| Abstract | Vlaga u tlu jedan je od glavnih vanjskih čimbenika koji utječe na nicanje korovne vrste Chenopodium album (loboda). Cilj ovog istraživanja bio je utvrditi biološki vodni potencijal (Ψb), odnosno minimalnu količinu vlage u tlu koja je potrebna za klijanje lobode. Za potrebe istraživanja sjeme lobode sakupljeno je 2016. na pokušalištu Šašinovec. U svrhu simulacije vodnog stresa u tlu korišteno je sedam različitih koncentracija otopina polietilenglikola (PEG): -0,05, -0,10, -0,25, -0,38, -0,50, -0,80, -1,00 MPa i kontrolni tretman (0,00 MPa) prekriven samo destiliranom vodom. Sjeme lobode posijano je u plastične posude i postavljeno u klima komoru pri konstantnoj temperaturi od 25°C i s fotoperiodom od 12 sati dan: 12 sati noć. Rezultati istraživanja ukazuju da bijela loboda klije dobro na koncentracijama od -0,05 MPa (48%) do -0,50 MPa (44%), odnosno u tom rasponu nije utvrđena statistički značajna razlika u klijavosti. Klijavost statistički značajno pada tek pri -0,80 MPa (28%) i -1,00 MPa (11%). Dinamika klijanja razlikovala se ovisno o istraživanoj koncentraciji PEG-a. Povećanjem koncentracije povećavao se i broj dana potrebnih za klijanje, pa je tako najkraći period potreban za početak klijanja (t10) iznosio 2,0 dana, a najdulji period 4,5 dana. Razdoblje potrebno za 50%-tno klijanje (t50) kretalo se od 3,4 do 9,6 dana, dok je za 90%-tno klijanje (t90) bilo potrebno od 5,4 do 21,4 dana. Utvrđen biološki vodni potencijal za vrstu Chenopodium album za područje kontinentalne Hrvatske, lokalitet Šašinovec, iznosi -1,38 MPa. Utvrđena je statistički značajna razlika između biološkog vodnog potencijala „hrvatskog“ ekotipa lobode u odnosu na „talijanski“ ekotip, lokalitet Veneto, iste korovne vrste (-0,96 MPa). |
| Abstract (english) | Soil moisture is one of the main external factors that affect the growth of Chenopodium album (common lambsquarter). The aim of this study was to determine the biological water potential (Ψb), i.e. the minimum amount of moisture in the soil required for germination. The seeds of the common lambsquarter used in this study were collected in 2016 at the experimental station Šašinovec. For the purpose of simulating water stress in the soil seven different concentrations of polyethylene glycol (PEG) solutions were used: -0,05, -0,10, -0,25, -0,38, -0,50, -0,80, -1,00 MPa and a control (0,00 MPa) covered only with distilled water. The common lambsquarter seeds were planted in plastic containers and placed in a climatic chamber at a constant temperature of 25 ° C with a photoperiod of 12 hours day: 12 hours night. The results of the study indicate that the common lambsquarter germinates well at concentrations between -0,05 MPa (48%) and -0,50 MPa (44%), i.e. in this range there was no statistically significant difference in germination. A statistically significant decrease in germination quality was seen only at -0,80 MPa (28%) and -1,00 MPa (11%). The dynamics of germination differed depending on the concentration. As the concentration increased, decereased also the number of days required for germination. The shortest period required for germination (t10) was 2,0 days and the longest 4,5 days. The center of germination (t50) ranged from 3,4 to 9,6 days, while the germination time (t90) was 5,4 to 21,4 days. The biological water potential for Chenopodium album in continental Croatia, the locality of Šašinovec, was determined to be -1,38 MPa. There was also a statistically significant difference between the biological water potential of the “Croatian” ecotype of common lambsquarter and the “Italian”, locality of the Veneto, ecotype of the same species (-0,96 MPa). |
