Effects of deficit irrigation on some yield characteristics of sweet corn

Abstract

This study was made to determine the influence of deficit irrigation on drip irrigated sweet corn in 1998 and 1999 in Sanliurfa, Turkey. Water was applied to sweet corn as 100, 90, 80 and 70% of evaporation from a Class A Pan (E pan ). Applied irrigation water was 610-876 mm and 612-889 mm in 1998 and 1999, respectively. Plant height, ear length, number of kernels per ear and single fresh ear weight values were the highest at 100% E pan whereas the lowest values were found at 70% E pan in both the years. Water savings were 11.30, 20.89 and 30.36% in 1998 and 10.91, 21.14, 31.15% in 1999 for 90, 80 and 70% of E pan , respectively. The highest fresh ear yields (14.76 and 14.17 t ha -1 ) were obtained at 100% E pan , whereas minimum fresh ear yields (9.15 and 8.84 t ha -1 ) were found at 70% of E pan in 1998 and 1999, respectively. Despite the reduction of fresh ear yield, the number of marketable ears at 10% water deficiency (90% E pan ) was still high and acceptable for sweet corn production in the Harran Plain of Turkey.

Respuesta del Silk Balling a humedad edáfica y densidad de población en líneas de maíz

“…These results agree with those obtained by Eck (1986);Oktem (2008) who argued that water deficit significantly reduces yield, ear length, grain number and grain weight in maize. Furthermore, Cakir (2004) mentioned that, the highest yields under regular irrigation are obtained (100%); although this research was conducted with maize hybrids.…”

“…Estos resultados están de acuerdo a los obtenidos por Eck (1986) ;Oktem, (2008) quienes afirman que el déficit hídrico reduce significativamente el rendimiento, longitud de la mazorca, número de grano y el peso del grano en maíz. Por otro lado, Cakir (2004), menciona que se obtienen los rendimientos más altos bajo condiciones de riego normal (100%); aunque esta investigación se realizó en híbridos de maíz.…”

Response of Maize (Zea mays L.) Grain Yield and Yield Components to Irrigation and Nitrogen Fertilization

“…Geetha and Jayaraman (2000), Kumar and Kumar (2000), Mohan et al (2002) and Oktem (2008) have stated that GW have the most significant direct influence on maize GY, while Khazaei et al (2010) indicated that highly significant positive correlation was observed between GY and GN. As it is shown in table 9., in the first year our study very strong and positive correlation was between GY and GW (r=0.66), CW (r=0.77), CL (r=0.75) and GN (r=0.74).…”

“…Also, nitrogen fertilization increased cob number (CN), number of plants m 2 , 1000-grain weight (1000-GW) and grain number (GN) (Abbas et al, 2005). As for irrigation, significantly higher values for grain weight (GW), cob length (CL), plant height (Carpici and Celik, 2010;Istanbulluoglu et al, 2002;Dağdelen et al, 2008), CN plant -1 , CN m 2 , GN cob -1 and 1000-GW (Abbas et al, 2005.;Oktem, 2008) are obtained in fully irrigated plots compared to rainfed plots (control). Yield of maize grain is potentially correlated to yield components.…”

“…Khayatnezhad et al (2010) stated that the following yield components have the most significant direct influence on GY: leaf area index (LAI), leaf area (LA), CW, GN, CL, cob diameter (CD), 1000 GW and plant height (PH). Geetha and Jayaraman (2000), Kumar and Kumar (2000), Mohan et al (2002) and Oktem (2008) stated that GN*have the most significant direct influence on GY. According to some other research results strong, positive correlation was determined between the GY and the RN cob -1 (Agrama, 1996;Corke and Kannenberg, 1998;Manivanannan, 1998;Mohan et al, 2002), between the GY and CL (Mohan et al, 2002) and between the GY and CW (Kumar and Kumar, 2000).…”