Many vineyards could be faced severe drought in the growing season. Above is a vineyard at Marlboro in March 2019. Marlboro experienced its first major drought in the last 40 years, from late last year to early March. Restriction of water absorption suppresses the physiological activity of plants. The value of the soil moisture sensor is sometimes used as an indicator for irrigation scheduling, but the value varies greatly depending on where the soil moisture sensor is buried and to what depth it is buried. The restriction of water absorption suppresses the physiological activity of plants. The sap flow sensor is able to provides an accurate grasp of the water stress conditions that the plant is faced, allowing you to design an optimal irrigation control algorithm.