Research on subsurface drip irrigation of grain sorghum in sandy soils
2021
Manea, D., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania) | Draghici, I., Research and Development Station for Plant Culture on Sandy Soils, Dabuleni (Romania) | Draghici, R., Research and Development Station for Plant Culture on Sandy Soils, Dabuleni (Romania) | Gidea, M., University of Agronomic Sciences and Veterinary Medicine of Bucharest (Romania)
The paper presents the results of the subsurface irrigation experimental research at grain sorghum. The experiment was located on a sandy soil plot, in the arid Dăbuleni region of southern Romania, under the climatic condition of 2020. Two variants of subsurface drip irrigation were placed: at a depth of 20 cm and at a depth of 40 cm. Observations and determinations were made regarding the soil humidity on the profile of 0–20 cm, 20–40 cm and 40–60 cm. Hydro physical indices (momentary water supply, the soil water reserve and the soil water deficit) were calculated to establish the irrigation norms according to the water consumption of the grain sorghum. The analysis of the results obtained for sorghum cultivation highlighted better use of subsurface irrigation with the location of drip lines at 40 cm depth, the level of grain production being 5758.3 kg•haE−1 , with a difference of 1182.3 kg•ha E−1 , distinctly significant from the irrigation located at 20 cm depth. Using this method, the water is distributed in the area of root development and ensures optimal humidity in the soil for a longer period, with no losses, compared to the burial variant of the drip lines at 20 cm, when a significant part of the water that rises in the soil layer to the surface, through the capillary ascent, is lost by evaporation.
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