Claim · model-written summary
DD produced greater green stem biomass than TD.
- Material
- DDe2
- Outcome
- GSBe2
- Direction
- greatere2
- Value
- 92.5–219.1 Mg ha−1e2
- Qualifier
- 16.5–48.9 Mg ha−1e2
- Comparator
- TDe2
PopulusNot reportedGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Productivity and Profitability of Poplars on Fertile and Marginal Sandy Soils under Different Density and Fertilization Treatments”
e2“DD produced greater GSB (92.5–219.1 Mg ha−1) than DM (54–60.2 Mg ha−1) and TD (16.5–48.9 Mg ha−1), and this was greater under the higher density (85.9–148.6 Mg ha−1 vs. 55.9–124.9 Mg ha−1)”
Title
Solomon B. Ghezehei; Alexander L. Ewald; Dennis W. Hazel; et al. Forests 2021. doi:10.3390/f12070869
Other claims from this paper (19)
- Association DD and DM poplar genotypes had higher survival (>93%) than TD.
- Association DD produced greater green stem biomass than DM.
- Association Green stem biomass was greater under the higher planting density.
- Association Fertilization significantly increased green stem biomass on fertile soil but not on marginal soils.
- Association A higher fertilization rate did not significantly enhance green stem biomass.
- Association Leaf rust was higher on fertile soil (82%) than on marginal soils (20–22%).
- Association Poplar TD ‘185’ had higher leaf rust (51%) than the other genotypes (34%).
- Association Chrysomela scripta beetle damage was higher under the higher planting density (+42%).
- Association Chrysomela scripta damage was higher on TD ‘185’ (50%) than on the other genotypes (>38%).
- Association Leaf area index was higher on fertile soil (1.85 m2 m−2) than on marginal soils (1.35–1.64 m2 m−2).
- Association Leaf area index was higher under the lower planting density (1.67 m2 m−2) than under the higher density (1.56 m2 m−2).
- Association The high green stem biomass producer DD ‘356’ had the lowest leaf area index (1.39 m2 m−2).
- Observation Foliar nitrogen of DD ‘140’ was 1.95%, varying among genomic groups.
- Observation Foliar nitrogen of TD ‘185’ was 1.80%, varying among genomic groups.
- Observation The plots were unprofitable at a delivered price of 27 USD Mg−1.
- Observation The biggest profitability barriers were the high costs of higher density establishment and weed control.
- Observation Best-case DD treatment combinations would be cost-effective if the price rose by 50% (USD 37.54 Mg−1).
- Observation Best-case DD treatment combinations would be cost-effective with rotations of 12 years on fertile soil and longer on marginal soils.
- Recommendation Cost-effective poplar production requires stringent, site-specific weed control, which matters more than fertilizer applications.