Viability equation to determine the longevity of fungicide-treated seeds of wheat stored in a conventional warehouse

Marcondes, Maria Celeste; Andreoli, C.; Miglioranza, Édison

doi:10.4025/actasciagron.v33i3.6455

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…Pre-storage seed treatment shows up like an alternative to the adoption of technologies on wheat seed, but also, in some cases, it can harm the seed deterioration rate (Marcondes et al, 2011). In this regard, the quality of treated seeds has been evaluated for different crops, with positive or no responses obtained for different seed treatments.…”

Section: Introductionmentioning

confidence: 99%

Physiological performance of wheat seeds treated with micronutrients and protection products during storage

et al. 2017

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-Seeds with high quality are one of the important factors to consider in the crops establishment on field. Therefore, the physical and physiological quality of wheat seeds treated with mixes of micronutrients including zinc and protective products were aimed. The wheat seeds were analyzed in a factorial scheme 5x3x4, with five storage time: 0, 60, 120, 180 and 240 days; three micronutrients: micronutrients 1 (1% Mn; 0.1% Mo; 10% Zn); micronutrients 2 (0.3% B; 0.3% Co; 3% Zn) and no micronutrients, and four protective products: untreated seeds, polymer (Colorseed He), fungicide carboxin + thiram (Vitavax® Thiram 200 SC) + insecticide thiamethoxam (Cruiser® 350 FS) and polymer + fungicide + insecticide. After treatment, the seeds were stored under uncontrolled conditions for 240 days and at intervals of 60 days, the germination, accelerated aging and moisture content were determined. Wheat seeds untreated and treated with polymer have the best physiological performance during storage, regardless micronutrients treatments. The wheat seeds treated with carboxin + thiram + thiamethoxam and polymer + carboxin + thiram + thiamethoxam can be storage up to 120 days, under uncontrolled conditions, regardless micronutrients treatments. The seed treatment does not alter the moisture content of wheat seeds.

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Section: Introductionmentioning

confidence: 99%

Physiological performance of wheat seeds treated with micronutrients and protection products during storage

et al. 2017

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“…Lowest deterioration rate for variety BG was observed in Kundasale and for variety KN in Gannoruwa. Although findings of behaviour on ambient environment conditions on commercial seeds are scarce, Marcondes et al, (2011), used this simplified model to estimate germination change and viability loss during the conventional storage of fungicide treated and untreated wheat seeds which gives high accuracy. Tgβ, that is seed deterioration rate, was high in the conventional storage conditions where temperature was in the higher ends.…”

Section: Seed Germination Under Ambient Environmental Storage Conditionsmentioning

confidence: 99%

Quality Deterioration of Commercial Bean (Phaseolus vulgaris) Seeds Stored under Contrasting Environmental Conditions in Sri Lanka

Ariyarathna

Weerasena

Beneragama

2020

Int J Appl Sci Biotechnol

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Bean is a popular vegetable grown in most parts of Sri Lanka. Farmers and home gardeners purchase seeds in packeted form retail outlets. However, quality problems are frequently reported, especially on low field germination. Quality parameters namely, percentage germination, field emergence, seedling length, vigour index and chlorophyll fluorescence analysis were used to determine the effect of different storage environmental conditions on seed longevity of two bean varieties during a two-year storage period, 2016 to 2018. Seeds in triple-laminated packets stored in four contrasting conditions; low temperature storage conditions (Tem. 5oC, 65% RH); three geo-environmental conditions namely, Gannoruwa (mid country wet zone), Kundasale (mid country intermediate zone), and Mahailuppallama (low country dry zone) showed varied behavior in seed quality parameters respective of the variety. It was apparent that germination test alone does not represent the full potential of field emergence. Results of the present study revealed that when field emergence and vigour are also taken in to account, both varieties of bean seeds can be stored under ambient conditions at Gannoruwa, Kundasale or MahaIlluppallama for a maximum period of 12 months, without compromising the seed quality. The seeds stored under low temperature conditions (i.e. 5 °C), maintained the seed germination over 75% for a period of 24 months.

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“…The Probit model is given by the inverse function of the cumulative distribution curve of the probability of survival of the seeds. Ellis and Roberts (1981) proposed this model to define the P50 in orthodox seeds, and since then, the Probit model has been proposed to predict longevity in seeds of different species and in different storage conditions (Ellis et al, 1990; Demir and Mavi, 2003; Obunyali et al, 2008; Marcondes et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Probit or Logit? Which is the better model to predict the longevity of seeds?

et al. 2020

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AbstractThe prediction of seed longevity (P50) is traditionally performed by the use of the Probit model. However, due to the fact that the survival data are of binary origin (0,1), the fit of the model can be compromised by the non-normality of the residues. Consequently, this leads to prediction losses, despite the data being partially smoothed by Probit and Logit models. A possibility to reduce the effect of non-normality of the data would be to apply the principles of the central limit theorem, which states that non-normal residues tend to be normal as the n sample is increased. The Logit and Probit models differ in their normal and logistic distribution. Therefore, we developed a new estimation procedure by using a small increase of the n sample and tested it in the Probit and Logit functions to improve the prediction of P50. The results showed that the calculation of P50 by increasing the n samples from 4 to 6 replicates improved the index of correctness of the prediction. The Logit model presented better performance when compared with the Probit model, indicating that the estimation of P50 is more adequate when the adjustment of the data is performed by the Logit function.

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Viability equation to determine the longevity of fungicide-treated seeds of wheat stored in a conventional warehouse

Cited by 5 publications

References 16 publications

Physiological performance of wheat seeds treated with micronutrients and protection products during storage

Physiological performance of wheat seeds treated with micronutrients and protection products during storage

Quality Deterioration of Commercial Bean (Phaseolus vulgaris) Seeds Stored under Contrasting Environmental Conditions in Sri Lanka

Probit or Logit? Which is the better model to predict the longevity of seeds?

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