Neste trabalho, objetivou-se aglutinar elementos para o uso mais adequado de casas-de-vegetação e telados, com a finalidade de experimentação agrícola. São discutidos os fatores água, temperatura do ar e irradiância solar no interior de coberturas artificiais, bem como o manejo do ambiente em termos de tamanho de vasos, seu posicionamento nas casas-de-vegetação e o uso da água de irrigação. Deve-se evitar telas de cor verde (reflete o verde e absorve o vermelho, usado na fotossíntese) e se deve ter os vasos sempre da mesma cor e tamanho.
A presente pesquisa foi desenvolvida na Estação Experimental de Lagoa Seca, da Empresa Estadual de Pesquisa Agropecuária da Paraíba, EMEPA-PB, tendo como objetivo identificar as conseqüências do conteúdo de umidade do solo, em algumas variáveis de crescimento, da cultura do feijão (Phaseolus vulgaris L.). O delineamento estatístico utilizado foi o de blocos casualizados, com quatro tratamentos e quatro repetições. Os tratamentos basearam-se em diferentes lâminas de irrigação: 80, 160, 320 e 140,2 mm, distribuídas nas fases fenológicas da cultura e fundamentadas em estudos anteriormente desenvolvidos, e na umidade do solo. Os efeitos dos diferentes regimes de irrigação foram avaliados mediante as variáveis de crescimento, fitomassa total, área foliar, índice de área foliar, taxa de assimilação líquida e razão da área foliar, as quais apresentaram valores diferenciados em resposta aos tratamentos empregados, com aumento de valores nas plantas com maior suprimento de água.
Este trabalho foi conduzido em ambiente protegido (AE) e natural (AN), e teve como objetivo avaliar o desenvolvimento e quantificar a ação dos elementos meteorológicos e graus-dia sobre o crescimento da alface em duas épocas diferentes. O trabalho de pesquisa foi desenvolvido na Empresa Estadual de Pesquisa Agropecuária da Paraíba -EMEPA, nos períodos de 30/05 a 08/08/2007 (Inverno) e 10/09 a 22/11/2007 (Primavera), utilizando-se a alface tipo Americana Irene. As temperaturas médias do ar no AE foram sempre maiores que no AN nos dois experimentos. Os valores de umidade relativa média do ar obtida no AN foram sempre maiores que os do AE. Os maiores valores de graus-dia no AE acarretaram na redução do ciclo e da fitomassa seca total da alface. O ambiente protegido proporciona um micro-clima favorável ao desenvolvimento da cultura, antecipando a colheita em uma semana, nas duas épocas de cultivo, e no inverno oferece as melhores condições energéticas para o crescimento e desenvolvimento desta cultivar.Palavras-chave: Lactuca sativa, ambiente protegido e natural, estações do ano.Cabbage lettuce development based on the environment, season and degree-days
RESUMOObjetivou-se, através deste trabalho, desenvolver e validar uma régua que mede, de maneira rápida e não destrutiva e diretamente no campo, a área foliar do algodoeiro. Aos 90 dias após a emergência da cultura, amostras de folhas de 10 plantas do algodoeiro, cultivar BRS 187 8H, foram coletadas, das quais se retiraram todas as folhas para composição da amostragem e, em seguida, tiradas cópias xerox, e só então feitas medidas de comprimento e, com o auxílio de um planímetro, mediu-se a área foliar para definir a escala da régua. Em uma segunda etapa se utilizaram as cultivares BRS Safira, BRS 201 e BRS Verde, para testar a régua. A análise de regressão entre a área foliar medida na amostra de folhas e a estimada, obteve bom ajuste com coeficiente de determinação igual a 0,95. Comparando-se as médias entre os dois métodos verificou-se que a média da área das folhas das quatro cultivares do algodoeiro medidas com a régua, não diferiu estatisticamente da área média medida com o planímetro. A régua pode ser recomendada para se fazer medida direta no campo em cultivares de algodão de folhas cordiformes e planofilares, com relação à horizontal.Palavras-chave: equação de regressão, folha okra, análise de crescimento Development of a ruler for measurements of leaf area of the cotton plant ABSTRACTThe objective of this research was to develop and validate a ruler that measures the leaf area of the cotton plant, in a quick and non-destructive manner and directly in the field. Ninety days after the emergence of the crop, leaf samples of tencotton plants of cultivar BRS 187 8H were collected, of which all leaves were removed to prepare the samples and, after that, they were photocopied and length measurements were done with the help of a planimeter to define the range of the ruler. In the second stage of the experiment, the cultivars BRS Safira, BRS 201 and BRS Verde were used to test the ruler. The analysis of regression between the leaf area measured in samples of leaves and the estimated areas showed a good adjustment with coefficient of determination equal to 0.95. Comparing the means of both the methods, it was verified that the mean leaf area of the four cultivars of cotton, measured with the proposed ruler, did not differ statistically from the mean area measured with the planimeter. The ruler can be recommended to determine, directly in the field, the leaf area of cotton cultivars with cordiform and planofile leaf structure, in relation to the horizontal.
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mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif";} </style> <![endif]--><p class="MsoBodyText2" style="text-align: justify; line-height: normal;"><span style="font-size: 10.0pt;" lang="X-NONE">Mesmo sabendo-se que a temperatura do solo é um dos fatores ambientais de maior importância para a agricultura, poucas pesquisas foram realizadas até então a respeito dessa variável. Logo, o presente trabalho tem como objetivo o estudo das características térmicas do solo através de dados coletados no Instituto Nacional do Semiárido (INSA), durante os meses de julho a dezembro do ano de 2012. Para avaliar a magnitude da difusividade térmica do solo foram utilizados os métodos da amplitude, do arco tangente e o logarítmico. A partir da análise dos resultados verificou-se boa consistência das estimativas da difusividade térmica do solo obtidas pelos métodos distintos.</span></p>
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