Potassium distribution in drip irrigation with fertigation for different injection distances in the main line

Engenharia Agrícola

Guilherme V. Do Bomfim²  Juan Manzano¹  Benito M. De Azevedo¹  Denise V. Vasconcelos¹  Thales V. De A. Viana¹ 

[1] ,Universidade Federal do Ceará Departamento de Engenharia Agrícola Fortaleza CE

关键词: Uniformity;    Chemigation;    K2O;    Uniformidade;    Quimigação;    K2O;   

DOI  :  10.1590/S0100-69162014000600011

来源: SciELO

【 摘 要 】

The purpose of this research was to evaluate the K2O distribution uniformity by surface drip irrigation at Universitat Politecnica de Valencia, Valencia, Spain (39º 29′ N, 0º 23′ W, 20 m). The irrigation was performed by drip lines with not-compensated emitters, spaced 0.3 m. The fertigation was realized using a fertilizer injector pump of electric action with injection of 0.25 h. The experimental design used completely randomized blocks with five treatments and four replications. The treatments consisted of injection in five distances, located at 10; 20; 30; 40; 50 m of the first drip line. Samples were collected in emitters located at the start, at 1/3, at 2/3 and at the end of the drip lines. The nutrient concentration was determined by flame spectrophotometry. The Christiansen's uniformity coefficients (CUC), of distribution (DUC), of statistical (SUC) and of emission (eUC) were estimated. The K2O concentration and distribution decreased linearly with the increase of the injection distance. In all treatments, the CUC, SUC and DUC were described as 'excellent'. The eUC was described as 'recommended' only at smaller injection distances.

【 授权许可】

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