TY - JOUR AU - Golik, Silvina AU - Chamorro, Adriana M. AU - Bezus, Rodolfo AU - Pellegrini, Andrea AU - Voisin, Axel PY - 2022/08/25 Y2 - 2024/03/29 TI - Efficiency of water use in different sequences of crops and fallows in Argentina JF - Agronomía Mesoamericana JA - Agron. Mesoam. VL - 33 IS - 3 SE - Articles DO - 10.15517/am.v33i3.49282 UR - https://revistas.ucr.ac.cr/index.php/agromeso/article/view/49282 SP - 49282 AB - <p><strong><span class="CharOverride-2">Introduction.</span></strong>&nbsp;Water is the most limiting factor in the production of extensive rainfed crops in the Pampas region of Argentina and in many parts of the world.&nbsp;<strong><span class="CharOverride-2">Objective.</span>&nbsp;</strong>To determine the water use efficiency, both in grain yield and in total biomass produced, for different crop sequences under different fallow managements.&nbsp;<span class="CharOverride-2"><strong>Materials and methods.</strong>&nbsp;</span>The trial was carried out in the Experimental Station of the Facultad de Ciencias Agrarias y Forestales, J. Hirschhorn (34 ° 52´ LS, 57 ° 58´ LO), La Plata, Buenos Aires, Argentina, where since 2011 four crop sequences have been working and from 2015, in the period between summer crops, different treatments were implemented that included the use of cover crops with and without fertilization in the successor crop and the application of compost. During the period 2015 - 2018, total biomass produced, yield, and water use efficiency were determined.&nbsp;<span class="CharOverride-2"><strong>Results.</strong>&nbsp;</span>The sequence oats (<em><span class="CharOverride-5">Avena sativa</span></em>&nbsp;L.) / soybean (<span class="CharOverride-5"><em>Glicine max</em>&nbsp;</span>L.) 2nd - corn (<em><span class="CharOverride-5">Zea mays</span></em>&nbsp;L.) - sunflower (<span class="CharOverride-5"><em>Helianthus annuus</em>&nbsp;</span>L.) - wheat (<em><span class="CharOverride-5">Triticum aestivum</span></em>&nbsp;L.) was the most efficient in the use of water. In the last place, the sequence wheat / soybean 2nd-soybean-soybean-wheat was found, with the highest frequency of the soybean crop. The different types of fallows affected the water use efficiency, with less efficient values under the control treatment.&nbsp;<span class="CharOverride-2"><strong>Conclusion.</strong>&nbsp;</span>The crop sequences analyzed showed differences in water use. The fallows with cover crops and compost were more efficient in water use by 10,85 % on average of grain, and in 3,64 % on average of biomass.</p> ER -