A Generalized Linear Model to Predict the Growth of Potted Seedlings of Satsuma Mandarin (&lt;i&gt;Citrus unshiu&lt;/i&gt; Marcow.) under Different Initial Plant Conditions, Environmental Conditions, and Pot Size

Yano, Taku; Morisaki, Akiyoshi; Ito, Shun; Kitano, Masaharu

doi:10.2503/hortj.okd-112

Cited by 3 publications

(2 citation statements)

References 37 publications

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“…Multiple studies indicate that the size, volume, shape, depth, color, and even roughness of a container's internal walls affect the growth characteristics of plants, particularly the quality of their root system (Lemaire et al, 2005;Lemaire and Papin, 1989;Liptay and Edwards, 1994;Rune, 2003;South et al, 2005;Spencer, 1972;Yano et al, 2018).…”

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Container Design Affects Shoot and Root Growth of Vegetable Plant

Gallegos¹,

Álvaro²,

Urrestarazu³

2020

horts

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The response of root growth in containers has been studied in recent decades. The objective was to evaluate the effect of four types of containers on root and shoot growth. The containers were two shapes, round and square, and in some containers, internal vertical walls (IVWs) were placed that increased the internal container surface area with two substrates: perlite and coir fiber. Seedlings of cucumber, pepper, and tomato were transplanted. Two experiments were performed: vegetative growth and drought stress by partial decapitation and a period without fertigation. After decapitation, preexisting and new leaf area, dry biomass or the leaves, and stem were measured. The results revealed that the type of container had no effect, nor were there significant differences between substrates. The containers with IVWs exhibited an increase in biomass and the root surface. The total contact surface with the substrate of the four container types was closely related to the recorded plant growth. Thus, IVWs not only decrease mechanical problems of roots by preventing spiralling but also favor the production of biomass in vegetable plants and substantially increase the root, enabling the plants to manage water deficit and potentially improve posttransplant stress.

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confidence: 99%

Container Design Affects Shoot and Root Growth of Vegetable Plant

Gallegos¹,

Álvaro²,

Urrestarazu³

2020

horts

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“…In this study, to produce high yields with low-labor costs required for summer harvest cropping types of greenhouse-grown satsumas, the efficiency of shoot management was optimized. This efficiency was attempted although greenhouse-grown citrus fruits are known to have more active vegetative growth ( Yano et al, 2018aYano et al, , 2018b and excessive tree vigor ( Tachibana and Yahata, 2007) than citrus grown in open-field conditions. To account for and regulate tree vigor, a high-density trellis training system was tested that involved multiple leadersi.e., three to four leaders per tree ( Micheli, 2014, 2015).…”

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confidence: 99%

Characterization of canopy structure for high-yield performance of greenhouse-grown satsuma mandarins using direct measurements and indirect estimations

Yano

Yasutake

Kiyosue

2022

J. Agric. Meteorol.

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Under assuming that high-yield canopy structure would be simply explained by a given index, orchard productivity of greenhouse-grown early-flowering satsuma mandarins "Miyagawa wase" was assessed using conventional modified-open-center-training and trellis-training methods. This was done by using universal indices that assist with determining yield in relation to canopy structure. Leaf area index was the optimum index for determining fruit yield. Empirical extinction coefficients showed negative linear trends with yield. Either plant area index, estimated by using a plant canopy analyzer, and crown cover showed poor correlation with fruit yield. To effectively predict yield from leaf area index, a direct measurement is recommended rather than an indirect optical method. Trellis-trained trees were superior to modified-open-center-trained trees. This is because trellis-trained trees had higher fruit productivity up untill 10 yeas old, and because 15-year-olds had better canopy light distrubution patterns when compared with modified open-center-trained trees. Based on the costs associated with planting seedlings and the labor-efficiency due to width of free alley, trellis-training 2.2 m × 1.0 m plots was optimum for planting. In this study, even when accounting for the measurement error of woody elements, empirical extinction coefficients was a good index to base yield productivity. This is because this index directly represents vertical canopy light distribution. Additionally, the clumping index, calculated by using direct measurement and indirect optical method, was suggested to relate to canopy light distribution, however, further study must be essential.

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Comparison of Frequentist and Bayesian Generalized Linear Models for Analyzing the Effects of Fungicide Treatments on the Growth and Mortality of Piper Nigrum

Le¹,

Nguyễn

Richter

et al. 2021

Agronomy

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Foot rot disease poses a devastating threat to pepper agriculture. In Vietnam, conventionally, fungicides are the control methods used against the disease. However, the practical effectiveness of fungicide treatment has yet to be quantitatively assessed. To fill this gap a three-factorial experiment was conducted, the factors of which were fungicide application, soil type, and infection pathway, with plant mortality and plant growth as the target variables. Two of the most common fungicides were chosen, including Agrifos 400 (potassium phosphonate) and Aliette 800WG (fosetyl-Al). The two fungicides were used in multiple treatment plans, with soil drenching selected as the means of controlling foot rot disease on red basalt soil and red basalt soil added with organic matter in a greenhouse experiment. Three-month-old pepper (Piper nigrum) plants were treated with Agrifos (application interval of 10 and 20 days), Aliette (application interval of 30 and 60 days), and a combination of both fungicides at half doses. Pepper plants were infected with the fungus Pythium spp. from soil or by direct inoculation. To assess the effect of fungicides on foot rot mortality and the growth of pepper plants, multiple generalized linear models were set up using frequentist and Bayesian approaches. Generally, both procedures suggest the same conclusions for model selection in terms of the Akaike information criterion (AIC) and the deviance information criterion (DIC). Fungicide type was found to be the main factor that affected the survival of plants. Most of the treatments (except Aliette, with an interval of 60 days) effectively reduced the mortality. The usage of fungicides affected the growth of plants in interaction with soil types. Aliette suppressed the growth of plants, especially on red soil, while Agrifos had no effect on the growth of pepper plants. The combined application of Agrifos and Aliette with half doses proves to be a promising solution for balancing cost and effectiveness in protecting plants against foot rot pathogens without affecting their growth. In our case, under the inhomogeneity of variance and unbalanced samples, the Bayesian inference appeared to be the most useful because of its flexibility in terms of model structure.

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A Generalized Linear Model to Predict the Growth of Potted Seedlings of Satsuma Mandarin (<i>Citrus unshiu</i> Marcow.) under Different Initial Plant Conditions, Environmental Conditions, and Pot Size

Cited by 3 publications

References 37 publications

Container Design Affects Shoot and Root Growth of Vegetable Plant

Container Design Affects Shoot and Root Growth of Vegetable Plant

Characterization of canopy structure for high-yield performance of greenhouse-grown satsuma mandarins using direct measurements and indirect estimations

Comparison of Frequentist and Bayesian Generalized Linear Models for Analyzing the Effects of Fungicide Treatments on the Growth and Mortality of Piper Nigrum

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