Abstract
Effect of three-dimension fertilizing mode (3-DFM) using CO2 and liquid/solid fractions of the digesate from anaerobic digester was investigated in quality and yield of lettuce. CO2, solid fraction of digestate (SFD), and liquid fraction of digestate (LFD) were used as fertilizer for gaseous fertilizer, the base fertilizer, and foliar fertilizer, respectively. The result showed that the 3-DFM was appropriate for lettuce. Lettuce’s plant height, width and number of leaves growth amount were 29.25 cm, 22.38 cm, and 16.2 cm, which were 26.8%, 16.5%, and 18.4% higher than the control, respectively. The overall yield of lettuce was 30.78% more than that of the control. The soluble sugar content and the chlorophyll content in lettuce was the highest, which were 29.4% and 11.4% higher than the control. Under the CO2 and SFD condition, the content of vitamin C in lettuce, the content of free amino acid, crude protein and crude fiber contents of lettuce were the highest. The experimental study can provide an effective way to improve yield and quality of lettuce and utilize biogas plants wastes.
Highlights
CO2 is a greenhouse gas of tremendous hazards, and is an indispensible important raw material during photosynthesis of green plants
Effect of three-dimension fertilizing mode (3-DFM) using CO2 and liquid/solid fractions of the digesate from anaerobic digester was investigated in quality and yield of lettuce
The result showed that the 3-DFM was appropriate for lettuce
Summary
CO2 is a greenhouse gas of tremendous hazards, and is an indispensible important raw material during photosynthesis of green plants. A large amount of CO2 will be absorbed in the photosynthesis of plants, for example, 1-6 tons of CO2 will be consumed for synthesis of each ton of dry substances (Yu, 2008). The content of CO2 is 0.03% in the air. The content of CO2 ordinary green plants need was 0.01%-0.1% (Zhu & Shi, 2008). Due to the relatively closed environment in agricultural production in facilities with greenhouse sheds being the major construction type, the density of CO2 in the greenhouse in winter, early spring and autumn of low temperature was far lower than that in the environmental atmosphere, and the crops were hungry for CO2 with their growth and development being seriously restricted. CO2 was used for over 90% of tomato, cucumber, sweet pepper and strawberry as fertilizer in Holland (Madsen, 1974)
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