Effect of thinning, pruning and nitrogen fertiliser application on light interception and light-use efficiency in a young Eucalyptus nitens plantation

2013 ◽  
Vol 288 ◽  
pp. 21-30 ◽  
Author(s):  
David I. Forrester ◽  
John J. Collopy ◽  
Christopher L. Beadle ◽  
Thomas G. Baker
Keyword(s):  
Light Interception ◽  
Light Use Efficiency ◽  
Eucalyptus Nitens ◽  
Nitrogen Fertiliser ◽  
Use Efficiency ◽  
Fertiliser Application

Enhanced light interception and light use efficiency explain overyielding in young tree communities

2021 ◽  
Author(s):  
Laura J. Williams ◽  
Ethan E. Butler ◽  
Jeannine Cavender‐Bares ◽  
Artur Stefanski ◽  
Karen E. Rice ◽  
...  
Keyword(s):  
Light Interception ◽  
Light Use Efficiency ◽  
Young Tree ◽  
Tree Communities ◽  
Use Efficiency

Variation in canopy structure, leaf area, light interception and light use efficiency among Eucalyptus clones

2020 ◽  
Vol 463 ◽  
pp. 118038 ◽  
Author(s):  
Eduardo M. de Mattos ◽  
Dan Binkley ◽  
Otavio C. Campoe ◽  
Clayton A. Alvares ◽  
Jose L. Stape
Keyword(s):  
Leaf Area ◽  
Canopy Structure ◽  
Light Interception ◽  
Light Use Efficiency ◽  
Use Efficiency

scholarly journals Adding Far-Red to Red-Blue Light-Emitting Diode Light Promotes Yield of Lettuce at Different Planting Densities

2021 ◽  
Vol 11 ◽  
Author(s):  
Wenqing Jin ◽  
Jorge Leigh Urbina ◽  
Ep Heuvelink ◽  
Leo F. M. Marcelis
Keyword(s):  
Leaf Area ◽  
Biomass Production ◽  
Plant Biomass ◽  
Stem Elongation ◽  
Incident Light ◽  
Dry Weight ◽  
Light Interception ◽  
Planting Density ◽  
Light Use Efficiency ◽  
Use Efficiency

The economic viability and energy use of vertical farms strongly depend on the efficiency of the use of light. Increasing far-red radiation (FR, 700–800 nm) relative to photosynthetically active radiation (PAR, 400–700 nm) may induce shade avoidance responses including stem elongation and leaf expansion, which would benefit light interception, and FR might even be photosynthetically active when used in combination with PAR. The aims of this study are to investigate the interaction between FR and planting density and to quantify the underlying components of the FR effects on growth. Lettuce (Lactuca sativa cv. Expertise RZ) was grown in a climate chamber under two FR treatments (0 or 52 μmol m–2 s–1) and three planting densities (23, 37, and 51 plants m–2). PAR of 89% red and 11% blue was kept at 218 μmol m–2 s–1. Adding FR increased plant dry weight after 4 weeks by 46–77% (largest effect at lowest planting density) and leaf area by 58–75% (largest effect at middle planting density). Radiation use efficiency (RUE: plant dry weight per unit of incident radiation, 400–800 nm) increased by 17–42% and incident light use efficiency (LUEinc: plant dry weight per unit of incident PAR, 400–700 nm) increased by 46–77% by adding FR; the largest FR effects were observed at the lowest planting density. Intercepted light use efficiency (LUEint: plant dry weight per unit of intercepted PAR) increased by adding FR (8–23%). Neither specific leaf area nor net leaf photosynthetic rate was influenced by FR. We conclude that supplemental FR increased plant biomass production mainly by faster leaf area expansion, which increased light interception. The effects of FR on plant dry weight are stronger at low than at high planting density. Additionally, an increased LUEint may contribute to the increased biomass production.

Yields and Nitrogenous Fertiliser Use Efficiency Responses of Clonal Tea (Camellia Sinensis) to Locations of Production

2017 ◽  
Vol 13 (01-02) ◽  
Author(s):  
Karl W. Nyabundi ◽  
P. Okinda Owuor ◽  
Godfrey W. Netondo ◽  
John K. Bore
Keyword(s):  
Nitrogen Availability ◽  
Management Practices ◽  
Nitrogen Fertiliser ◽  
Application Rates ◽  
Use Efficiency ◽  
Fertiliser Application ◽  
Fertiliser Use ◽  
Yield Responses ◽  
Nitrogen Rates ◽  
Nitrogen Contents

Tea husbandry practices in Kenya are uniform despite variations in responses to agronomic inputs with locations. Nitrogen availability is the most limiting tea/crop growth factor. However, tea yields vary with region of production even with the same cultivar, suggesting responses to nitrogen fertiliser and nitrogen utilisation may vary with locations. Nitrogen use efficiency (NUE) of clone TRFK 6/8 was investigated across three different locations/environments in western Kenya. Yields responded significantly (pd”0.05) to nitrogen fertiliser rates, but the responses varied with location of production. The responses to nitrogen rates were significantly lower (pd”0.05) in Timbilil than in Arroket and Changoi. This suggests that optimal nitrogenous fertiliser application rates should vary with locations. Nitrogen application rates between 75- 300Kg N did not cause significant variation in harvestable shoots nitrogen contents. However, there were large differences in the amounts of nitrogen removed with crop. The NUE of tea decreased as nitrogen fertiliser rates increased and was low in areas where yield responses were low. Such areas need low nitrogen fertiliser application rates to justify return on investment. Quantity of nitrogen removed with crop followed same pattern. On replacement basis, nitrogen removed with crop did not exceed the recommended rate of application (150 kg N/ha/year) at any location or nitrogen rate. Shoot nitrogen contents suggest that soil applied nitrogen may not be responsible for locational variations in yield realisation. Results demonstrate that fertiliser management practices, especially nitrogen rates need to be location specific.

Assessment of Canopy Structure, Light Interception, and Light-use Efficiency of First Year Regrowth of Shrub Willow (Salix sp.)

2008 ◽  
Vol 1 (3-4) ◽  
pp. 229-238 ◽  
Author(s):  
Pradeep J. Tharakan ◽  
Timothy A. Volk ◽  
Christopher A. Nowak ◽  
Godfrey J. Ofezu
Keyword(s):  
Canopy Structure ◽  
Light Interception ◽  
First Year ◽  
Light Use Efficiency ◽  
Shrub Willow ◽  
Use Efficiency ◽  
Structure Light
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