Drip irrigation wetting patterns in a mid Florida sandy soil
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Data
2016
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The wetting pattern of soil under drip irrigation is governed by soil texture, structure, initial water content, emitter spacing, discharge rate and irrigation frequency. Although drip irrigation is not common in central Florida “Ridge soils”, the “advanced citrus production system” can hold a promising future. High frequency, short duration pulses is an important factor to consider for efficient irrigation in this very sandy “Ridge” soils. The objective of this research was to evaluate the water distribution pattern under 1.9, 4.6 and 8.6 L h-1 discharge rate drippers over different wetting durations using three evaluation methods: a) EC5 soil water sensors, b) blue dye tracer, and c) a simple mathematical model developed for sandy soils. Of the three methods, the dye method is labor intensive and time consuming and was used only to evaluate one pulse rate with 3 pulse durations. Soil water sensors, though relatively expensive, gave the most detailed wetting patterns under different combinations of pulse rates and wetting durations. The model overestimated the wetting depth and underestimated the wetting diameter. With the initial soil moisture at 0.055 m3 m-3 and a constant application pressure of 138 kPa, the maximum achievable wetting diameter with increasing pulse rate and pulse duration was limited to 0.75 m. However, the wetting depth increased >1 m with >4.63 L h-1 pulse rate and 3-h duration. Preferential flow was minimal but had little influence on wetting pattern. The best combination was the 4.63 L h-1 emitter with a 3 h pulse that yielded the maximum wetting diameter (0.77 m) and the optimum wetting depth (0.77 m).
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Trickle irrigation, Soil water sensors, FD&CC blue dye, Soil water movement, Water use efficiency, Irrigação localizada, Sensors de água no solo, Movimento de água no solo
Citação
ALVES JUNIOR, Jose; BANDARANAYAKE; Wije Mallikaarachchige; SYVERTSEN, James. Drip irrigation wetting patterns in a mid Florida sandy soil. Irriga, Botucatu, v. 1, n. 1, p. 1-25, 2016. DOI: 10.15809/irriga.2016v1n01p1-25. Disponível em: https://revistas.fca.unesp.br/index.php/irriga/article/view/1552. Acesso em: 11 nov. 2024.