In regions where water is scarce, both over-irrigation and under-irrigation compared to the crop's actual water needs directly impact crop performance. Efficient irrigation scheduling is crucial to boost crop production, maximize water use efficiency (WUE), and minimize environmental consequences such as water and nutrient losses through runoff and leaching. Monitoring soil water status via soil water tension (SWT) measurement is a key method for scheduling irrigation. SWT indicates the force needed for crop roots to extract soil moisture, providing valuable insight into soil moisture availability for irrigation scheduling. Various modern instruments, including tensiometers and sensors, enable precise measurement of SWT, either directly or indirectly. Numerous research studies have explored SWT threshold values to optimize crop performance, yield, and quality, particularly for vegetable crops grown across different regions worldwide. These threshold values play a crucial role in determining the timing, quantity, and duration of irrigation, facilitating the development of accurate irrigation schedules. This chapter delves into the intricacies of monitoring soil water status for irrigation scheduling, supplemented with relevant case studies.