scholarly journals Productivity of potato seed submitted to different doses of potassium in hydroponic system

Author(s):  
Camila B.A. Tufik

The potato is one of the most economically important crops in Brazil, and among the items that most cost the production is seed potatoes. The deficiency of one nutrient can interfere with the absorption and accumulation of the others in plants. The aim of this work was to quantify the optimal potassium (K) dose for minituber basic seed potato yield in hydroponic system. The experiment was installed in a greenhouse with the Agata cultivar minitubers. The treatments consisted of five doses of K (0.0; 2.5; 5.0; 7.5 e 10.0 mmol L-1) with four repetitions. The experimental design was a randomized block design. Data were submitted to analysis of variance and regression. The number of tubers, fresh mass, classification and dry mass were measured. The content of K and content other nutrients in the seed potato tubers were also evaluated. In the hydroponic systems, the maximum yield per plant was 48.41 tubers obtained with 6.15 mmol L-1 of K and maximum mass of fresh matter was 646.6 g.

2021 ◽  
Vol 39 (3) ◽  
pp. 341-345
Author(s):  
Paulo Henrique S Silva ◽  
Arthur Bernardes Cecílio Filho ◽  
Isaias dos S Reis ◽  
Carolina S Nascimento ◽  
Camila S Nascimento

ABSTRACT Nitrogen (N) is the second most accumulated nutrient in rocket. This nutrient greatly affects growth, productivity and quality of the vegetable. Rocket is the second most widely grown leafy vegetable in hydroponic system; however, no studies on how N concentration in nutrient solution affects this crop can be found in literature. We studied four concentrations (79.2; 118.8; 158.4 and 237.6 mg L-1 of N) in a randomized block design with five replicates. Maximum number of leaves, leaf area, dry mass and productivity of rocket cv. ‘Folha larga’ were obtained with the highest N concentration. The rocket quality, evaluated by the nitrate content, was maximum with 210.2 mg L-1 of N and its value in the concentration which maximized productivity is in the acceptable range for vegetables; so, it is recommended to grow rocket with 237.6 mg L-1 of N in the nutrient solution.


2017 ◽  
Vol 30 (4) ◽  
pp. 818-824 ◽  
Author(s):  
DEISE SILVA CASTRO PIMENTEL CARDOSO ◽  
MARIA APARECIDA NOGUEIRA SEDIYAMA ◽  
YONARA POLTRONIERI ◽  
MAIRA CHRISTINA MARQUES FONSECA ◽  
YANE FERNANDES NEVES

ABSTRACT The N:K ratio influences the balance between vegetative and reproductive stages, because potassium plays important roles in the processes that regulate plant growth when the nitrogen availability is high. However, there is a lack of information on the N:K ratio suitable for cucumber cultivation in an NFT-hydroponic system. The objective of this study is to evaluate the different N:K ratios in fruiting nutrient solutions for cucumber production in a hydroponic system. Treatments consisted of two cucumber hybrids (Natsuno Kagayaki and Runner) and four nutrition solutions with different N:K ratios (w/w) (1:0.5, 1:1.0, 1:2.0, and 1:3.0) in the reproductive phase arranged as split plots in a randomized block design with four replications. On the 33rd day after sowing (DAS), the SPAD index on the fourth expanded leaf from the plant apex, number of broaches, and harvests were evaluated. The aerial parts of the plants were collected on the 54th DAS for evaluation of fresh mass, dry mass, and number of leaves per plant. The results showed that the highest concentration of K in the fruiting nutrient solution does not alter the length of the fruits but increases their diameter yield. The N:K ratios in the 1:2.0 and 1:3.0 (w/w) nutrient solutions provided greater yields in both evaluated hybrids. The hybrid Natsuno Kagayaki, however, showed the highest productivity, and it is recommended for hydroponic cultivation.


2018 ◽  
Vol 10 (11) ◽  
pp. 269
Author(s):  
Francisco de Assis de Oliveira ◽  
José de Souza Leite Neto ◽  
Mychelle Karla Teixeira de Oliveira ◽  
Luan Alves Lima ◽  
Luan Vitor Nascimento ◽  
...  

The quality of water used to prepare a nutritive solution is a fundamental factor for plants to express their maximum yield potential, however, due to an emerging water scarcity, the use of saline water is turning into a challenge for producers and scientists. The present study was developed to evaluate the effect of potassium nitrate in two arucula cultivars fertigated with saline nutritive solutions in semi-hydroponic system. It was used a randomized block design, in factorial scheme 2 × 4, with two arucula cultivars (Cultivada and Folha Larga) and four nutritive solutions [S1-standard nutritive solution; S2-standard nutritive solution + NaCl (7.5 dS m-1); S3-S2 + 50% of KNO3; S4-100% of KNO3], with three replicates, with each experimental unit represented by a gutter of 1.5 m filled with coconut-fiber based substrate and 30 plants per replicate. Plants were collected 40 days after planting and evaluated for following variables: height, amount of leaves, leaf area, above ground fresh matter, above ground dry matter, leaf succulence, percentage of dry matter, and specific leaf area. Cultivada is more productive than Folha Larga, but presented higher sensibility to salinity. Increase of salinity in the water for preparation of nutritive solution negatively affects arucula cultivars’ development in semi-hydroponic system. The use of potassium nitrate reduced the effects of salinity on the Folha Larga’s development, but did not inhibit negative effects of salinity in any cultivar. Growth of arucula, Folha Larga, using saline water in semi-hydroponic system is feasible with addition of 50% of KNO3.


2011 ◽  
Vol 51 (1) ◽  
pp. 38-43 ◽  
Author(s):  
Jagdev Kular ◽  
Sarwan Kumar

Quantification of Avoidable Yield Losses in OilseedBrassicaCaused by Insect PestsA six year field study was conducted from 2001-2002 to 2006-2007 at Punjab Agricultural University, Ludhiana, India to study the losses in seed yield of differentBrassicaspecies (B. juncea, B. napus, B. carinata, B. rapaandEruca sativa) by the infestation of insect pests. The experiment was conducted in two different sets viz. protected/sprayed and unprotected, in a randomized block design, with three replications. Data on the infestation of insect pests, and seed yield were recorded at weekly intervals and at harvest, respectively. The loss in seed yield, due to mustard aphid and cabbage caterpillar, varied from 6.5 to 26.4 per cent.E. sativasuffered the least loss in seed yield and harboured the minimum population of mustard aphid (2.1 aphids/plant) and cabbage caterpillar (2.4 larvae/plant). On the other hand,B. carinatawas highly susceptible to the cabbage caterpillar (26.2 larvae/plant) and suffered the maximum yield loss (26.4%).


2010 ◽  
Vol 39 (8) ◽  
pp. 1666-1675 ◽  
Author(s):  
Marcio Mahmoud Megda ◽  
Francisco Antonio Monteiro

The objective of this work was to study morphogenic characteristics, and dry matter production of roots and shoots of marandu palisadegrass (Brachiaria brizantha cv. Marandu) submitted to combinations of nitrogen and potassium, in a nutritive solution, employing silica as substrate. The experiment was carried out in a greenhouse during the summer. It was used a 5² fractionated factorial scheme with 13 combinations of nitrogen and potassium, which were distributed in a randomized block design, with four replications. The nitrogen × potassium interaction was significant for the number of tillers and leaves, for leaf area, for shoots and root section dry mass, for total length and surface and specific length and surface in the roots. Production of aerial part dry mass positively correlated with the number of tillers and leaves and grass leaf area. Nitrogen rates modulated the root system development, and the root specific length and surface decreased when high rates of nitrogen and potassium were supllied. Nitrogen and potassium influence Marandu palisadegrass morphogenic characteristics, which are determinant for grass dry matter production.


2015 ◽  
Vol 28 (3) ◽  
pp. 230-238 ◽  
Author(s):  
PHILIPE LIMA DE AMORIM ◽  
JANAINA AZEVEDO MARTUSCELLO ◽  
JOSÉ TEODORICO DE ARAÚJO FILHO ◽  
DANIEL DE NORONHA FIGUEIREDO VIEIRA DA CUNHA ◽  
LIANA JANK

ABSTRACT: Cultivars of the genus Nopalea are known in Brazil for being tolerant to cochineal carmine attacks, thus making the cultivation of this genus a promising alternative for mitigating the negative effects of this insect on the production of biomass. With the objectives of characterizing morphologically spineless forage cactus varieties and identify morphological characteristics that may be the focus in spineless forage cactus breeding programs, an experiment was conducted in a completely randomized block design with 11 treatments and four replications. The variety Alagoas showed the highest values of weight, area and volume of cladodes. The varieties Negro Michoacan F7 and V7, Tamazunchale V12 showed the highest values of the cladode area index, the total volume of cladodes and total fresh mass production. The varieties Negro Michoacan V7 and F7 presented the highest water use efficiency and dry mass yield. Cladode volume showed the highest correlation coefficients with the fresh weight of cladodes. Aiming the release of varieties for biomass production, varieties Negro Michoacan F7, V7 and Tamazunchale V12 may substitute the Miúda variety. The number and cladode area index may be used as criteria for selection of superior varieties in breeding programs.


2017 ◽  
Vol 41 (2) ◽  
pp. 117-127 ◽  
Author(s):  
Thais Ramos da Silva ◽  
Jairo Osvaldo Cazetta ◽  
Samira Domingues Carlin ◽  
Bruna Robiati Telles

ABSTRACT Although there are evidences that the proper supply of mineral nutrients to plants relieves water stress, little is known on the approach of how the drought affects the absorption and accumulation of nutrients by distinct sugar cane genotypes, or in different parts of a same plant. Thus, the objective of this study was to determine the content and accumulation of N, P and K in the aerial part of plant from three genotypes of sugar cane, submitted to three water potentials in the soil, and check the relationship of these variables with the tolerance of plants to prolonged drought. In order to access this objective, an experiment under greenhouse conditions, comprised by a fatorial 3 × 3, in a randomized block design, and four replicates was carried out. After 90 days from treatment imposition, the plant transpiration rate, plant dry mass, concentration of N, P and K were determined in leaves and culms, as well as in total plant shoot were measured. It was found that tolerance to drought in sugar cane is related to higher levels of N and K in the leaves and stems, and larger accumulations of K and P in the plant shoot. There is high positive correlations among accumulation of N, P and K in the plant shoot and dry matter production by plants submitted to drought. There are intermediate correlations among plant transpiration and nutrient uptake by plants under drought. Plants of the genotype SP81-3250 are more tolerante to prolonged drought, than the RB855453 and IACSP95-5000 plants.


Irriga ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 764-770
Author(s):  
ANA RAQUEL DE MELO ◽  
JOSÉ FLÁVIO FERREIRA DE SOUSA ◽  
CRISTIANE NUNES CONCEIÇÃO ◽  
MARIA ROSELANE ALVES OLIVEIRA

CONDITIONING OF SEEDLINGS OF PEPPERS (CAPSICUM ANNUM L.), INFLUENCED BY THE HYDROPONIC SYSTEM "FLOATING"     ANA RAQUEL PEREIRA DE MELO 1; JOSÉ FLÁVIO FERREIRA DE SOUSA2; CRISTIANE NUNES DA CONCEIÇÃO 3 E MARIA ROSELANE ALVES OLIVEIRA4   1 Engenheira Agrônoma, Instituto Federal do Maranhão - Campus Codó-MA, Rua do Poraquê S/N Codó Novo, Zona Rural, CEP: 65400000, Codó- MA, Brasil, [email protected]; 2 Engenheiro Agrônomo, Instituto Federal do Maranhão - Campus Codó-MA, Rua do Poraquê S/N Codó Novo, Zona Rural, CEP: 65400000, Codó- MA, Brasil, [email protected]; 3 Engenheira Agrônoma, Instituto Federal do Maranhão - Campus Codó-MA, Rua do Poraquê S/N Codó Novo, Zona Rural, CEP: 65400000, Codó- MA, Brasil, [email protected]; 4 Engenheira Agrônoma, Instituto Federal do Maranhão - Campus Codó-MA, Rua do Poraquê S/N Codó Novo, Zona Rural, CEP: 65400000, Codó- MA, Brasil, [email protected].     1 ABSTRACT   The aim of this research to assess the development of pepper seedlings under different nutritional conditions, under the influence of the "Floating" aiming system, a new production, alternative for larger producers’ safety in producing sustainably, ensuring the production of healthy food and income generation. The production of seedlings occurred in polyethylene plastic trays, where they were placed 2/seeds paprika cells of Yolo Wonder cultivar. After the emergence of seedlings was thinning. The experimental design was completely randomized design, containing 5 treatments with 4 replications. The treatments were T1-trays remained out of the "floating", receiving water irrigation 2 times a day; T2-trays of floating, remained out more irrigation the same solution of the "floating" 3 times a week, using 500 ml of solution per Pan; T3-were pans 12:00 are in "floating" and 12:00 am out; T4-trays remained throughout the period of the test in the "floating"; T5-trays remained throughout the period in the "floating", except in the last week. The solution was composed of soluble fertilizer, calcium nitrate, potassium chloride, Triple Superphosphate and Urea, and was changed every Ten days. The parameters analyzed were height of the plant; Root length; Fresh matter weight of shoot; Weight of fresh root matter; Dry matter weight of shoot; Root dry matter weight; Diameter of the stem. All parameters analyzed were submitted to analysis of variance and averages compared by Tukey test to 1% in the case of significance. The treatment proved to be more feasible was the T4, as this medium to larger variables introduced height, stem diameter, plant fresh mass aerial and aerial dry mass.   Keywords: Nutrient solution, production, safety, productive Alternative.     MELO, A. R. P.; SOUSA, J. F. F.; CONCEIÇÃO, C. N. E OLIVEIRA, M. R. A. CONDICIONAMENTO DE MUDAS DE PIMENTÃO (CAPSICUM ANNUM L.), INFLUENCIADAS PELO SISTEMA HIDROPÔNICO “FLOATING”           2 RESUMO   Objetivou-se com esta pesquisa avaliar o desenvolvimento de mudas de pimentão submetidas a diferentes condicionamentos nutricionais, sobre influência do sistema “Floating” visando, uma nova alternativa de produção, para propiciar aos produtores maior segurança em produzir sustentavelmente, para com isso garantir a produção de alimentos saudáveis e geração de renda. A produção de mudas ocorreu em bandejas de polietileno plástico, onde foram colocadas 2 sementes/célula de pimentão da cultivar Yolo Wonder. Após a emergência das plântulas, foi feito o desbaste. O delineamento experimental foi Inteiramente Casualizado, contendo 5 tratamentos com 4 repetições. Os tratamentos foram: T1- As bandejas permaneceram sempre fora do “floating”, recebendo irrigação de água 2 vezes ao dia; T2 – As bandejas permaneceram fora do floating, mais irrigação da mesma solução do “floating” 3 vezes por semana, usando 500 ml da solução por bandeja; T3 – As bandejas ficaram 24 h em “floating” e 24 h fora; T4 - As bandejas permaneceram todo o período do ensaio no "floating"; T5 - As bandejas permaneceram todo o período no "floating” ", exceto na última semana. A solução foi composta pelos fertilizantes solúveis, Nitrato de Cálcio, Cloreto de potássio, Superfosfato Triplo e Ureia, e foi trocada a cada Dez dias. Os parâmetros analisados foram: Altura da planta; Comprimento da raiz; Peso da matéria fresca da parte aérea; Peso da matéria fresca da raiz; Peso da matéria seca da parte aérea; Peso da matéria seca da raiz; Diâmetro do caule. Todos os parâmetros analisados foram submetidos à análise de variância e as médias comparadas pelo teste de Tukey a 1% no caso de significância. O tratamento que se mostrou mais viável foi o T4, pois este apresentou maiores médias para as variáveis altura da planta, diâmetro caulinar, massa fresca da parte aérea e massa seca da parte aérea.   Palavras-chave: Solução Nutritiva, Alternativa de Produção, Segurança produtiva.


Irriga ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 166
Author(s):  
Marcos Eric Barbosa Brito ◽  
Francisco Vanies da Silva Sá ◽  
Luderlândio De Andrade Silva ◽  
Rômulo Carantino Lucena Moreira ◽  
Francisco Hevilásio Freire Pereira ◽  
...  

CRESCIMENTO E TROCAS GASOSAS DE PORTA-ENXERTOS DE CITROS EM SISTEMA HIDROPÔNICO ALTERNATIVO MARCOS ERIC BARBOSA BRITO1; FRANCISCO VANIES DA SILVA SÁ2; LUDERLANDIO DE ANDRADE SILVA3; ROMULO CARANTINO LUCENA MOREIRA4; FRANCISCO HEVILASIO FREIRE PEREIRA1 E WALTER DOS SANTOS SOARES FILHO5 1 Eng. Agrônomo, Doutor, Professor da Unidade Acadêmica de Ciências Agrárias, Universidade Federal de Campina Grande, Pombal, PB. E-mail: [email protected] ; [email protected] Eng. Agrônomo, Doutorando em Engenharia Agrícola, Unidade Acadêmica de Engenharia Agrícola, Universidade Federal de Campina Grande, Campina Grande, PB. E-mail: [email protected] Eng. Agrônomo, Mestrando em Horticultura Tropical, Unidade Acadêmica de Ciências Agrárias, Universidade Federal de Campina Grande, Pombal, PB. E-mail: [email protected] Eng. Agrônomo, Mestrando em Sistemas Agroindustriais, Unidade Acadêmica de Ciências Agrárias, Universidade Federal de Campina Grande, Pombal, PB. E-mail: [email protected] Eng. Agrônomo, Doutor, Pesquisador da Empresa Brasileira de Pesquisa Agropecuária, Embrapa Mandioca e Fruticultura, Cruz das Almas, BA. E-mail: [email protected]  1 RESUMO Objetivou-se avaliar a morfofisiologia de genótipos de citros recomendados como porta-enxertos, em sistema hidropônico alternativo, a partir de vasos de Leonard a base de garrafa pets. O experimento foi desenvolvido em ambiente protegido, sendo estudados treze genótipos de citros [1 – Hibrido Trifoliado (HTR)-127; 2– Tangerineira ‘Sunki Comum’ (TSKC) x Citrange Argentino (CTARG)-019, 3– TSKC; 4 – Limoeiro Rugoso da Flórida (LRF); 5 - limoeiro ‘Cravo’ (LCR) x Poncirus trifoliata (TR) - 001; 6 – TSKC x Citrumelo Swingle (CTSW)-028; 7 - TSKC x CTSW-033; 8 - TSKC x CTSW-041; 9 - TSKC x (LCR x TR)-040; 10–HTR-116; 11 - limoeiro ‘Cravo Santa Cruz’ (LCRSTC); 12 - limoeiro ‘Volkameriano’ (LVK) e 13 - HTR–069], em blocos casualizados com quatro repetições e quatro plantas úteis por parcela. As plantas foram cultivadas em sistema hidropônico alternativo, a partir de um sistema de vasos de Leonard confeccionados com garrafas de polyethylene terephthalate (PET) e distribuição gravitacional da solução de Hogland® em fluxo contínuo, sendo as garrafas preenchidas com substrato comercial a base de pó de coco e as plantas cultivadas até os 75 dias após semeadura, quando se avaliou aspectos de crescimento e as trocas gasosas das plantas. O sistema hidropônico alternativo com uso de vasos de Leonard pode ser usado para o desenvolvimento morfofisiológico de mudas cítricas; Os genótipos TSKC x CTARG– 019, LRF, TSKC x (LCR x TR) – 040, LCRSTC, LVK e HTR – 069 possuem maiores potenciais fisiológicos e de crescimento vegetativo, sendo indicados para obtenção de mudas mais precoces. Palavras-chave: Citrus spp.; mudas; hidroponia.  BRITO, M.E.B.; SÁ, F.V.S.; SILVA, L.A.; MOREIRA, R.C.L.; PEREIRA, F.H.F.; SOARES FILHO, W.S.CITRUS ROOTSTOCKS FORMATION ON ALTERNATIVE HYDROPONIC SYSTEM USING LEONARD POTS 2 ABSTRACT In order to evaluate the morphological development from citrus genotypes with potential to rootstock, on alternative hydroponic system from Leonard pots made with pets pots. An experiment was realized in greenhouse. It were studied thirteen genotypes of citrus (1- HTR-127; 2- TSKC x CTARG-019; 3- TSKC; 4- LRF; 5- LCR x TR-001; 6 - TSKC x CTSW-028; 7- TSKC x CTSW–033; 8- TSKC x CTSW-041; 9- TSKC x (LCR x TR)- 040; 10- HTR-116; 11- LCRSTC; 12- LVK and 13- HTR-069), in a randomized block design, with four replications and four plants by parcel, crop on alternative hydroponically system using Leonard’s pots made with polyethylene terephthalate (PET), being the Hoagland’s solution distributed by gravitation in continuous rate, in west coconut, being plants cultivated for 75 days after sowing, when it was evaluated the growth and gas exchange aspects. The alternative hydroponic system with use of Leonard pots can be used for morphophysiological development of citrus seedlings; The genotypes TSKC x CTARG– 019, LRF, TSKC x (LCRxTR) – 040, LCRSTC, LVK e HTR – 069  have greater physiological and of vegetative growth potential, being suitable for obtaining early seedlings. Keywords: Citrus spp.; seeds propagation; hydroponics. 


2019 ◽  
Vol 11 (9) ◽  
pp. 272
Author(s):  
Milena Barretta Franceschetti ◽  
Leandro Galon ◽  
Maico André Michelon Bagnara ◽  
Renan Pawelkiewicz ◽  
Leonardo Brunetto ◽  
...  

Among the factors which affect crop productivity, there are weeds which compete for environment resources. The objective of this work was to determine the periods of interference of alexandergrass on the morphophysiology and productivity components of black beans. The experiment was conducted in a complete randomized block design with four replications. The bean cultivar of the black type used was IPR Uirapuru, being the treatments separated in two models of interference: in the coexistence group, the crop of the bean lived with the alexandergrass by growing periods of 0, 7, 14, 21, 28, 35, 42 and throughout the cycledays after emergence and throughout the cycle; in the control group the crop was kept free of the infestation for the same periods described previously. At 42 DAE were evaluated the variables related to plant morphology and physiology (height of bean plants, number of trifoliate leaves, dry mass plant, number of grains pods, number od pods plants, stomatal conductance, internal CO2 concentration, photosynthetic activity, efficiency of carboxylation, efficient use of water, transpiration rate). Considering the results, it is possible to conclude that the critical period of interference prevention (CPIP) comprises 24 to 50 DAE, the period before the interference (PBI) was 24 DAE and the total period of interference prevention (TPIP) was 50 days and that the morphological and physiological variables of the plants were negatively affected in the coexistence with the alexandergrass when compared to the treatments kept free of weeds throughout the crop cycle.


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