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SOIL WATER STORAGE AND MAIZE GROWTH AND DEVELOPMENT UNDER TWO TILLAGE SYSTEMS IN SOUTHERN OF BRAZIL
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Paper number 022185, 2002 ASAE Annual Meeting . @2002
Authors: Reimar Carlesso, Fernando Luiz Zimmermann, Mirta Teresinha Petry, Genesio Mario da Rosa, Fabiano Daniel De Bona, Jefferson Horn Kunz
Keywords: Tillage systems, soil water, maize, crop yield
The objective of this experiment was to determine modifications in crop canopy, grain
yield, soil water availability, plant available water and soil water extraction by maize plants submitted
to two water regimes and two tillage systems. Two experiments were conducted during 1999/00 and
2000/01 growing seasons in the experimental field of the Agricultural Engineering Department of the
Federal University of Santa Maria, RS, Brazil. A completely randomized design, factorial (2x2), was
used with four replications. Treatments were: (i) Factor A - two soil water managements (irrigated
and soil water deficit) and; Factor B - two tillage systems (conventional tillage and no-tillage).
Irrigations were applied to raise the soil water content to the upper limit of plant available always
when cumulative maximum crop evapotranspiration (ETm) reached a value of 25 mm. Maize plants
submitted to water deficit did not received any application of water through irrigation or rainfall after
27 days after emergency (DAE), 7th leaf fully expanded.