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An attempt to find a suitable place for soil moisture sensor in a drip irrigation system

Information Processing in Agriculture 2022年第2期9卷 254-265页

作者： Zahra Amiri Mahdi Gheysari Mohammad Reza Mosaddeghi Samia Amiri Mahsa Sadat Tabatabaei water Engineering Department College of AgricultureIsfahan University of TechnologyIsfahan84156-83111Iran Environmental Sciences Department University of California-RiversideCA92521USA Department of soil Science College of AgricultureIsfahan University of TechnologyIsfahan84156-83111Iran Department of Civil and Environmental Engineering Colorado State UniversityFort CollinsColorado 80523USA

Determination of an appropriate location for monitoring soil water content (SWC) is a keyfactor in efficient use of water in precision agriculture, however, the main challenge is thedynamic movement of water and root development in the soil profile. The objective of thisstudy was investigating how SWC distribution in a loam soil profile at two growth stages ofmaize may impact the suitable location for SWC monitoring in a drip-tape irrigation system.A new concept, Average Moisture Representative Surface (AMRS) was proposed to determine the surface of the soil profile, which represent the average soil moisture of the wettedvolume. SWC samples were taken during two irrigation intervals (48~52 days after planting(DAP) and 68~73 DAP) and root growth pattern was studied through root length density (RLD)at 50 and 100 DAP. The results revealed that a non-uniform wetting pattern after irrigationlimits the appropriate locations for SWC monitoring to point measurements and with time,SWC depletion resulted in enlarging AMRS. At the end of growing season, an increase of rootgrowth around the drippers increased the variation of root water uptake in different soil layers, and thus optimal place for soil sensors was limited to the upper layers, where the maximum root water uptake occurred. Overall, it is recommended to install soil sensors, such astensiometers and TDRs at a horizontal distance of 5~20 cm from the crop and a depth of10~20 cm from the soil surface while drip-tape is aligned close to the maize row.

关键词： Drip-tape irrigation Maize Precision agriculture Root development soil water content distribution

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