THE CO2 INFLUENCE ON THE GROWTH

Abstract

This paper presents an experiment regarding the influence of CO2 on the growth of Chamascyparis Lawsoniana plants. Increasing the CO2 content in solariums, from 0.07% to 0.1% has a result in increasing the growth rate. In this experiment were used Chamaecyparis lawsoniana Stewartii plants. The plant is very valuable through his decorative effect, has slow growing, 4-5 m high (Iliescu, 1998). Chamaecyparis lawsoniana Stewarti is not very used in our country because of the absence of the plant material as a result of the slow growing and the low rate of multiplication. The experiment had two variants: V1 – control; V2 – CO2 treatment. Each variant was 100m² surfaces and contained 400 plants of Chamaecyparis lawsoniana Stewartii. The planting was made in the middle of the April, in containers The administration of CO2 begun 1 hour after sun rising and it stopped 2 hours before sun set. 1 liter of CO2, on pressure of 1 atm. and temperature of 20ºC, has 2 grams weight. To obtain 0.1% CO2 concentration in the air, where used 6 grams of CO2/hour/m².The uniform assessment of CO2 was made by using polietilen tubs, 30 m length, penetrated on each meter. The CO2 was administrated between first of April and 10th of September. Comparing the plants growth in 2002/2006 it is shown that the high of the stem is 9 cm higher on the plants of Variant 2, with very distinct meaningful difference as the control.