scholarly journals EFFECTS OF WATER MANAGEMENT AND COMPOSTED SEWAGE SLUDGE SUBSTRATES ON THE GROWTH AND QUALITY OF CLONAL EUCALYPTUS SEEDLINGS

FLORESTA ◽  
2020 ◽  
Vol 50 (2) ◽  
pp. 1307 ◽  
Author(s):  
Mônica Moreno Gabira ◽  
Richardson Barbosa Gomes Da Silva ◽  
Caroline De Moura D’Andréa Mateus ◽  
Roberto Lyra Villas Boas ◽  
Magali Ribeiro Da Silva
Keyword(s):  
Water Management ◽  
Sewage Sludge ◽  
Sugarcane Bagasse ◽  
Quality Index ◽  
Dry Mass ◽  
Irrigation Depth ◽  
Composted Sewage Sludge ◽  
Eucalyptus Bark ◽  
Dickson Quality Index

This study aimed to evaluate the effect of substrates made of composted sewage sludge and irrigation depths on the growth and quality of E. grandis x E. urophylla cuttings to optimize water management for each substrate. The substrates were obtained from sewage sludge composted with sugarcane bagasse or Eucalyptus bark, namely: composted sewage sludge with sugarcane bagasse (1:3 v:v); sewage sludge composted with Eucalyptus bark (1:3 v:v) and a mixture of both substrates in a volumetric proportion 2:1 (v:v). Commercial substrate composed of Sphagnum peat, vermiculite and rice husk (3:1:1 v:v: v) was used as a control. The irrigation depths tested were 11, 14 and 17 mm, applied in two daily applications. The substrates were physically and chemically characterized and height, stem diameter, shoot, root and total dry mass, Dickson quality index and root system conformation were measured to determine the growth and quality of seedlings. The substrates obtained through the composting of sewage sludge with sugarcane bagasse or Eucalyptus bark are fit for producing Eucalyptus cuttings, however, the water specificity of each substrate must be considered. Although an 11mm irrigation depth is indicted for the mixture of both substrates (2:1 v:v), a 17mm irrigation depth is needed for the sewage sludge composted with sugarcane bagasse (1:3 v:v) substrate.

scholarly journals SEWAGE SLUDGE COMPOST ASSOCIATED TO FREQUENCY OF IRRIGATION FOR Peltophorum dubium (Sprengel) Taubert SEEDLINGS PRODUCTION

FLORESTA ◽  
2020 ◽  
Vol 50 (2) ◽  
pp. 1389
Author(s):  
Laura Oliveira Cleto da Silva ◽  
Aline Cássia Da Fonseca ◽  
Deicy Carolina Lozano Sivisaca ◽  
Magali Ribeiro da Silva ◽  
Roberto Lyra Villas Boas ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Quality Index ◽  
Color Index ◽  
Environmental Problem ◽  
Dry Mass ◽  
Diameter Ratio ◽  
Promising Alternative ◽  
Leaf Dry Mass ◽  
Eucalyptus Bark ◽  
Dickson Quality Index

Inappropriate disposal of sewage sludge has become an environmental problem. In some Brazilian states, such as São Paulo, in natura sewage sludge use is practically prohibited due to restrictive requirements by CONAMA Resolution No. 375/2006. Therefore, a very promising alternative to reuse this residue is to compost it with other materials and use it as a substrate in the production of seedlings. The objective of this study was to evaluate the development of the seedlings of Peltophorum dubium in compost with sewage sludge, to determine which frequency of irrigation would be more adequate according to the physical characteristics of each substrate, and if this would influence the morphological and nutritional variables of the seedlings. Two composts were produced: sewage sludge composted with sugarcane bagasse and sewage sludge composted with eucalyptus bark, both in 1: 1 proportion. Commercial substrate was used for control. This study was completely randomized in a 3x3 factorial design, which three substrates and three frequencies of irrigation were tested: two, three and four times per day. The evaluated parameters were: plant height, stem diameter ratio, shoot / root ratio, leaf dry mass, root dry mass, total dry mass, green color index, Dickson quality index (IQD), water loss through leaching and substrate water retain capacity. The best results were observed in the seedlings produced in sewage sludge compound with eucalyptus bark submitted to the frequencies of two or three times a day.

scholarly journals Matrix management interfers in yield and quality of cocoa seedlings

2018 ◽  
Vol 40 (3) ◽  
Author(s):  
Rafaela Alves Pereira ◽  
Gedeon Almeida Gomes Júnior ◽  
Eliandro Malta Rodrigues ◽  
George Andrade Sodré ◽  
Célio Kersul do Sacramento
Keyword(s):  
Quality Index ◽  
Quality Evaluation ◽  
Pearson Correlation ◽  
Dry Mass ◽  
Experimental Unit ◽  
Plant Management ◽  
Yield And Quality ◽  
Cocoa Seedlings ◽  
Dickson Quality Index

Abstract The influence of two managements on yield and quality of plagiotropic mini-cuttings of four cacao clones was evaluated. The design was completely randomized in a 4 x 2 factorial scheme with 4 clones x 2 mother plant management (apical pruning and bending), with 10 replicates and one plant as experimental unit. Seedlings used were propagated by rooting of semi-woody cuttings of plagiotropic branches and at seven months of age, two seedlings of each clone were transplanted to 12 L pots filled with organomineral substrate. After transplantation, the apex of one of the plants was cut based on the count of the first six leaves from the apex. For bending, stems were folded and horizontally fixed. The first collection of mini-cuttings was performed 30 days after transplantation and the others during the following seven months. The yield of mini-cuttings was estimated during collections and part was used for rooting and quality evaluation of seedlings. After 90 days, 10 mini-cuttings of each clone were evaluated for quality using the Dickson quality index (DQI). Another 10 rooted mini-cuttings were transplanted to 1.5 L polyethylene bags and kept in greenhouse for another 120 days until final quality evaluation at 210 days. Data were submitted to analysis of variance and Tukey test at 5% probability. Shapiro-Wilk normality test and Pearson correlation analysis were performed. bending was more efficient in the average production of mini-cuttings especially for BN 34 clone. The Dickson quality index was correlated with root dry mass, at both 90 and 210 days, and the bending technique was responsible for the best DQI. Variable height was not adequate to estimate the quality of cocoa seedlings.

scholarly journals Growth and quality of Brazilian pine tree seedlings as affected by container type and volume

2019 ◽  
Vol 25 (3) ◽  
pp. 276-286
Author(s):  
Leandro Marcolino Vieira ◽  
Erik Nunes Gomes ◽  
Theodore Aaron Brown ◽  
Valdeci Constantino ◽  
Flavio Zanette
Keyword(s):  
Quality Index ◽  
Nonwoven Fabric ◽  
Dry Mass ◽  
Tree Seedlings ◽  
Pine Tree ◽  
Plastic Bags ◽  
Collar Diameter ◽  
Root Collar ◽  
Dickson Quality Index

Abstract Araucaria angustifolia (Bert.) O. Kuntze (Araucariaceae), commonly known as araucaria and Brazilian pine tree, can be grown for their edible pine nuts (pinhões), medicinal properties, and ornamental purposes. The aim was to assess the shoot and root growth and the overall quality of A. angustifolia seedlings grown in containers with different sizes, shapes and composition. Seeds were sowed in five containers: I – 126cm3 polypropylene cone-tainers (small cone-tainers); II – 290cm3 cone-tainers (large cone-tainers); III – 879cm3 polyethylene black bags; IV- 275 cm3 nonwoven fabric (TNT) containers (small TNT container) and; 493 cm3 nonwoven fabric (TNT) containers (large TNT container). Seedlings were evaluated 210 days after sowing, regarding the following variables: aboveground height (cm), root collar diameter (mm), shoot dry mass (g), roots dry mass (g), total dry mass (g), leaf area (cm2), roots area (cm2), roots volume (cm3), sturdiness quotient, root-shoot ratio and Dickson quality index. Height was superior for seedlings grown in the plastic bags (27.6 cm) and the large TNT containers (27.02 cm) when compared to the small and large cone-tainers (21.75 and 21.78 cm, respectively). Plastic bags also presented greater values of root-collar diameter, shoots, roots and total biomass and Dickson Quality index. Small and large TNT containers promoted lower root area and volume when compared to large polyethylene cone-tainers, but allowed for the same or better aboveground growth. Taking all results analyzed together, the polyethylene black bag promoted better growth and quality of Brazilian pine tree seedlings in comparison to the other containers.

scholarly journals Growth and quality of SJ-02 cocoa seedlings (Theobroma cacao L.) under different irrigation depths and cultivation containers

2020 ◽  
pp. 1695-1700
Author(s):  
Vinicius de Souza Oliveira ◽  
Stefany Sampaio Silveira ◽  
Robson Prucoli Posse ◽  
Laís Gertrudes Fontana Silva ◽  
Valeria Pancieri Sallin ◽  
...  
Keyword(s):  
Theobroma Cacao ◽  
Quality Index ◽  
Dry Mass ◽  
Seedling Production ◽  
Randomized Design ◽  
Irrigation Depth ◽  
Completely Randomized Design ◽  
Theobroma Cacao L ◽  
Cocoa Seedlings

The study aimed to evaluate the growth and quality of SJ-02 cocoa seedlings under different irrigation depths and cultivation container sizes. The experiment was arranged as a completely randomized design, in a factorial scheme (4x3), where the first factor consisted of the application of four different irrigation depths (6, 10, 12 and 14 mm d-1) and the second one was composed of three different cultivation containers (small, medium and large). Twelve treatments were evaluated with eight repetitions, totaling 96 plants in the experimental field. At 74 days after sowing, the leaf area, stem diameter, plant height, dry mass of the aerial part, dry mass of the root system, total dry mass and Dickson's quality index of all seedlings were analyzed. The 10.32 mm d-1 irrigation depth and the medium and large cultivation containers provided the highest quality in seedling production, being the most suitable ones. However, there was no interaction between the factors

scholarly journals QUALIDADE MORFOLÓGICA DE MUDAS DE INGÁ SOB DIFERENTES MANEJOS HÍDRICOS

Irriga ◽  
2017 ◽  
Vol 22 (3) ◽  
pp. 420-429 ◽  
Author(s):  
Luiz Gustavo Martinelli Delgado ◽  
Richardson Barbosa Gomes da Silva ◽  
Magali Ribeiro Silva
Keyword(s):  
Water Management ◽  
Statistical Design ◽  
Dry Mass ◽  
Point Of View ◽  
Stem Diameter ◽  
Native Forest ◽  
System Quality ◽  
Quality Water ◽  
Irrigation Depth

QUALIDADE MORFOLÓGICA DE MUDAS DE INGÁ SOB DIFERENTES MANEJOS HÍDRICOS  LUIZ GUSTAVO MARTINELLI DELGADO¹; RICHARDSON BARBOSA GOMES DA SILVA² E MAGALI RIBEIRO DA SILVA¹ 1Departamento de Ciência Florestal, Faculdade de Ciências Agronômicas, UNESP - Universidade Estadual Paulista, Campus Botucatu, SP. CP 237, CEP 18610-307. E-mails: [email protected]; [email protected] Orígenes Lessa, ALEC – Associação Lençoense de Educação e Cultura,  Lençóis Paulista, SP. Rod. Osni Matheus, km 108. E-mail: [email protected]  1 RESUMO A melhoria no processo de produção de mudas florestais nativas se faz necessária devido ao aumento em sua procura, não só em quantidade, mas também em qualidade. O manejo hídrico, na maioria das vezes, é feito de forma empírica, resultando em produtividade aquém do potencial genético, além do favorecimento de doenças, desperdício de água, energia e nutrientes. O presente estudo teve por objetivos analisar os efeitos das lâminas e frequências de irrigação sobre o desenvolvimento e a qualidade das mudas de Inga vera, bem como determinar o manejo hídrico mais adequado do ponto de vista da eficiência do recurso hídrico. O experimento foi conduzido em viveiro localizado nas coordenadas 22º 51’ latitude S e 48º 26’ longitude O. O delineamento estatístico adotado foi inteiramente casualizado em esquema fatorial (3x2), constituído dos seguintes fatores: três lâminas (6, 10 e 14 mm) e duas frequências de irrigação (2 e 4 vezes ao dia). Cada tratamento foi constituído por 4 parcelas, compostas por 8 mudas úteis cada, totalizando 32 mudas por tratamento. Foram avaliadas as seguintes variáveis morfológicas: altura, diâmetro do colo, relação entre a altura e o diâmetro de colo, massa seca da parte aérea, radicular e total e qualidade do sistema radicular. O manejo hídrico utilizando a lâmina de 10 mm, dividida na frequência de irrigação duas vezes ao dia, produz maior desenvolvimento e qualidade nas mudas de Inga vera, além de utilizar, comparada à lâmina 14 mm, 29% menos água. Palavras - chave: viveiro, água na planta, irrigação  DELGADO, L. G. M.; SILVA, R. B. G. DA E SILVA, M. R. DAMORPHOLOGICAL QUALITY OF Inga vera SEEDLINGS UNDER DIFFERENT WATER MANAGEMENTS  2 ABSTRACTThe improvement in the production process of native forest seedlings is necessary due to the increase in their demand, not only in quantity, but also in quality. Water management is most often done empirically, resulting in productivity below the genetic potential, as well as favoring diseases and waste of water, energy and nutrients. This study aimed to analyze the effects of irrigation depths and frequencies on the development and quality of Inga vera seedlings and determine the most appropriate water management from the point of view of water resource efficiency. The experiment was conducted in a nursery in geographic coordinates 22º 51’ S and 48º 26’ W. The statistical design was factorial (3x2), completely randomized, and constituted by the following agents: three irrigation depths (6, 10 and 14 mm) and two irrigation frequencies (twice and four times a day). Each treatment had four replicates (trays), each one of them consisting of 8 useful seedlings, totaling 32 plants per treatment. The variable seedlings analyzed were the following: height, stem diameter; relation between height and stem diameter, shoot, root and total dry mass, and root system quality. The water management using the 10 mm irrigation depth, split two times a day, produces greater development and quality in the Inga vera seedlings, in addition using 29% less water compared to the 14 mm irrigation depth. Keywords: nursery, water in plant, irrigation 

scholarly journals SUBSTRATE VOLUMES AND APPLICATION OF PACLOBUTRAZOL FOR ORNAMENTAL PEPPER PRODUCTION

2019 ◽  
Vol 6 (3) ◽  
pp. 1-5
Author(s):  
Naine Parladore ◽  
Abimael Gomes da Silva ◽  
Edilson Costa ◽  
Flávio Ferreira da Silva Binotti ◽  
Laura Araújo Silva ◽  
...  
Keyword(s):  
Quality Index ◽  
Foliar Application ◽  
Dry Mass ◽  
Diameter Ratio ◽  
Stem Diameter ◽  
State University ◽  
Mato Grosso ◽  
Mato Grosso Do Sul ◽  
Dickson Quality Index

The objective was to evaluate the quality of ornamental pepper seedlings, cultivar Pyramid, in different substrate volumes, with foliar application of paclobutrazol (PBZ).The experiment was carried out at the Mato Grosso do Sul State University - UEMS, in Cassilândia - MS. The experimental design was completely randomized, in a 2 x 2 factorial scheme (growth container x foliar application of PBZ) with four replicates of 36 seedlings each. Plastic trays (cells with a volume of 50 mL) and polystyrene trays (Isopor®, 100 mL cells) were used as containers. The treatments were: polystyrene tray with PBZ application; polystyrene tray without PBZ application; plastic tray with PBZ application and plastic tray without the application of PBZ. Plant height, root length, stem diameter, shoot dry mass, root dry mass, total dry mass, height/stem diameter ratio (H/D), shoot/root ratio (S/R) and Dickson quality index were evaluated. Foliar application of paclobutrazol resulted in robust pepper seedlings with reduced size, suitable and desirable characteristics for ornamental purposes. The polystyrene trays with higher volume cells (100 mL) contributed to the higher quality of ornamental pepper seedlings.

scholarly journals Growth and Quality of Genotype PS-1319 Cacao Seedlings Produced Under Different Irrigation Depths

2019 ◽  
Vol 11 (16) ◽  
pp. 238
Author(s):  
Stefany Sampaio Silveira ◽  
Robson Prucoli Posse ◽  
Sophia Machado Ferreira da Silva ◽  
Vinicius de Souza Oliveira ◽  
Francielly Valani ◽  
...  
Keyword(s):  
Leaf Area ◽  
Quality Index ◽  
Aerial Part ◽  
Dry Mass ◽  
Federal Institute ◽  
Randomized Design ◽  
Northwestern Region ◽  
Cocoa Seedlings ◽  
Dickson Quality Index

Due to the lack of information on the water demand of cocoa seedlings, empirical techniques have been used in the supply of water to the seedlings, potentializing losses in their growth and development. In this context, the present study aimed to determine the optimal irrigation depth for a good development of the genotype PS-1319 cocoa seedlings. The study took place at the Federal Institute of Espírito Santo-Campus Itapina, located in the Colatina, a city situated in the northwestern region of the state of Espírito Santo, Brazil, in an experimental greenhouse of the campus, between October 20 and December 15, 2017. The experiment was conducted in a completely randomized design (CRD) using 20 seedlings of the genotype PS-1319 cacao per treatment. The treatments consisted of daily applications of six irrigation depths, corresponding to 4, 6, 8, 10, 12 and 14 mm d-1, being evaluated their effects on the morphological parameters (leaf area; dry mass of the aerial part, dry mass of the root system and total dry mass; height of the aerial part and stem diameter) and the quality (Dickson quality index). The applied depths interfered, both in the development and the quality of the seedlings, with quadratic adjustments for the leaf area, dry mass of the aerial part and total dry mass, diameter and for the Dickson quality index. The best responses to the studied parameters were provided by the 8.33 mm d-1 depth, which is recommended as an ideal for production of genotype PS-1319 cacao seedlings.

scholarly journals Resposta de Handroanthus heptaphyllus Mattos em diferentes volumes de substrato e adubação de base.

FLORESTA ◽  
2020 ◽  
Vol 50 (4) ◽  
pp. 1770
Author(s):  
Thaise Da Silva TONETTO ◽  
Maristela Machado Araujo ◽  
Álvaro Luís Pasquetti Berghetti ◽  
Márcio Carlos Navroski
Keyword(s):  
Controlled Release ◽  
Quality Index ◽  
Lower Cost ◽  
Dry Mass ◽  
High Dose ◽  
Native Forest ◽  
Forest Species ◽  
Definition Of ◽  
Appropriate Practices ◽  
Dickson Quality Index

Handroanthus heptaphyllus (Martius) Mattos response in different volumes of substrate and base fertilization. The native forest species require the adoption of appropriate practices in the nursery, such as the definition of the container volume and base fertilizer, to develop seedlings at lower cost. Thus, this study aimed to verify the performance of Handroanthus heptaphyllus seedlings grown in nurseries in different sizes of containers and different dosage of controlled release fertilizer (CRF). There was interaction between the volume of container and the fertilization for the height (H), stem diameter (SD), and H/SD relation. The shoot dry mass variable (SDM), root dry mass (RDM), total dry mass (TDM), SDM/RDM relation, Dickson quality index (DCI) and leaf area (LA) were influenced only by the base fertilizer. The highest values for these variables were, respectively, 15.68 cm; 6.55 mm, 2.58 cm mm-1; 2.05 g; 2.03 g; 3.84 g; 1.46; 1.15 and 246.97 cm². The H. heptaphyllus species is nutritionally demanding, positively responding to the high dose of CRF. Seedlings of H. heptaphyllus produced in tubes of 180 cm³ with 7.0 g L-1 of CRF present adequate growth.

Influência da Casca de Arroz Carbonizada no Desenvolvimento de Mudas de Enterolobium contortisiliquum (VELL.) Morong

UNICIÊNCIAS ◽  
2018 ◽  
Vol 22 (2) ◽  
pp. 76
Author(s):  
Vinícius Moreira Vaz ◽  
Douglas Santos Gonçalves ◽  
Priscila Bezerra De Souza
Keyword(s):  
Rice Husk ◽  
Quality Index ◽  
Dry Mass ◽  
Native Forest ◽  
Seedling Production ◽  
University Campus ◽  
Forest Nursery ◽  
Forest Species ◽  
Shoot Height ◽  
Dickson Quality Index

Entre as espécies florestais nativas indicadas para a recuperação de áreas degradas está o Enterolobium contortisiliquum (Vell.) Morong, pouco se sabe sobre os processos germinativos e de produção de mudas desta espécie. Diante disso, o presente estudo teve como objetivo avaliar a influência da casca de arroz carbonizada no desenvolvimento de mudas de Enterolobium contortisiliquum. O experimento foi conduzido no Viveiro Florestal da Universidade Federal do Tocantins, campus Universitário de Gurupi – TO, em que foram instalados cinco tratamentos e 20 repetições, com adição de Casca de Arroz Carbonizada (CAC) no substrato comercial Bioflora® (SCB), nas proporções de (T1) 0% CAC + 100% SCB, (T2) 25% CAC + 75% SCB, (T3) 50% CAC + 50% SCB, (T4) 75% CAC + 25% SCB e (T5) 100% CAC. Aos 20, 40 e 60 dias, após a semeadura, foram avaliados os parâmetros altura da parte aérea e diâmetro do coleto. Ao final de 60 dias foram obtidos os parâmetros: peso da massa seca da raiz, peso da massa seca da parte aérea, peso da massa seca total e índice de qualidade de Dickson. O delineamento experimental utilizado foi o inteiramente casualizado (DIC), as médias dos tratamentos foram comparadas através do Software Assistat 7.7 pelo teste Scott e Knott ao nível de 5% de probabilidade. O uso de casca de arroz carbonizada (CAC) influenciou no desenvolvimento de mudas de Enterolobium contortisiliquum (Vell.) Morong. Palavras-chave: Substratos Alternativos. Tamboril. Viveiro Florestal AbstractAmong the native forest species indicated for the recovery of degraded areas is Enterolobium contortisiliquum (Vell.) Morong, little is known about the germination processes and seedling production of this species. Therefore, the present study aimed to evaluate the influence of carbonized rice husk on the development of Enterolobium contortisiliquum seedlings. The experiment was conducted in the Forest Nursery of the Federal University of Tocantins, University campus of Gurupi - TO, five treatments and 20 replicates were installed, with the addition of Carbonized Rice Peel (CAC) in the commercial substratum Bioflora ® (SCB), in proportions (T1) 0% CAC + 100% SCB, (T2) 25% CAC + 75% SCB, (T3) 50% CAC + 50% SCB, (T4) 75% CAC + 25% SCB and (T5) 100% CAC . At 20, 40 and 60 days after sowing, the parameters of shoot height and shoot diameter were evaluated. At the end of 60 days, the following parameters were obtained: root dry mass weight, shoot dry mass weight, total dry mass weight and Dickson quality index. The used experimental design  was completely randomized (DIC), the means of the treatments were compared using Software Assistat 7.7 by the Scott and Knott test at the 5% probability level. The use of carbonized rice husk (CAC) influenced the development of Enterolobium contortisiliquum (Vell.) Morong seedlings. Keywords: Alternative Substrates. Monkfish. Forest Nursery

scholarly journals DOSES DE POTÁSSIO E LÂMINAS DE IRRIGAÇÃO NA QUALIDADE DE MUDAS DE EUCALIPTO

Nativa ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 643-649
Author(s):  
Antonio Henrique Cordeiro Ramalho ◽  
Fernanda Dalfior Maffioletti ◽  
Paulo André Trazzi ◽  
Eduardo Cordeiro Ramalho ◽  
Nilton Cesar Fiedler
Keyword(s):  
Water Management ◽  
Experimental Design ◽  
Aerial Part ◽  
Dry Mass ◽  
Control Treatment ◽  
Eucalyptus Urophylla ◽  
Tukey Test ◽  
Genetic Potential ◽  
Base Substrate

A produtividade florestal depende das potencialidades genéticas das matrizes, do ambiente proposto pelos substratos, frequência de irrigação, disponibilidade de luz, nutrição e das condições fitossanitárias. Assim, objetivou-se com o presente estudo analisar os efeitos da aplicação de potássio e de irrigação na qualidade de mudas de Eucalyptus urophylla. Para tal adotou-se o delineamento experimental em parcelas subdivididas definindo as 2 lâminas de irrigação (10 mm e 15 mm) como parcelas e os 5 níveis de potássio (0; 1,2; 2,4; 4,8; e 9,6 g L-1) como subparcelas, em 5 repetições compostas por 9 plantas. A comparação entre os métodos foi feita através teste de Tukey com 5% de probabilidade. Aos 120 dias, foram avaliadas: altura da parte aérea, diâmetro do colo, massa seca da parte aérea e da raiz. O tratamento testemunha apresentou as melhores médias em todos os parâmetros, sendo considerado o mais eficiente. A lâmina de irrigação de 15 mm foi considerada a mais eficiente. Portanto, conclui-se que qualquer que seja o incremento de potássio na produção de mudas, o mesmo deve se relacionar harmonicamente com a quantidade pré-existente no substrato base e com as exigências da cultura, de maneira que haja equilíbrio entre todas as partes. Palavras-chave: manejo hídrico; rustificação; substrato; casa de sombra.   IRRIGATION AND POTASSIUM LEVELS IN THE QUALITY OF EUCALYPTUS   ABSTRACT:  Forest productivity depends on the genetic potential of the matrices, the environment proposed by the substrates, frequency of irrigation, availability of light, nutrition and phytosanitary conditions. Thus, the aim of this study was to analyze the effects of potassium and irrigation on the quality of Eucalyptus urophylla seedlings. For this purpose, the experimental design was adopted in subdivided plots, defining the 2 layers of irrigation (10 mm and 15 mm) as plots and the 5 levels of potassium (0; 1.2; 2.4; 4.8; and 9.6 g L-1) as subplots, in 5 repetitions composed of 8 plants. The comparison between the methods was made using the Tukey test with a 5% probability. At 120 days, the following were evaluated: height of the aerial part, diameter of the neck, dry mass of the aerial part and the root. The control treatment showed the best averages in all parameters, being considered the most efficient. The 15 mm irrigation blade was considered the most efficient. Therefore, it is concluded that whatever the potassium increase in the production of seedlings, it must be harmoniously related to the pre-existing quantity in the base substrate and to the requirements of the culture, so that there is balance between all parts. Keywords: water management; rustification; substrate; shadow house.

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