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| Coelho,Rubens D.; Santos Júnior,Jorge L. C. dos; Mendoza,Christian J.; Ribeiro,Pedro H. P.; Cunha,Fernando N.; Teixeira,Marconi B.. |
| Na irrigação localizada com gotejadores posicionados de modo subsuperficial há o risco potencial de partículas de solo serem succionadas através do orifício de saída de água, em virtude da ocorrência de vácuo podendo resultar no entupimento dos mesmos. Objetivou-se, com este trabalho, avaliar o efeito da aplicação de vácuo no desempenho de diferentes modelos de gotejadores sob duas condições de textura de solo e posicionados de modo subsuperficial. Os tratamentos consistiram da aplicação dos níveis de sucção de -10, -15, -20 e -40 kPa, em solos de textura arenosa e argilosa, em 23 modelos de gotejadores usados com mais de 1 ano de funcionamento. O desempenho dos emissores no gotejamento subsuperficial foi influenciado pela textura do solo. De modo geral,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gotejamento subsuperficial; Obstrução; Redução de vazão. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662013000900001 |
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| Silva,Patrícia F. Da; Dantas Neto,José; Lima,VERA L. A. DE; Santos,Delfran B. Dos; Ribeiro,Pedro H. P.. |
| ABSTRACT The use of tools such as process capability index for irrigation aims to observe how this irrigation is adequate in terms of quality. The aim of the study was analyzing the Christiansen uniformity coefficient and the flow of a drip irrigation system with self-compensating emitters under water different salt concentrations, using the process capability index. The research was conducted in a greenhouse at the Federal University of Campina Grande (UFCG). The experimental design was a randomized block in a factorial 5 x 2 with three replications, the factors consisted of five levels of irrigation water salinity (CEw) (0.6, 1.5, 2.5, 3.5 and 4.5 dS m−1 at 25°C) and two running times (0 and 350 hours of operation). The Christiansen uniformity... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Quality engineering; Flow; Quality control; Christiansen uniformity. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000601086 |
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| Coneglian,Ademilson; Ribeiro,Pedro H. P.; Melo,Bruno S.; Pereira,Rennan F.; Dorneles Junior,Joáz. |
| ABSTRACT High prices and the scarcity of hardwoods require the use of alternative wood sources, such as the Guapuruvu (Schizolobium parahybae), an arboreal species native to the Atlantic Forest, which has fast growth and high market potential. However, there is no information on its cultivation in the Brazilian Cerrado. Thus, this study aimed to analyze the contribution of mineral fertilization and liming in a Cerrado soil on the initial growth of Schizolobium parahybae. The experiment was set in a randomized block design, with 4 treatments (Cerrado soil; soil + liming; soil + fertilizer; and soil + fertilizer + liming) and 15 replicates. The following variables were analyzed: plant height, stem diameter, number of leaves, total, shoot, leaf, root and stem... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Guapuruvu; Native species; Timber potential. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001000908 |
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