The effect of CO2 and temperature combinations on Chenopodium album L. early growth
¹Lithuanian University of Agriculture, Dept. of Soil Management, Studentu 11, LT-53067Akademija, Kaunas r., Lithuania; tel.: +370 37 75 22 66; fax: +370 37 75 22 93;e-mail: vytautas.pilipavicius@lzuu.lt, romanr@one.lt
²Lithuanian University of Agriculture, Dept. of Plant Science and Animal Husbandry, Studentu11, LT-53067 Akademija, Kaunas r., Lithuania; tel.: +370 37 75 23 14;fax: +370 37 75 22 93; e-mail: astara@info.lzuu.lt, algir@nora.lzua.lt
Abstract:
Vegetative pots experiments were carried out at the Phytotron of the Lithuanian Institute of Horticulture in the period between January and September 2005. Four levels of CO2 concentration: 350 ppm (control treatment), 700 ppm, 1500 ppm, 3000 ppm and two levels of temperature regimes: 21oC/17oC (control treatment) and 25°C/21°C, photoperiod of 16/8 h, and their combinations were used in testing Chenopodium album L. early growth. The level of radiation (PAR) was 170 micro-mol m-2 s-1.Experimental data proved that the concentration of CO2, which had been graduallyincreasing and reached 1500 ppm, added to the length of Chenopodium album L. sprouts and increased the biomass of sprouts and roots. Chenopodium album L. was not able to adapt to further increase of CO2 concentration and had a tendency to retard the early growth. Increase of the environment temperature to 25°C/21°C initiated more intensive early growth of Chenopodium album L. increasing sprout length and quantity of the accumulated biomass. However, under the conditions of 25oC/21oC, the 700 ppm concentration of CO2 already had a negative impact on the early growth of Chenopodium album L.
Key words:
Chenopodium album L., CO2, early growth, temperature