scholarly journals Nitrogen Fertilization of Black Walnut (Juglans nigra L.) During Plantation Establishment. Morphology and Production Efficiency

2013 ◽  
Vol 59 (4) ◽  
pp. 453-463 ◽  
Author(s):  
Rosa C. Goodman ◽  
Juan A. Oliet ◽  
Guillermo Pardillo ◽  
Douglass F. Jacobs
Keyword(s):  
Nitrogen Fertilization ◽  
Production Efficiency ◽  
Black Walnut ◽  
Juglans Nigra ◽  
Plantation Establishment

Nitrogen fertilization of black walnut (Juglans nigra L.) during plantation establishment. Physiology of production

2013 ◽  
Vol 133 (1) ◽  
pp. 153-164 ◽  
Author(s):  
Rosa C. Goodman ◽  
Juan A. Oliet ◽  
Joshua L. Sloan ◽  
Douglass F. Jacobs
Keyword(s):  
Nitrogen Fertilization ◽  
Black Walnut ◽  
Juglans Nigra ◽  
Plantation Establishment

scholarly journals Nitrogen Recovery from Enhanced Efficiency Fertilizers and Urea in Intensively Managed Black Walnut (Juglans nigra) Plantations

Forests ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 352
Author(s):  
Joshua L. Sloan ◽  
Francis K. Salifu ◽  
Douglass F. Jacobs
Keyword(s):  
Black Walnut ◽  
Juglans Nigra ◽  
Water Soluble ◽  
Growth And Yield ◽  
N Recovery ◽  
Competing Vegetation ◽  
Fertilizer N Recovery ◽  
Coated Urea ◽  
Intensively Managed ◽  
Polymer Coated Urea

Intensively managed forest plantations often require fertilization to maintain site fertility and to improve growth and yield over successive rotations. We applied urea-based “enhanced-efficiency fertilizers” (EEF) containing 0.5 atom% 15N at a rate of 224 kg N ha−1 to soils under mid-rotation black walnut (Juglans nigra L.) plantations to track the fate of applied 15N within aboveground ecosystem components during the 12-month period after application. Treatments included Agrotain Ultra (urea coated with a urease inhibitor), Arborite EC (urea coated with water-soluble boron and phosphate), Agrium ESN (polymer-coated urea), uncoated urea, and an unfertilized control. Agrotain Ultra and Arborite EC increased N concentrations of competing vegetation within one month after fertilization, while neither Agrium ESN nor uncoated urea had any effect on competing vegetation N concentrations during the experiment. Agrotain Ultra and Arborite EC increased δ15N values in leaves of crop trees above those of controls at one and two months after fertilization, respectively. By contrast, Agrium ESN and uncoated urea had no effect on δ15N values in leaves of crop trees until three months after fertilization. Fertilizer N recovery (FNR) varied among ecosystem components, with competing vegetation acting as a sink for applied nutrients. There were no significant differences in FNR for all the urea-based EEF products compared to uncoated urea. Agrium ESN was the only EEF that exhibited controlled-release activity in this study, with other fertilizers behaving similarly to uncoated urea.

Antitumor Activity of Juglans nigra (Black Walnut) Extractives

1968 ◽  
Vol 57 (10) ◽  
pp. 1674-1677 ◽  
Author(s):  
Umesh C. Bhargava ◽  
Bertis A. Westfall
Keyword(s):  
Antitumor Activity ◽  
Black Walnut ◽  
Juglans Nigra

scholarly journals Identifying Antibacterial Compounds in Black Walnuts (Juglans nigra) Using a Metabolomics Approach

Metabolites ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 58 ◽  
Author(s):  
Khanh-Van Ho ◽  
Zhentian Lei ◽  
Lloyd Sumner ◽  
Mark Coggeshall ◽  
Hsin-Yeh Hsieh ◽  
...  
Keyword(s):  
Bioactive Compounds ◽  
Cost Effective ◽  
Bioactive Compound ◽  
The United States ◽  
Black Walnut ◽  
Juglans Nigra ◽  
Compound Identification ◽  
Antibacterial Compounds ◽  
Nut Production ◽  
Health Promoting

Black walnut (Juglans nigra L.) is one of the most economically valuable hardwood species and a high value tree for edible nut production in the United States. Although consumption of black walnut has been linked to multiple health-promoting effects (e.g., antioxidant, antimicrobial, anti-inflammatory), the bioactive compounds have not been systematically characterized. In addition, the associations between different black walnut cultivars and their health-promoting compounds have not been well established. In this study, the kernels of twenty-two black walnut cultivars selected for nut production by the University of Missouri Center for Agroforestry (Columbia, MO, USA) were evaluated for their antibacterial activities using agar-well diffusion assay. Among the selected cultivars, four black walnut cultivars (i.e., Mystry, Surprise, D.34, and A.36) exhibited antibacterial activity against a Gram-positive bacterium (Staphylococcus aureus), whereas other cultivars showed no effect on the inhibition of this bacterium. The antibacterial compounds showing the strongest activity were isolated with bioassay-guided purification and identified using a metabolomics approach. Six antibacterial bioactive compounds responsible for antimicrobial activity were successfully identified. Glansreginin A, azelaic acid, quercetin, and eriodictyol-7-O-glucoside are novel antibacterial compounds identified in the kernels of black walnuts. The metabolomics approach provides a simple and cost-effective tool for bioactive compound identification.

scholarly journals Comparison of the growth pattern of black walnut (Juglans nigra L.) in two riparian forests in the region of South Moravia, Czech Republic

2011 ◽  
Vol 57 (No. 3) ◽  
pp. 107-113 ◽  
Author(s):  
L. Šálek ◽  
P. Hejcmanová
Keyword(s):  
Czech Republic ◽  
Growth Pattern ◽  
Tree Height ◽  
Management Plan ◽  
Black Walnut ◽  
Riparian Forests ◽  
Juglans Nigra ◽  
The Czech Republic ◽  
The Mean ◽  
South Moravia

The black walnut (Juglans nigra L.), an introduced species into the Czech Republic, is planted for its production of valuable timber. A systematic study of the black walnut growth rate at different localities and consequently the creation of standard volume tables under Central European conditions therefore appear to be of high relevance. The aim of our study was to reveal the black walnut growth pattern in its pure stands in two riparian forests along the Morava and Svratka River (Strážnice locality and Židlochovice locality, respectively). To describe and to compare relationships among diameter at breast height (dbh), tree height and age, we used a forest management plan and measured 573 and 670 trees in pure sample stands at Strážnice and Židlochovice, respectively. We found out that the measured mean DBH and mean height were consistently higher in Strážnice, however the relationships of DBH to height, age to DBH, and age to height showed the same pattern at both localities. The mean heights of trees were 16.3, 24.1, 28.7, 31.9, and 34.5 m in 20, 40, 60, 80, and 100 year age classes and were consistently taller in comparison with other, mainly European, regions. Therefore our results suggest the high potential of black walnut in timber production in riparian forests in the Czech Republic, mainly in the South Moravian region.

scholarly journals Effect of black walnut (Juglans nigra) on the understorey vegetation – a case study of South Moravian forests (Czech Republic)

2017 ◽  
Vol 63 (No. 3) ◽  
pp. 136-148 ◽  
Author(s):  
Hrib Michal ◽  
Podrázský Vilém ◽  
Matějka Karel ◽  
Viewegh Jiří
Keyword(s):  
Detrended Correspondence Analysis ◽  
Black Walnut ◽  
Juglans Nigra ◽  
Soil Reaction ◽  
Brachypodium Sylvaticum ◽  
Understorey Vegetation ◽  
Alluvial Forests ◽  
Native Tree Species ◽  
Forest Phytocoenosis

The article analyses the influence of black walnut on forest phytocoenosis in South Moravian forests and assesses how its representation may affect the understorey vegetation of the forest ecosystems. In July 2014, 31 relevés were processed in the South Moravian forests. These were stands of pure black walnut (Juglans nigra) as well as black walnut with small-leaved lime (Tilia cordata), along with neighbouring autochthonous stands (pure ash – European and narrow-leaved), oak (summer oak), or their mixtures. Ellenberg’s indicator values reveal differences in the plant communities under black walnut comparing those under native tree species for the variables nitrogen, soil reaction and temperature. In addition, total cover is significantly higher under walnut. Other differences are visible from the detrended correspondence analysis ordination. The study also confirmed that in the stands of black walnut the preference of some species is suppressed, for example Brachypodium sylvaticum and Poa nemoralis in alluvial forests and Melica uniflora in hilly forests.

Genetic differentiation and spatial structure of Geosmithia morbida, the causal agent of thousand cankers disease in black walnut (Juglans nigra)

2013 ◽  
Vol 60 (2) ◽  
pp. 75-87 ◽  
Author(s):  
Denita Hadziabdic ◽  
Lisa M. Vito ◽  
Mark T. Windham ◽  
Jay W. Pscheidt ◽  
Robert N. Trigiano ◽  
...  
Keyword(s):  
Genetic Differentiation ◽  
Spatial Structure ◽  
Black Walnut ◽  
Causal Agent ◽  
Juglans Nigra ◽  
Geosmithia Morbida ◽  
Thousand Cankers Disease
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