Growth response of wheat in CO/sub 2/ enrichment and different levels of mineral nutrition

Journal Article · · Agron. J.; (United States)

OSTI ID:6328534

Sionit, N; Mortensen, D A; Strain, B R; Hellmers, H

Most previous studies on the influence of CO/sub 2/ concentration on plant growth have investigated the effect of atmospheric CO/sub 2/ enrichment alone. Little attention has been give to possible interactions between CO/sub 2/ enrichment and nutrient supply. The objective of this study was to characterize the long-term effects of atmospheric CO/sub 2/ enrichment on growth components of wheat (Triticum aestivum L.) grown under different nutritional levels. Growth and yield responses of spring wheat (cv. GWO 1809) to two (350 and 675 ppM) CO/sub 2/ and four (full strength, 1/2, 1/8, or 1/16 strength Hoagland's solution No. 1) nutritional levels were measured in controlled environment chambers at day/night temperature of 26/20 C. Plants were grown from seed and were irrigated with respective nutrient solutions three times daily until maturity. Plants grown in a 675 ppM CO/sub 2/ atmosphere produced more total dry matter at each nutrient level compared to those grown in 350 ppM CO/sub 2/. The root: shoot ratio decreased with increased nutritional level in both CO/sub 2/ concentrations. Total weight and number of seeds produced in high CO/sub 2/ were greater than those produced in low CO/sub 2/ under similar nutrition. In low CO/sub 2/, seed weight and number increased with each increase in nutrient concentration up to the one-half strength level and then decreased with full strength. In high CO/sub 2/, however, increasing the nutritional level from one-half to full strength did not decrease seed weight and number significantly. As the plants' grew older, the increments of increase in total plant dry weight during harvest intervals were always greater in plants grown in 675 ppM CO/sub 2/ than those grown in 350 ppM CO/sub 2/. 18 refs., 3 figs., 2 tabs.

• OSTI ID: 6328534
• Journal Information: Agron. J.; (United States), Vol. 73
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
BIOLOGICAL STRESS
GLOBAL ASPECTS
CARBON DIOXIDE
QUANTITY RATIO
NUTRIENTS
VARIATIONS
PLANT GROWTH
MODIFICATIONS
COMPARATIVE EVALUATIONS
GREENHOUSE EFFECT
OPTIMIZATION
PHOTOSYNTHESIS
WHEAT
CARBON COMPOUNDS
CARBON OXIDES
CEREALS
CHALCOGENIDES
CHEMICAL REACTIONS
GRASS
GROWTH
LILIOPSIDA
MAGNOLIOPHYTA
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PLANTS
SYNTHESIS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)