in larger-volume containers (PVC 7/24) attained bigger heights (r2 = 0.981), bigger plant weight (r2 = 0.985) and bigger root weight (r2 = 0.792), compared to plants grown in smaller containers (B18), particularly in Bosnaplast 12 containers (Figure 1). Research showed that cypress seedlings developed differently not only in different but also in the same container type. The first analysis of the root system done four months after sowing showed very poor root growth of cypress seedlings, especially of less developed ones, in all container types (Figure 2). Only by the end of October and the beginning of November was root development satisfactory in better developed plants grown in Bosnaplast 12 containers, but not so in Bosnaplast 18 and PVC 7/24 containers. The root system developed better and was richer in a PVC bag than in a B18 container, and especially in a B12 container (Figure 4). During one vegetation, no spiraling of the root system was observed in plants grown in these containers, or it was very slight (Figures 3 and 5), whereas root development, particularly in poorly developed plants, was not adequate. For this reason, seedlings of common cypress should be kept in PVC 7/24 containers and in B18 containers for more than one vegetation, but not longer than for two vegetations. Table 2 shows data on average heights of common cypress plants and their survival percentages by container type and planting method in the first five years of research in the experimental plot. According to the Table, at the end of the first vegetation period, taking into account all container types and afforestation methods, the survival of common cypress plants ranged from 28.0 % to 78.8 %. The best results were obtained in the soil undermined with a ripper and planted with seedlings from PVC 7/24 containers (78.8 %), followed by plants from B18 containers (62.5 %), and plants from B12 containers (61.3 %). In the experimental plot the survival percentage of common cypress planted with a classical method in dug holes was by 50 % lower than that of plants planted in the ripped soil in all container types. Regression analysis showed the dependence of plant survival percentage and plant height in the plot on container type and planting method (Figures 7 and 8). Plants of common cypress growing in larger containers and undermined soil attained bigger heights (r2 = 0.981) and bigger survival percentage (r2 = 0,792) than those planted in holes. |