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sodininkystė ir daržininkystė 25(4)

sodininkystė ir daržininkystė 25(4)

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2 pav. Apðvitos 10 kJ m -2 p -1 UV-B efektyvumas áva<strong>ir</strong>iems pomidorø rodikliams.<br />

Palyginimas % su kontroliniais neðvitintais augalais<br />

Fig. 2. Effect of 10 kJ m -2 d -1 UV-B radiation on different plant characters of tomato.<br />

Comparison (%) with the level to of control plants without <strong>ir</strong>radiation<br />

Sumaþëjo <strong>ir</strong> lapo plotas (3 pav.), taèiau 10 kJ m -2 p -1 UV-B poveikis labai pastebimai<br />

priklausë nuo t<strong>ir</strong>iamojo lapo padëties ant augalo <strong>ir</strong> apðvitos UV-B trukmës. Kai<br />

apðvita truko 10 parø, treèiojo lapo nuo apaèios plotas sumaþëjo labai neþymiai, taèiau<br />

juo lapai buvo aukðèiau ant stiebo, tuo UV-B efektas lapø plotui buvo stipresnis<br />

(3 pav., a). Kai apðvita 10 kJ m -2 p -1 UV-B truko ilgiau – 14 dienø, lapø plotas dar<br />

labiau sumaþëjo (3 pav., b), netgi to paties treèiojo nuo apaèios lapo, kuriam prieð tai<br />

poveikis buvo paklaidos ribose (palyg. 3 pav., a <strong>ir</strong> b).<br />

3 pav. Sumaþëjæs lapø plotas po pomidorø apðvitos 10 kJ m -2 p -1 UV-B.<br />

Efekto priklausomumas nuo apðvitos trukmës <strong>ir</strong> lapo padëties ant augalo:<br />

a – apðvita 10 parø; b – apðvita 14 parø; 3-L; 4-L; 5-L – lapo padëtis ant<br />

augalo nuo apaèios á v<strong>ir</strong>ðø<br />

Fig. 3. Decrease of leaf area after <strong>ir</strong>radiation of tomato plants with 10 kJ m -2 d -1 UV-B.<br />

Dependence from prolongation of treatment and of leaf position on plant:<br />

a- treatment for 10 days; b – treatment for 14 days; 3-L; 4-L;<br />

5-L – leaf position from bottom to upwards<br />

244

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