Greater Sensitivity to Drought Accompanies Maize Yield Increase in the U.S. Midwest

Author:

Lobell David B.1,Roberts Michael J.2,Schlenker Wolfram3,Braun Noah4,Little Bertis B.5,Rejesus Roderick M.4,Hammer Graeme L.6

Affiliation:

1. Department of Environmental Earth System Science and Center on Food Security and the Environment, Stanford University, Stanford, CA 94305, USA.

2. Department of Economics, University of Hawaii at Manoa, Honolulu, HI 96822, USA.

3. School of International and Public Affairs, Columbia University, New York, NY 10027, USA.

4. Department of Agricultural and Resource Economics, North Carolina State University, Raleigh, NC 27695, USA.

5. Department of Mathematics, Office of the Provost, and Division of Academic Affairs, Tarleton State University, Stephenville, TX, USA.

6. The University of Queensland, Queensland Alliance For Agriculture and Food Innovation, Brisbane, Qld 4072, Australia.

Abstract

Predicting Responses to Drought The U.S. Corn Belt accounts for a sizeable portion of the world's maize growth. Various influences have increased yields over the years. Lobell et al. (p. 516 ; see the Perspective by Ort and Long ) now show that sensitivity to drought has been increasing as well. It seems that as plants have been bred for increased yield under ideal conditions, the plants become more sensitive to non-ideal conditions. A key factor may be the planting density. Although today's maize varieties are more robust to crowding and the farmer can get more plants in per field, this same crowding takes a toll when water resources are limited.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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