Total leaf area of papaya trees estimated by a nondestructive method

Posse, Robson Prucoli; Sousa, Elias Fernandes de; Bernardo, Salassier; Pereira, Messias Gonzaga; Gottardo, Romildo Domingos

doi:10.1590/s0103-90162009000400005

Cited by 15 publications

(9 citation statements)

References 5 publications

(10 reference statements)

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“…The plants were harvested 56 days after transplantation (DAT). At that time, plant height (from the plant lap up to the apex of the last developed leaf), the total number of leaves per plant, an indirect measure of chlorophyll content from reading the relative chlorophyll index (RCI) in ten leaves per experimental unit using a Chlorophyll Content Meter from OPTI-Sciences Ò model CCM-200 (Opti-Sciences, Tyngsboro, MA, USA), (Richardson et al, 2002), the leaf area with an LI-3100 Area Meter (LI-COR Inc., Lincoln, NE, USA) (Posse et al, 2009), the rate of net photosynthesis, and stomata conductance in two leaves per experimental unit using an open system portable infrared gas analyser (IRGA) model LICOR 6400. The measurements were made between 8 am and 3 pm in totally extended leaves under good phytosanitary conditions.…”

Section: Methodsmentioning

confidence: 99%

Macronutrient omission and the development and nutritional status of basil in nutritive solution

Borges

Flores

Almeida

et al. 2016

Journal of Plant Nutrition

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The correct nutrition of basil (Ocinum basilicum L.) is important to increase its production and quality; however, few papers have deal with this subject. The aim of this work was to evaluate the effects of omission of individual macronutrients on the growth and nutritional status of basil cultivated in nutritive solution. The treatments consisted of nutrient solutions with nitrogen, phosphorus, potassium, calcium, magnesium or sulfur (N, P, K, Ca, Mg, or S) omissions and a complete solution treatment. The plants were cultivated in 8 L plant pots. Plant height, number of leaves per plant, leaf area, relative chlorophyll index, net photosynthesis rate, stomatal conductance, plant dry matter, concentration levels of macronutrients in the aerial part and root system, and nutritional disorders were all evaluated. Nutrient omission was a limiting factor for plant development, substantially reducing its growth. There was also a considerable decrease in nutrient accumulation when compared to the control treatment.

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Section: Methodsmentioning

confidence: 99%

Macronutrient omission and the development and nutritional status of basil in nutritive solution

Borges

Flores

Almeida

et al. 2016

Journal of Plant Nutrition

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“…developed a model for papaya with the log relationship from a single measurement of the central vein, with an r 2 of 0.898 for four cultivars grown in Brazil. When a single cultivar is evaluated (Posse et al, 2009), the main midrib length and estimated leaf area have a higher correlation coefficient (r 2 = 0.99); an approach to estimating the total leaf area of a papaya plant using the bottom two leaves was presented. The slope and the intercept were similar among the lines evaluated Posse et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

Papaya (Carica papaya L.) Leaf Area Estimation and Single-leaf Net Photosynthetic CO2 Assimilation Rate Following Leaf Defoliation and Fruit Thinning

Zhou¹,

Reyes²,

Paull³

2020

horts

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Papaya (Carica papaya L.) leaves are large, up to 70 cm wide, and frequently deeply lobed, with seven to 13 major veins. The scan width of current handheld digital leaf area instruments is generally less than 15 cm. A rapid method is needed to estimate the total leaf area of a plant in the field with leaves at different stages of growth from the apex. The length of the main and side veins of papaya leaves can be used to estimate the area of a single leaf and the total leaf area of the plant. The relationship between main vein lengths and total leaf area was determined for mature leaves from the cultivars Sunset, Line-8, and Kapoho. A simple relationship exists between leaf area and the length of the two main side midribs (L3 and L4): Leaf area (cm2) = −2280 + 87.7*L3 + 55.6*L4 (P > F = 0.0001; r2 = 0.969), explaining ≈94% of the variation between estimated leaf area and leaf area. The most recently matured leaf is the third or fourth discernable leaf from the apex, with a positive net photosynthetic CO2 assimilation rate and an average area of 2331 cm2 that could fix up to 1.6 g carbon per 10-hour day under full sun. The rate of photosynthesis declined with leaf age, and the overall net photosynthetic CO2 assimilation rate of the plant can be predicted. Following 80% leaf defoliation of the plant, the net photosynthetic CO2 assimilation rate of the most recently matured leaf increased 30% to 50% on days 11 and 19 after treatment when the photosynthetic active radiation (PAR) was approximately half of that on day 15 under full sun when no difference in net photosynthetic CO2 assimilation rate was seen. Fruit removal did not affect the net photosynthetic CO2 assimilation rate. Papaya adjusts its single-leaf net photosynthetic CO2 assimilation rate under lower light levels to meet plant growth and fruit sink demand.

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“…Leaf area estimation by mathematical equations have been used with high precision, being a simple, rapid and non-destructive method that has became important to evaluate plant growth in field conditions (Bianco et al 2007a,b). Regression equations, relating measured leaf area with linear dimensions of leaves, have been used successfully to estimate leaf area of crops like strawberry (Strik and Proctor 1985, Pires et al 1999), vine (Pedro Júnior et al 1986, corn (Pereira 1987), squash (Silva et al 1998), garlic (Portela 1999), bean (Bhatt andChanda 2003, Queiroga et al 2003), coconut (Souza et al 2005), mango (Araújo et al 2005), cotton (Monteiro et al 2005, Alves et al 2009, cherry (Cittadini and Peri 2006), potato (Busato et al 2009), papaya (Posse et al 2009), among others. In this sense, there is no information with respect of an equation to estimate alfalfa (Medicago sativa) leaf area, perennial leguminous cropped as an important forage in Brazil (Favero et al 2008, Perez and Dall'Agnol 2009).…”

Section: Introductionmentioning

confidence: 99%

Determination of alfalfa leaf area by non-destructive method

Bianco¹,

Carvalho²,

Bianco³

2011

Commun. Plant Sci.

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The knowledge of plant leaf area is important to evaluate the vegetal growth. The objective of this research was to determine a mathematical equation to estimate successfully alfalfa (Medicago sativa) leaf area by measuring linear dimensions of the leaf blade of the plant leaflets. The leaves were collected from cultivar 'Crioula' cropped at field conditions in Jaboticabal, SP, Brazil. The leaflets length, width and leaf blade area were determined electronically. Linear, geometric and exponential equations were tested, considering the length and width separately and the length × width relation. The lateral leaflets showed similar dimensions and they were different to the central leaflet. So, it was opted to analyze the lateral leaflets together. All equations described satisfactorily the alfalfa leaf area, but it was opted for the linear equation passing through the origin due to its better practical application, showing high significance and normal distribution of residuals. This equation was validated with coefficient of correlation of 0.96, showing high significance (P < 0.01). The alfalfa leaf area can be estimated by the equation LA = 0,691156 × LWct + 0,3652754 × LWlt, where LWct is the central leaflet length × width and LWlt is the sum of the left and right lateral leaflets length × width.

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Total leaf area of papaya trees estimated by a nondestructive method

Cited by 15 publications

References 5 publications

Macronutrient omission and the development and nutritional status of basil in nutritive solution

Macronutrient omission and the development and nutritional status of basil in nutritive solution

Papaya (Carica papaya L.) Leaf Area Estimation and Single-leaf Net Photosynthetic CO2 Assimilation Rate Following Leaf Defoliation and Fruit Thinning

Determination of alfalfa leaf area by non-destructive method

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