Abstract
Effects of different levels of water deficit applied during rapeseed crop development were assessed in a trial with metallic pots in greenhouse at the Department of Agricultural Engineering of Kassel University, Witzenhausen, Germany. A randomized block design was used with one cultivar (Ability Summer Rape) and three levels of water deficit (0, 30, and 60% of evapotranspiration) in three treatments and 20 replicates. Irrigation management was carried out through daily water balance, where ET = I - D; ET: evapotranspiration; I: irrigation; and D: drainage. The following evaluations were carried out weekly: stem diameter (mm); plant height (cm); number of leaves; number of branches and number of pods. At the end of the experiment, assessed total green matter (g plant-1), total dry matter (g plant-1), grain yield (g plant-1), grain protein content (%) and grain oil content (%) were also assessed. Data were submitted to variance analysis and the effect of the treatments was assessed by regression analysis. Results showed significant differences between the treatments in all analysed variables except for plant height and grain protein content, by test F at 5% probability. Factor of response ky, indicator of crop sensitivity to water deficit, was lower than one for all assessed variables. Grain yield showed the highest sensitivity to water deficit.
Highlights
Water shortage in some regions of the world (RIJSBERMAN, 2006; KHAN et al, 2009) definitely increases interest in carrying out studies on development of crops showing acceptable yield under water deficit (ZWART; BASTIAANSSEN, 2004; FARRE; FACI, 2006; PAYERO et al, 2006; SINAKI et al, 2007)
Deficit irrigation is performed differently from supplementary irrigation, as in deficit irrigation we reduce depth of application while irrigation frequency is maintained
The objective of this study was to assess the effect of different levels of water deficit applied during rapeseed crop development on vegetative parameters, grain yield, grain protein content and grain oil content of rapeseed, Hybrid Ability
Summary
Water shortage in some regions of the world (RIJSBERMAN, 2006; KHAN et al, 2009) definitely increases interest in carrying out studies on development of crops showing acceptable yield under water deficit (ZWART; BASTIAANSSEN, 2004; FARRE; FACI, 2006; PAYERO et al, 2006; SINAKI et al, 2007). Understanding the behaviour of every crop, regarding different amounts of applied water, is absolutely necessary to determine when lack or excess of water may cause production fall, enabling appropriate irrigation management (BERNARDO et al, 2006). Local studies on the relationship between fall of relative yield and relative deficit of evapotranspiration are recommended (GEERTS; RAES, 2009), as production conditions during crop cycle depend on the place and variety chosen (DOORENBOS; KASSAN, 1994). Supplementary irrigation aims at meeting crop water requirements during critical development stages without natural precipitation (ZHANG et al, 2006).
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