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Growth Response of Wheat to CO 2 Enrichment and Different Levels of Mineral Nutrition 1
Author(s) -
Sionit Nasser,
Mortensen D. A.,
Strain B. R.,
Hellmers H.
Publication year - 1981
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1981.00021962007300060027x
Subject(s) - nutrient , shoot , zoology , chemistry , dry matter , agronomy , dry weight , horticulture , biology , organic chemistry
Most previous studies on the influence of CO 2 concentration on plant growth have investigated the effect of atmospheric CO 2 enrichment alone. Little attention has been given to possible interactions between CO 2 enrichment and nutrient supply. The objective of this study was to characterize the long‐term effects of atmospheric CO 2 enrichment on growth components of wheat ( Triticum aestivum L.) grown under different nutritional levels. Growth and yield responses of spring wheat (cv. GWO1809) to two (350 and 675 ppm) CO 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 2 atmosphere produced more total dry matter at each nutrient level compared to those grown in 350 ppm CO 2 . The root:shoot ratio decreased with increased nutritional level in both CO 2 concentrations. Total weight and number of seeds produced in high CO 2 were greater than those produced in low CO 2 under similar nutrition. In low CO 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 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 2 than those grown in 350 ppm CO 2 .