Abstract
Many areas along the west side of the San Joaquin Valley of California are affected by saline soil due to shallow, saline ground water conditions. Artificial subsurface drainage is not an option for addressing the salinity problem because of the lack of drainage water disposal facilities. Thus, the salinity/drainage problem of the valley must be addressed through improved irrigation practices such as converting to drip irrigation. The effect of drip irrigation on processing tomato yield and quality, soil salinity, soil water content, and water table depth was evaluated in four commercial fields located in the San Joaquin Valley of California, USA. Results showed drip irrigation of processing tomatoes to be highly profitable under these conditions compared to sprinkle irrigation. No trend in tomato yield was found with soil salinity levels. While a water balance showed little or no field-wide leaching, soil salinity data clearly showed localized leaching around the drip lines.
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