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Transition to Dryland Agriculture

Limited Irrigated vs. Dryland Corn

Southwest Res. Ext. Cent., 4500 E. Mary, Garden City, KS 67846

View larger version (49K): [in a new window]   Fig. 1. Effect of hybrid and irrigation on kernels ear-1 and kernel weight of corn, Garden City, KS, 1998–2000. Data are averaged across plant populations. Numbers within graphs are the LSD(0.10) for hybrid (H) and irrigation (I). H1 = 104-d maturity and H2 = 116-d maturity. Irrigation rates of 0, 150, and 300 mm refer to dryland, one irrigation, and two irrigations in the text.

View larger version (44K): [in a new window]   Fig. 2. Effect of hybrid and plant population on kernels ear-1 and kernel weight of corn, Garden City, KS, 1998–2000. Data are averaged across irrigations. Numbers within graphs are the LSD(0.10) for hybrid (H) and plant population (P). H1 = 104-d maturity and H2 = 116-d maturity.

View larger version (47K): [in a new window]   Fig. 3. Effect of irrigation and plant population on kernels ear-1 and kernel weight of corn, Garden City, KS, 1998–2000. Data are averaged across hybrids. Numbers within graphs are the LSD(0.10) for irrigation (I) and plant population (P). Plant populations for P1 and P2, respectively, were 40000 and 65000 in 1998, 45000 and 68000 in 1999, and 48000 and 73000 in 2000. Irrigation rates of 0, 150, and 300 mm refer to dryland, one irrigation, and two irrigations in the text.

View larger version (39K): [in a new window]   Fig. 4. Returns from limited irrigated and dryland corn as affected by hybrid maturity, irrigation, pumping cost ($ mm-1) and corn price ($ kg-1), Garden City, KS, 1998–2000 average. Irrigation rates of 0, 150, and 300 mm refer to dryland, one irrigation, and two irrigations in text.