Simulation of Soil Temperature Field of Potato Ridge Sowing with White Film Mulch and Soil Covering the Seed Band
- PDF / 1,358,771 Bytes
- 15 Pages / 595.276 x 790.866 pts Page_size
- 72 Downloads / 176 Views
Simulation of Soil Temperature Field of Potato Ridge Sowing with White Film Mulch and Soil Covering the Seed Band Yongmei Wang 1 & Wei Sun 1
&
Yongheng Zhang 2
Accepted: 13 July 2020 # The Potato Association of America 2020
Abstract A numerical simulation using FLUENT was used to monitor field temperatures under a film-soil system of potato sowing with white film mulching and soil covering the seed band in the Dingxi district. The results showed that, with an increase in the solar altitude angle, the surface temperatures of the ridge increased gradually from East to West, and the heat transferred from the surface to the deep soil. It was found that soil temperatures within 20 cm of the ridge surface was greatly affected by solar radiation and air temperature changes. With an increase in depth, the lag effect on temperature changes became more prominent. Soil temperatures under mulching film on the seed band were lower than those under mulching film without covering soil, which indicates that covering the seed band with soil in using film mulching can effectively avoid scorching the buds and seedlings due to high temperatures. At 16:46 h, soil temperature at 5 cm below the surface of the East and West seed bands reached their peak temperatures of 312.09 and 311.0 K, respectively. At 19:16 h, soil temperatures at 5, 10, 15, 20 and 25 cm depth in seed bands were 309.28, 304.94, 298.05, 293.64, 290.49 and 308.66, 303.42, 297.70, 292.70, 289.67 K, respectively. Simulated soil temperatures at different depths in seed bands of potato ridge for 5 consecutive sunny days were compared with the measured temperatures. The relative error was less than 5.5%, indicating that the simulation method was reliable. This study is of significance to the growth-promoting techniques of mulched potato sowing, and in constructing a film-soil system which facilitates potato sprouting. Resumen Se usó una simulación numérica FLUENT para monitorear las temperaturas del campo bajo un sistema de película de suelo en siembra de papa con acolchado de plástico blanco y cubierta de suelo en la banda de semilla en el distrito de Dingxi. Los resultados mostraron que con un aumento en el ángulo de altitud solar, las temperaturas de la superficie de la cima aumentaron gradualmente del este al oeste, y el calor se transfirió de la superficie a la profundidad del suelo. Se encontró que las temperaturas del suelo dentro de 20 cm de la superficie de la cima se afectaban grandemente por la radiación solar y por los cambios en la temperatura del aire. Con un aumento en la profundidad, el efecto del rezago en cambios de temperatura se volvía más destacado. Las temperaturas del suelo bajo película de acolchado en la banda de la semilla fueron más bajas que aquellas bajo acolchado de plástico sin suelo de cobertura, lo que indica que cubriendo la banda de la semilla con suelo usando acolchado se puede evitar efectivamente quemadura de las yemas y plántulas debido a las altas temperaturas. A 16:46 horas, la temperatura del suelo a 5 cm debajo de la superficie
Data Loading...
