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• Grower's Guide: Using PET for Determining Crop Water Requirements and Irrigation Scheduling
• Texas Historical average PET and rainfall per month
• Irrigation Scheduling Methods (Univ. of Georgia)
• Irrigation Scheduling to Improve Water- and Energy-Use Efficiencies (North Carolina State Univ., PDF)
• Estimating Soil Moisture by Feel and Appearance (High Plains Underground Water District No. 1, PDF)
• Soil Moisture Monitoring: An Overview of Monitoring Methods and Devices (High Plains Underground Water District No. 1, PDF)
• Estimating Soil Moisture by Appearance and Feel (Univ. of Nebraska)
• Soil Water Measurements: An Aid to Irrigation Water Management (Kansas State Univ., PDF)
• Scheduling Irrigation by Electrical Resistance Blocks (Kansas State Univ., PDF)
• Tensiometer Use in Scheduling Irrigation (Kansas State Univ. PDF)