Pedological Drought Influence on Water Use Efficiency in Sunflower, Oradea 2009-2011
Natural Resources and Sustainable Development, 2012
6 Pages Posted: 8 Dec 2015
Date Written: December 7, 2015
The researches were carried out during 2009-2011 in the research field for soil water balance study placed on the preluvosoil from Agricultural Research and Development Staton Oradea. Pedological drought is defined by the decrease of the soil water reserve on watering depth bellow easily available water content; in unirrigated sunflower pedological drought was determined every year of the studied period: 107 days in 2009, 19 days in 2010 and 97 days in 2011. Strong pedological drought was determined in 2009 (31 days) and in 2011 (20 days). Maintaining the soil water reserve on watering depth between easily available water content and field capacity need to use the irrigation rates of 3200 m3/ha in 2009, of 450 m3/ha in 2010 and of 3050 m3/ha in 2011; pedological drought registered in the unirrigated sunflower determined smaller values of the daily water consumption in comparison with irrigated variant; the biggest differences were registered in July: 60% in 2009; 18% in 2010 and 60% in 2011. As consequence, total water consumption of the sunflower in the irrigated variant increased in comparison with unirrigated variant with 70% in 2009, with 14% 2010 and with 46% in 2012; pedological drought determined the yield losses very significant statistically every year: 2050 kg/ha (51%) in 2009, 810 kg/ha (37%) in 2010, 2150 kg/ha (51%) in 2011; water use efficiency decreased under the pedological drought influence, the differences registered in comparison with irrigated variant were of 15% in 2009, of 6% in 2010 and of 13% in 2011.
The results researches emphasize the need of the sunflower irrigation in the conditions of the moderate wet area of the Crisurilor Plain.
Keywords: pedological drought, strong pedological drought, irrigation, water use efficiency, sunflower
JEL Classification: A10
Suggested Citation: Suggested Citation