Distribution and storage characterization of soil solution for drip irrigation

Autor(es)

Souza, Claudinei F. ^[1] ; Folegatti, Marcos V. ^[2] ; Or, Dani ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Ctr Agr Sci, Araras, SP - Brazil

^[2] Univ Sao Paulo, Dept Agr Engn, Piracicaba, SP - Brazil

^[3] ETH, Swiss Fed Inst Technol, Zurich - Switzerland

• Tipo de documento: Artigo Científico
• Fonte: IRRIGATION SCIENCE; v. 27, n. 4, p. 277-288, MAY 2009.
• Citações Web of Science: 11

Resumo

The increased use of marginal quality water with drip irrigation requires sound fertigation practices that reconcile environmental concerns with viable crop production objectives. We conducted experiments to characterize dynamics and patterns of soil solution within wet bulb formed by drip irrigation. Time-domain reflectometry probes were used to monitor the distribution of potassium nitrate (KNO(3)) and water distribution from drippers discharging at constant flow rates of 2, 4 and 8 L h(-1) in soil-filled containers. Considering results from different profiles, we observed greater solute storage near the dripper decreasing gradually towards the wetting front. About half of the applied KNO(3) solution (48%) was stored in the first layer (0-0.10 m) for all experiments, 29% was stored in the next layer (0.10-0.20 m). Comparing different dripper flow rates, we observed higher solution storage for 4 L h(-1), with 45, 53 and 47% of applied KNO(3) solution accumulating in the first layer (0-0.10 m) for dripper flow rates of 2, 4 and 8 L h(-1), respectively. The results suggest that based on the volume and frequency used in this experiment, it would be advantageous to apply small amounts of solution at more frequent intervals to reduce deep percolation losses of applied water and solutes. (AU)

• Processo FAPESP: 03/00067-6 - Estudo da dinamica da agua e do soluto no solo para o dimensionamento e manejo da irrigacao por gotejamento utilizando a tecnica da reflectometria no dominio do tempo (tdr).
• Beneficiário: Marcos Vinícius Folegatti
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 05/00906-3 - Estudo da dinâmica da solução no solo para o dimensionamento e manejo da irrigação por gotejamento utilizando a técnica da reflectometria no domínio do tempo (TDR)
• Beneficiário: Claudinei Fonseca Souza
• Modalidade de apoio: Auxílio à Pesquisa - Regular