scholarly journals TAXA DE CRESCIMENTO RELATIVO DA Brachiaria brizantha cv. Xaráes e Brachiaria brizantha cv. Marandu SOB FERTIRRIGAÇÃO NITROGENADA

Irriga ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 23
Author(s):  
Catariny Cabral Aleman ◽  
ERICK MALHEIROS RAMPAZO ◽  
TADEU ALCIDES MARQUES
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Irrigation Water ◽  
Nitrogen Fertilization ◽  
Irrigation Management ◽  
Growth Cycle ◽  
Brachiaria Brizantha ◽  
Relative Growth ◽  
Final Point ◽  
E Mail

TAXA DE CRESCIMENTO RELATIVO DA Brachiaria brizantha cv. Xaráes e Brachiaria brizantha cv. Marandu SOB FERTIRRIGAÇÃO NITROGENADA  CATARINY CABRAL ALEMAN¹; ERICK MALHEIROS RAMPAZO2 E TADEU ALCIDES MARQUES2 ¹Departamento de Engenharia Agrícola, UFV, Avenida PH Rolfs, s/n, 36570-000, Viçosa, MG, Brasil, e-mail: [email protected]²Departamento de Agronomia, UNOESTE, Rodovia Raposo Tavares, km 572, 19067-175, Presidente Prudente, SP, Brasil, e-mail: [email protected], [email protected]  1 RESUMO O objetivo do trabalho foi avaliar a taxa de crescimento relativo da Brachiaria brizantha cv. Xaráes e Brachiaria brizantha cv. Marandu submetido a diferentes diluições de uréia na água de irrigação. O experimento foi conduzido sob esquema fatorial considerando 2 espécies de pastagem e 6 doses de nitrogênio diluídas na água de irrigação com 5 repetições. As diluições de nitrogênio foram: 0, 900, 1800, 3200, 4000 e 4800 mg L-1. Determinou-se a taxa de crescimento relativo considerando a altura inicial e final de cada ciclo de crescimento (primeiro e segundo corte). No primeiro corte, as parcelas que não receberem nitrogênio apresentaram a maior taxa de crescimento. No segundo corte ocorreu diferenças significativas entre Xaraés e Marandu. Na pastagem Xaraés e na Marandu a diluição de 4000 mg L-1 e 4800 mg L-1 apresentaram a maior taxa de crescimento relativo. Palvras-chave: pastagem, manejo de irrigação, nitrogênio, eficiência da adubação.  ALEMAN, C. C.; RAMPAZO, E. M.; MARQUES, T. A.GROWTH RATE FOR THE Brachiaria brizantha cv. Xaraés and Brachiaria brizantha cv. Marandu UNDER FERTIRRIGATION NITROGEN  2 ABSTRACT The objective was to evaluate the relative growth rate of the Brachiaria brizantha cv. Xaraés and the Brachiaria brizantha cv. Marandu subjected to different dilution of urea in the irrigation water. The experiment was conducted in factorial design considering two species of grassland and 6 nitrogen doses diluted in irrigation water with five repetitions. The nitrogen dilutions were 0, 900, 1800, 3200, 4000 and 4800 mg L -1. A relative growth rate was determined, considering the initial and final point of each growth cycle (first and second cut). In the first cut, the portions that did not receive nitrogen had the highest growth rate. The second cut showed significant differences between Xaraés and Marandu. In the Xaraés pasture and Marandu dilution of 4000 mg L- 1 and 4800 mg L- 1 there was the highest relative growth rate. Keywords: pasture, irrigation management , nitrogen fertilization efficiency.

scholarly journals Crescimento e qualidade de mudas de Inga laurina em função do substrato e adubação suplementar

2016 ◽  
Vol 36 (86) ◽  
pp. 153 ◽  
Author(s):  
Murilo Figueredo Campos De Jesus ◽  
José Olimpio De Souza Júnior ◽  
Gabriel Salles Góes ◽  
Ediófila Brito-Rocha ◽  
Marcelo Schramm Mielke
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Nitrogen Fertilization ◽  
Forest Restoration ◽  
Quality Index ◽  
Relative Growth ◽  
Fertilization Experiment ◽  
Coir Dust ◽  
Dickson Quality Index

O objetivo deste estudo foi avaliar o efeito de misturas de um substrato comercial e pó de fibra de coco (PFC) no crescimento e na qualidade de mudas de Inga laurina (Sw.) Willd. (Fabaceae). Tubetes de polietileno foram preenchidos com quatro misturas do substrato comercial HS Florestal® (HSF) e PFC nas proporções: T1 = 100% HSF; T2 = 80% HSF + 20% PFC; T3 = 60% HSF + 40% PFC e T4 = 40% HSF + 60% PFC. Os experimentos foram realizados de forma independente, em presença (experimento I) e ausência (experimento II) de adubação suplementar. Foram realizadas avaliações de crescimento e qualidade das mudas ao final dos experimentos, aos 81 dias (experimento I) e 110 dias (experimento II) após a repicagem. Concluiu-se que o uso da adubação suplementar não apresentou diferenças em crescimento e qualidade das mudas de I. laurina até o percentual de 60% de PFC misturado ao substrato comercial. Sem a adição de adubação suplementar, a mistura com 80% HSF + 20% PFC é indicada para a produção de mudas de I. laurina. Além disso, a ausência de adubação suplementar nitrogenada e a adição de PFC ao substrato estimularam a nodulação.Growth and quality of Inga laurina seedlings as a function of the substrate and additional fertilizationThe aim of this study was to evaluate the effect of mixtures of a commercial substrate and coconut coir dust (CCD) to grow Inga laurina (Sw.) Willd. (Fabaceae) seedlings. Polyethylene tubes were filled with four mixtures of a commercial substrate HS Florestal® (HSF) and CCD in the following proportions: T1 = 100% HSF, T2 = 80% HSF + 20% CCD, T3 = 60% HSF + 40% CCD and T4 = 40% HSF + 60% CCD. The experiments were conducted independently, with supplement fertilization (experiment I) and without (experiment II). Seedlings growth and quality were evaluated at the end of the experiments, 81 days (experiment I) and 110 days (experiment II) after transplanting. It was concluded that supplement fertilization presented no differences in the growth and quality of I. laurina seedlings until up to 60% of PFC mixed with commercial substrate. Without supplement fertilization the mix of 80% HSF + 20% PFC is indicate for production of I. laurina seedlings. Moreover, the lack of supplement nitrogen fertilization and addition of PFC to the commercial substrate stimulated nodulation.Index terms: Dickson quality index; Relative growth rate; Forest restoration 

scholarly journals Seed mass effects on germination and growth of diverse European Scots pine populations

1994 ◽  
Vol 24 (2) ◽  
pp. 306-320 ◽  
Author(s):  
P.B. Reich ◽  
J. Oleksyn ◽  
M.G. Tjoelker
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Scots Pine ◽  
Field Experiments ◽  
Seed Mass ◽  
Growing Season ◽  
Turkish Population ◽  
Dry Mass ◽  
Relative Growth ◽  
Mass Effects

Seedlings of 24 European Scots pine (Pinussylvestris L.) populations were grown in controlled environment chambers under simulated photoperiodic conditions of 50 and 60°N latitude to evaluate the effect of seed mass on germination and seedling growth characteristics. Seeds of each population were classified into 1-mg mass classes, and the four classes per population with the highest frequencies were used. Photoperiod had minimal influence on seed mass effects. Overall, seed mass was positively related to the number of cotyledons and hypocotyl height. Populations differed significantly in seed mass effect on biomass. In northern populations (55–61°N), dry mass at the end of the first growing season was little affected by seed mass. However, dry mass in 9 of 15 central populations (54–48°N) and all southern (<45°N) populations correlated positively with seed mass. Relative growth rate was not related to seed mass within or across populations, and thus early growth is largely determined by seed mass. Relative growth rate also did not differ among populations, except for a geographically isolated Turkish population with the highest seed mass and lowest relative growth rate. After one growing season, height was positively correlated (r2 > 0.6) with seed mass in 15 populations. To check the duration of seed mass effects, height growth of 1- to 7-year-old field experiments established with the same seed lots were compared. Seed mass effects on height were strongest for 1-year-old seedlings and declined or disappeared by the age of 5–7 years among central and southern populations, but remained stable over that time in northern populations.

Sign in / Sign up

Export Citation Format

Share Document