Estimating Leaf Area for ‘Kakea’ and ‘Keaau’ Macadamia

Kobayashi, Kent D.; Ueunten, Gary R.

doi:10.21273/hortsci.19.3.413

horts

1984

DOI: 10.21273/hortsci.19.3.413

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Estimating Leaf Area for ‘Kakea’ and ‘Keaau’ Macadamia

Kent D. Kobayashi

Gary R. Ueunten

Abstract: Leaf areas of Macadamia integrifolia Maiden & Betche cvs. Kakea and Keaau were estimated by equations involving linear dimensions length and width in second degree polynomials. The equations accurately estimated leaf area at 2 locations for each cultivar.

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Cited by 3 publications

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Effects of Elevated Carbon Dioxide on Estimation of Leaf Area and Leaf Dry Weight of Soybean

Leadley

Reynolds

1988

American J of Botany

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The objectives of this study were to determine the effects of elevated CO2 on relationships between leaf area (A) and linear leaf dimensions (length [L] and width [W]) and leaf dry weight (M) in soybeans (Glycine max (L.) Merr. cv. Bragg). Based on dimensional measurements made on trifoliolates 1–6 for plants grown under three CO2 levels (348, 502 and 645 μl l−‐1), the best predictor for both trifoliolate leaf area and for fully expanded central leaflets of the trifoliolates was an equation of the form A = bo + b1L·W; these relationships were unaffected by CO2, although there was a small effect of leaf position. For expanding central leaflets of the fifth trifoliolate, no CO2, leaf size (age) or CO2 × leaf size effect was found. Specific leaf weight (i.e., M/A) was significantly affected by CO2, increasing with increasing CO2. Hence, trifoliolate dry weight can be nondestructively estimated from trifoliolate area using the equation M = 0.097 + (6.71 × 10−‐3 + 1.04 × 10−‐6[CO2])A, where [CO2] is mean daytime CO2 concentration of the growth environment.

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Effects of Elevated Carbon Dioxide on Estimation of Leaf Area and Leaf Dry Weight of Soybean

Leadley

Reynolds

1988

American J of Botany

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A simple method for non-destructive estimation of total shoot leaf area in tree fruit crops

Spann

Heerema

2010

Scientia Horticulturae

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Investigating tree and fruit growth through functional–structural modelling: implications of carbon autonomy at different scales

Auzmendi

Hanan

2020

Annals of Botany

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Abstract Background and Aims Many experimental studies assume that some topological units are autonomous with regard to carbon because it is convenient. Some plant models simulate carbon allocation, employing complex approaches that require calibration and fitted parameters. For whole-tree canopy simulations, simpler carbon allocation models can provide useful insights. Methods We propose a new method for simulating carbon allocation in the whole tree canopy considering various scales of carbon autonomy, i.e. branchlets, branches, limbs, and no autonomy. This method was implemented in a functional–structural plant model of growth of individual organs for studying macadamia tree growth during one growing season. Key Results This model allows the simulation of various scales of carbon autonomy in a simple tree canopy, showing organ within-tree variability according to the scale of autonomy. Using a real tree canopy, we observed differences in growth variability within the tree and in tree growth, with several scales of carbon autonomy. The simulations that assumed autonomy at branch scale, i.e. 2-year-old wood, showed the most realistic results. Conclusions Simulations using this model were employed to investigate and explain aspects of differences in carbon autonomy between trees, organ growth variability, competition between shoot and fruit growth, and time of autonomy.

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Estimating Leaf Area for ‘Kakea’ and ‘Keaau’ Macadamia

Abstract: Leaf areas of Macadamia integrifolia Maiden & Betche cvs. Kakea and Keaau were estimated by equations involving linear dimensions length and width in second degree polynomials. The equations accurately estimated leaf area at 2 locations for each cultivar.

Cited by 3 publications

References 2 publications

Effects of Elevated Carbon Dioxide on Estimation of Leaf Area and Leaf Dry Weight of Soybean

Effects of Elevated Carbon Dioxide on Estimation of Leaf Area and Leaf Dry Weight of Soybean

A simple method for non-destructive estimation of total shoot leaf area in tree fruit crops

Investigating tree and fruit growth through functional–structural modelling: implications of carbon autonomy at different scales

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