A Rapid Method of Leaf Area Determination

The length‐width method for estimating leaf area has been evaluated with traditional Indica and Japonica rices (Oryza saliva L.); the leaves of modern semidwarf rices, however, are quite different in shape. We therefore evaluated the length‐width method using 11,356 leaves taken from 2 semidwarf varieties grown under 3 fertilizer levels for 2 crop seasons. Measurement of length alone was unsatisfactory. The use of length times maximum width, however, was found satisfactory under most test conditions except at 30 days after transplanting and at maturity. In other cases, leaf area could be determined from K(L ✕ W), where L is the leaf length, W is the maximum width of the leaf, and K is 0.73 for dry‐season crops and 0.75 for wet‐season crops. This method is unbiased; estimates should have no more than 5% error.

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“…), sugar cane (Saccharum officinarum), and wheat (Triticum aestivum L.). Lal and Subba Rao (1951) recommended the formula…”

mentioning

confidence: 99%

Length‐Width Method for Estimating Leaf Area of Rice¹

Palaniswamy¹,

Gomez

1974

Agronomy Journal

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“…The experimental design was completely randomized with 15 repetitions per treatment. At the end of the crop cycle, they recorded the following data: height of plants; the number of stems; leaf area index (IAF) [20], fresh weight (PF), dry (PS) and percentage of dry matter (% DM) of stems, leaves, roots, propagules, tubers and whole plant; the number of tubers per plant; average weight and yield of tubers. With the data of dry weight (PS) and fresh weight (FP) the% of dry matter (% DM = PS x 100 / FP) was calculated, both for stems, tubers, roots and other parts of the plant.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of the Effect of Azospirillum brasilense and Mycorrhizal Fungi of the Soil in Yacon Grown in a Greenhouse

Gabriela

Andrada

Eleodoro

et al. 2021

OJAR

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In order to evaluate the effect of Azospirillum brasilense and mycorrhizal fungi in the soil on the nutrition of the yacon crop (Smallanthus sonchifolius [(Poeppig & Endlicher) H. Robinson]), determinations of agronomic parameters and the health status of the plants were carried out, under greenhouse conditions. The tests were carried out at the time of the implantation of the culture: the propagules were inoculated with A. brasilense and with native mycorrhizal fungi, generating four treatments, including the control and the co-inoculation of the consortium of the microorganisms under study (T0: control or control without inoculation; T1: inoculation with native A. brasilense; T2: inoculation with native mycorrhizal fungi and T3: joint inoculation with A. brasilense and native mycorrhizal fungi. The results indicate that co-inoculation with A. brasilense and native mycorrhizal fungi increased plant growth in height, leaf area, biomass, dry matter and yields significantly in greenhouse production. It was determined that the application of the selected microorganisms has a plant growth promoting effect, increasing growth and productivity, greenhouse grown yacón.

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“…The recorded criteria were the following: plant height, estimated as the length of the main stem in cm from soil surface to the base of its spike, flag leaf area; calculated using the formula of Lal and Subba Rao (1951) as follows: leaf area = 0.76 leaf length × leaf broadest width, number of tillers, fresh weight, dry weight, leaf relative water content; measured using the method of Yamasaki and Dillenburg (1999), peduncle length; measured as the length in cm of the top internode of the main stem at maturity, spike length; measured as the average length of five spikes, number of spikes per plant; estimated as the average number of productive tillers per plant, thousandkernel weight (g), biological yield, measured as total aerial biomass production (g), determined at harvest by weighing all plant parts excluding the root.…”

Section: Determination Of Growth and Yield Criteriamentioning

confidence: 99%

Physiological and Biochemical Responses to Heat Stress on Barley Seedlings and Their Impact on Growth and Yield

2016

Egypt. J. Bot.

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HE PRESENT study was carried out to investigate the effect of two … temperature degrees (30&40°C) on physiological and biochemical aspects of barley seedlings and their impact on growth and yield. Plant height, number of tillers, fresh weight, dry weight, flag leaf area were generally reduced following exposure to heat stress ranging between 2 and 8 hours., while relative water content was increased indicating attempts by plant to resist temperature elevation. The contents of chlorophyll a and chlorophyll b decreased significantly in leaves exposed to all treatments of heat stress while carotenoids decreased as the stress duration was prolonged. Correlation was evident between growth, some yield parameters (peduncle length, biological yield, spike length, number of spike per plant, kernels weight) and yield index. Changes in SDS protein profiles indicated the occurrence of a number of biochemical responses; some of them were positively associated with heat stress, while the others were negatively associated with heat stress.

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A Rapid Method of Leaf Area Determination

Cited by 18 publications

References 7 publications

Length‐Width Method for Estimating Leaf Area of Rice¹

Length‐Width Method for Estimating Leaf Area of Rice¹

Evaluation of the Effect of Azospirillum brasilense and Mycorrhizal Fungi of the Soil in Yacon Grown in a Greenhouse

Physiological and Biochemical Responses to Heat Stress on Barley Seedlings and Their Impact on Growth and Yield

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A Rapid Method of Leaf Area Determination

Cited by 18 publications

References 7 publications

Length‐Width Method for Estimating Leaf Area of Rice1

Length‐Width Method for Estimating Leaf Area of Rice1

Evaluation of the Effect of Azospirillum brasilense and Mycorrhizal Fungi of the Soil in Yacon Grown in a Greenhouse

Physiological and Biochemical Responses to Heat Stress on Barley Seedlings and Their Impact on Growth and Yield

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Product

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Length‐Width Method for Estimating Leaf Area of Rice¹

Length‐Width Method for Estimating Leaf Area of Rice¹