Water-Yield Relationships in Deficit Irrigated Onion

Abstract

This trial was realized in the greenhouses of Uludağ University Yenişehir Vocational School between 2009 and 2010 to investigate effects of water deficit on yield and quality parameters of onion during four crop growth stages. In this trial, fourteen irrigation treatments in four growth periods (establishment, vegetative, yield formation and ripening) of onion (Allium cepa L E.T Grano.502) were constituted and the yield and quality parameters found from these treatments were evaluated. The layout of the experiment was a completely randomized block design with three replications for each of the fourteen irrigation treatments tested. According to the content of the treatments, the irrigation amount water applied to the plants varied between 0 and 436 mm in the first year, and between 0 and 448 mm in the second year. Water consumption of onion in the first year ranged between 205 and 496 mm and in the second year ranged between 210 and 502 mm. Yield, bulb weight, diameter, height and dry matter ratio were determined statistically significant. In 2009 and 2010 years, the maximum yield were found as 52.2 t ha-1 and 52.4 t ha-1 in E100V100Y100R100 treatments, while the minimum yield were found as 0.8 t ha-1 and 0.5 t ha-1 in the E0V0Y0R0 treatments, respectively. Water- yield relationship factors (ky) in 2009 and 2010 years were found as 1.03 and 1.04, respectively. The maximum WUE and IWUE values were obtained from establishment and ripening periods. Establishment and ripening periods may be suggested as the maximum efficient irrigation periods for the onion applied with drip irrigation under unheated greenhouse conditions.

Impact of Foliar Application with Salicylic Acid on Growth and Yield of Potato (Solanum tuberosum L.) under Different Irrigation Water Quantity

“…and 0.0 g/l salicylic acid gave the highest values, but the lowest values were recorded with 1300 m 3 / fed. and 0.3 g/l salicylic acidThese results coincide with those reported by Ayas and Korukcu (2010)…”

Deficit Irrigation Effects on Cabbage (Brassicaceae Oleracea var. capitata L. Grandslam F1) Yield in Unheated Greenhouse Condition

“…Any recommended value of K for regional irrigation scheduling program must be high enough to prevent water stress arising from emergencies and specialized local situations, while remaining low enough for efficient water management (Yuan et al, 2003). Based on the US Weather Bureau Class A pan evaporation, many studies have been completed on the irrigation of cabbage (Kiziloglu et al, 2008), broccoli (Ayas et al, 2011), tomato (Ayas, 2015); green bean (Büyükcangaz et al, 2008); pepper (Demirtas and Ayas, 2009), cucumber (Ayas and Demirtas, 2009), lettuce (Yazgan et al, 2008) and potato (Ayas and Korukcu, 2010;Ayas, 2013). Several studies have been performed to investigate the influence of different irrigation levels on cabbage growth and yield.…”

The Effect of Super-Absorbent Polymer and Sowing Depth on Growth and Yield Indices of Potato (Solanum Tuberosum L.) in Hamedan Province, Iran

“…Several studies showed that the percentage of dry matter of the tubers increases with decreasing irrigation, drought stress, and reducing yield (Ayas and Korukcu, 2010;Ayas, 2013;Porter et al, 1999). It seems that the reason for increasing dry matter percentage due to drought stress is to reduce the potential of water around the root and water deficit of the crop resulting in less water being directed to the tissues of the crop while the percentage of dry matter of the tubers increased (Bagheri et al, 2016).…”