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Genotypic Variation for Shoot N Concentration and Response to Water Deficits in Soybean

Dep. of Crop, Soil, and Environmental Sciences, Univ. of Arkansas, 1366 W. Altheimer Dr., Fayetteville, AR 72704

View larger version (28K): [in a new window]   Fig. 1. Shoot N concentration (g N kg–1 dry weight) of soybean ancestors, Jackson, and KS4895 from the 2-yr field study at Keiser, AR. Harvest 1 was made when soybean reached 95% full-canopy coverage and Harvest 2 was made 22 and 16 d later in 1999 and 2000, respectively. Main effect of genotypes was significant at Harvest 1, and there was a genotype x irrigation treatment interaction at Harvest 2. There was no interacting effect of year with genotype or irrigation treatment on shoot N concentration at Harvests 1 or 2. LSD (P = 0.05) for Harvest 1 is 1.3 and for Harvest 2 comparing genotypes within irrigation is 1.5 and between irrigation is 1.9. An asterisk (*) indicates a significant difference between well-watered (WW) and water-deficit (WD) shoot N concentration within a genotype at Harvest 2. Maturity group is given below the genotype name.

View larger version (18K): [in a new window]   Fig. 2. Genotypic averages for well-watered (WW) shoot ureide concentration versus WW shoot N concentration at Harvest 2 for the 2000 field experiment at Keiser, AR. Only those genotypes that are specifically discussed in the text of this manuscript are identified.

View larger version (26K): [in a new window]   Fig. 3. Change in shoot N concentration of eight soybean genotypes in response to the fraction of transpirable soil water (FTSW) to which pots were watered daily during a 10-d water deficit in the greenhouse experiment. Fraction of transpirable soil water of 0.6 was considered well watered (WW) and decreasing FTSW values represent an increasing water deficit (WD). Bars represent LSD (0.05) for treatment separation within a FTSW level. Numbers in parentheses to the right of a genotype indicate the shoot N content (g N kg–1 dry weight) for plants in the WW (FTSW = 0.60) treatment. There was a significant genotype effect for WW shoot N (LSD = 3.9 g kg–1, P = 0.05). Data points above the zero reference line on the y axis represent an increase in shoot N in response to WD and those below the line represent decrease in shoot N in response to WD.