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1

College of Agriculture, National University of La Pampa, Santa Rosa, L.P., Argentina

2

National Institute for Agricultural Technology, Experimental Station -Guillermo Covas-, Anguil, L.P., Argentina





*

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Abstract Rising demands for food and uncertainties about climate change call for a paradigm shift in water management with a stronger focus on rainfed agriculture. The objective here was to estimate water productivity of different crops under no-till NT and conventional till CT, in order to identify rotations that improve the water productivity of dryland agriculture. We hypothesized that NT and cereal crops would have a positive effect on overall water productivity. Crop yield and water use data were obtained from a 15 year experiment 1993 to 2008 on an entic Haplustoll in the semiarid Pampa, Argentina, with a rotation of wheat Triticum aestivum L., corn Zea mays L., sunflower Helianthus annus, and soybean Glycine max L. Merr

The results indicated an improved water productivity of all crops under NT compared with that of CT; however, the response of cereals corn +1.0 kg ha−1 mm−1, wheat +1.3 kg ha−1 mm−1 was higher than that of sunflower +0.3 kg ha−1 mm−1 and soybean +0.5 kg ha−1 mm−1. Crop type had a higher impact on water productivity than did tillage system. In agreement with our hypothesis, cereal crops were more efficient corn 9.8 and wheat 6.9 kg ha−1 mm−1 compared with soybean 2.4 and sunflower 3.9 kg mm−1, but the economic water productivity of sunflower 0.9 US$ ha−1 mm−1 almost equaled that of wheat 1.1 US$ ha−1mm−1 and corn 1.2 US$ ha−1 mm−1. We concluded that the use of the synergy between NT and water efficient crops could be a promising step towards improving food production in semiarid regions. View Full-Text

Keywords: water productivity; cereals; oilseeds; trade price; energy contents water productivity; cereals; oilseeds; trade price; energy contents





Autor: Elke Noellemeyer 1,* , Romina Fernández 1,2 and Alberto Quiroga 1,2

Fuente: http://mdpi.com/



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