Dataset: irrig_corn.dat Source: D.D. Steele, E.C. Stegman, and R.E. Knighton (2000). "Irrigation Management for Corn in the Northern Great Plains, USA," Irrigation Science, Vol19, pp.107-114. Description: Irrigation water requrements and corn grain yields over 6 seasons on 4 quadrants with 4 irrigation scheduling techniques. Seasons: 1=1990, ..., 6=1995 Quadrants: 1=SW, 2=SE, 3=NE, 4=NW Irrigation scheduling techniques: 1 = Irrigated when tensiometer @ 0.30m reached 40 kPa and/or CWSI=0.25 2 = 60-70% depletion of water before first irrigation...then 60-70% to maturity 3 = same as 2, with 80% depletion: Smaller irrigations more often than 2 4 = Irrigation when CERES-maize model predicts 60-70% depletion Variables/Columns Season (Year) 8 Quadrant 16 Scheduling technique 24 Irrigation water amount 28-32 Corn Grain Yield 34-40 Season1 47-48 /* 1990=1, 1995=-1, others=0 */ Season2 55-56 /* 1991=1, 1995=-1, others=0 */ Season3 63-64 /* 1992=1, 1995=-1, others=0 */ Season4 71-72 /* 1993=1, 1995=-1, others=0 */ Season5 79-80 /* 1994=1, 1995=-1, others=0 */ Quad1 87-88 /* SW=1, NW=-1, others=0 */ Quad2 95-96 /* SE=1, NW=-1, others=0 */ Quad3 103-104 /* NE=1, NW=-1, others=0 */ Schedule1 111-112 /* S1=1, S4=-1, others=0 */ Schedule2 119-120 /* S1=1, S4=-1, others=0 */ Schedule3 127-128 /* S1=1, S4=-1, others=0 */ Carryover1 135-136 /* 1 if S1 in previous season, -1 if S4, 0 ow */ Carryover2 143-144 /* 1 if S2 in previous season, -1 if S4, 0 ow */ Carryover3 151-152 /* 1 if S3 in previous season, -1 if S4, 0 ow */