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V ekološki pridelavi je izziv, kako pridelati kakovostne sadike, predvsem, kako zagotoviti ustrezno oskrbo s hranili. Ena izmed rešitev za zagotovitev ustrezne količine hranil bi lahko bila uporaba naravnega, organskega vira dušika, ki je v tekoči obliki in ga lahko dodamo ob zalivanju sadik. Izvedli smo poskus na sadikah zelja (Brassica oleracea var. capitata L.) in solate (Lactuca staiva L.). Štiri plošče smo uporabili za kontrolne sadike in jih namakali le v vodi, druge štiri plošče pa v vodi z dodatkom aminokislin (AK, pripravek Delfan). Ko so sadike dosegle velikost primerno za presajanje (t.i. prodajna velikost), smo prešteli število razvitih listov, razvitost korenin, višino sadike, svežo maso, vsebnost klorofila, površino listov ter maso suhe snov. Sadike solate, ki so bile namakane v vodi z AK (14,6 cm), so bile višje od kontrolnih sadik (13,0 cm), pri zelju se razlike niso pokazale. Razlike v številu listov se niso pokazale ne pri solati ne pri zelju. Kontrolne sadike in sadike, namakane v vodi z AK, so po razvitosti korenin spadale v razred dobro razvitega koreninskega sistema. Sveža masa sadik zelja je bila za 3,03 g večja pri sadikah namakanih v vodi z AK, pri solati pa za 0,25 g. Površina listov je bila pri sadikah solate in zelja, namakanih v vodi z AK, večja od kontrolnih sadik. Sadike namakane v vodi z AK so vsebovale več klorofila pri solati za 4,34 %, pri zelju pa za 3,67 % kot kontrolne sadike. Gnojene sadike so porabile tudi več vode. In organic production, the challenge is to ensure the appropriate quality of the seedlings, in particular to guarantee a sufficient supply of nutrients. One solution to ensure a sufficient amount of fertilizer is to use a natural (organic) nitrogen source, which is available in liquid form and can be added by irrigating the seedlings. We conducted an experiment with cabbage (Brassica oleracea var. capitata L.) seedlings and lettuce (Lactuca staiva L.) seedlings. Four plates with seedlings were used for control and soaked only in water, the other four plates in water with added amino acids (AA, as Delfan solution). When the seedlings had reached a size suitable for transplantation (i.e. sales size), we measured the number of developed leaves, root development, height of seedlings, fresh weight, chlorophyll content, leaf surface and mass of dry matter. Lettuce seedlings soaked in water with AA (14,6 cm) were higher than control seedlings (13,0 cm), in cabbage seedlings no differences were not obvious. Differences in leaf number were not shown in either lettuce or cabbage. Root systems of control seedlings and seedlings that were fertilized with AA belonged to the class of well-developed root systems. The fresh weight of cabbage was 3,03 g higher of seedlings fertilized with AA, and 0,25 g for lettuce seedlings. The leaf area of seedlings fertilized with AA was also larger than that of control seedlings. The AA fertilized seedlings contained more chlorophyll than the control seedlings, for lettuce by 4,34 % and cabbage by 3,67 %. It was also shown that fertilized seedlings used more water. |
