with fertigation was 14.6% higher than in the water replacement of 100% without fertigation.KEYWORDS: infiltration. water flow. humidity. com fertirrigação foi 14,6% superior à verificada na reposição hídrica de 100% sem fertirrigação.
This study had the objective to evaluate the effect of irrigation and fertigation (N) in the hydraulic capacity of an Oxisol cultivated with sugarcane (second year). The experimental design comprised randomized blocks in a 5 x 2 factorial scheme, with four replications. Treatments consisted of five levels of water replacement (100, 75, 50, 25 and 0%), with and without fertirrigation (N). The planting of sugarcane, cultivar RB85-5453, was performed in a double row (W-shaped), 8 m long, with 1.80 m spacing between the double rows, the distance between the crops in the double row was 0.40 m, with a total area of 52,8 m 2 in each paddock. For treatments with water, replacement (WR) a drip tube was placed in the ground at a depth of 0.20 m among the furrows of the double row. The drip tube (DRIPNET PC 16150) comprised a thin wall, 1.0 bar pressure, nominal discharge 1.0 L h -1 , and 0.50 m spacing between drippers. Nitrogen was applied by fertirrigation at a dose of 100Kg ha -1 , at 30-day intervals, with 10 applications throughout the development of the sugarcane culture. Potassium fertilization was fully realized at planting. Nitrogen was spread only in the treatment with 0% water replacement. Was evaluated hydraulic capacity versus log pressure head, at a depth of 40 cm, using RETC software. The maximum hydraulic capacity was 0.05 and 0.07 cm -1 in a logarithmic pressure head of 0.015 and -0.9 cm, for the water replacement of 0 and 100% with fertigation.
RESUMO: Objetivou-se com o experimento, verificar a influência de doses de potássio e sistemas de cultivo no comportamento de cultivares de algodão. Adotou-se o delineamento em blocos casualizados em esquema de parcelas sub-subdivididas, onde as parcelas constituíram cinco doses de potássio (50; 75; 100 (recomendada); 125 e 150%), as subparcelas dois sistemas de cultivo (plantio direto e plantio convencional) e as subsubparcelas quatro cultivares de algodoeiro (BRS 371, BRS 372, BRS 286 e BRS 201) distribuídos em três blocos. Utilizou sistema de gotejamento para irrigação suplementar, com base no Evaporímetro de Pichet. Avaliou-se aos 60 e 120 dias após semeadura índices de área foliar e variáveis reprodutivas das cultivares de algodoeiro. Os dados foram submetidos à análise de variância pelo teste F (p > 0,05) e para os dados referentes às doses de potássio, realizou-se análise de regressão, e referentes às cultivares e sistemas de cultivo teste Tukey (p > 0,05). A cultivar BRS 286 apresentou maior seletividade nas condições avaliadas e independentemente aos demais tratamentos, o sistema de plantio direto proporcionou as melhores respostas do algodoeiro herbáceo. Os maiores valores de ramos frutíferos e botão floral da cultivar BRS 371 no sistema de plantio direto foram verificados nas doses de 105,5 e 96,16% de potássio, respectivamente.
The diffusivity was 45% higher in the water replacement of 100% with fertigation when compared with the water replacement 75% with fertigation, already without fertigation this difference was reduced to 10%.KEYWORDS: hydraulic conductivity. porous. water content. difusividade foi 45% maior na reposição hídrica de 100% com fertirrigação quando comparado com a reposição hídrica de 75% com fertirrigação, já sem fertirrigação esta diferença foi reduzida para 10%.PALAVRAS-CHAVE: condutividade hidráulica. meio poroso. conteúdo de água.
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