MAIZE HYBRIDS AS INFLUENCED BY DROUGHT STRESS UNDER DRIP IRRIGATION AT NUBARIA REGION | ||
| Journal of Plant Production | ||
| Article 7, Volume 27, Issue 4, April 2002, Pages 2041-2052 PDF (3.59 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2002.253958 | ||
| Authors | ||
| K. I. Khalifa,1; G. M. A. Mahgoub1; A. M. Tarrad2 | ||
| 1Maize Res. Program, Field Crops Res. Inst., ARC, Egypt. | ||
| 2Crop Physiology Res. Sec., Field Crops Res. Inst., ARC, Egypt. | ||
| Abstract | ||
| A field experiment was conducted in sandy soil under drip irrigation at Aly Mubarak Res. Farm, Nubaria during 2000 and 2001 growing seasons to study the effect of two water irrigation treatments, i.e. 100 and 50% of the evaporated water column from the evaporation pan on yield and yield components, growth characters, relative water content (RWC), and leaf proline content (LPC) of four maize hybrids, i.e. SC.122 (W), SC.129 (W), SC.155 (Y), and SC.161 (Y). The two water treatments represent well watered (non-stressed) and water stressed environments. Results cleared significant differences between the two stress levels for all studied traits except for ear diameter, No. of rows/ear, and RWC in 2000 growing season, and for No. of days to mid silking and LPC in 2001 season. Also, significant differences were found among the four hybrids for all studied traits except for grain yield (both years), no. of ears/100 plants and RWC in 2001 season. Water stress resulted in 30.3-43.2% reduction in grain yield in 2000 season, and 11.6-20.0% in 2001 growing season. Reductions due to water stress in No. of ears/1 00 plants, ear length and diameter, No. of rows/ear, No. of kernels/row, 100-kernel weight, and plant height were 8.1- 20.8%, 9.1-14.3%, 0.7-4.5%, 1.4-3.7%, 13.1-23.6%, 6.4-12.8%, and 0.2-10.1%, respectively. RWC of plant leaves was lower under water stress than under normal irrigation by 5.5, 6.8, and 2.2% at 52, 62, and 90 days growth stage, as an average of the two years. Considerable changes in LPG occurred in plants under stress at the three plant growth stages especially at 62 days (flowering stage). LPG increased by 10.7, 41.1, and 19.9% at 52, 62, and 90 days as compared to values under normal irrigation. RWG and LPG at critical period of plant growth (flowering) may be used as indicators of drought stress of maize plants, but more investigations are recommended. | ||
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