Document Type : Research articles.
Authors
Soil, Water and Environmental Res. Inst., A.R.C., Egypt
Abstract
Field experiments were carried out at Fayoum Agric. Res.
Station (Tameia) during 2008 and 2009 seasons to study the
combination effects of three sowing dates, i.e. D1:1st June, D2:10th
June and D3: 20th June and three irrigation scheduling treatments
according to cumulative pan evaporation (C.P.E), i.e. (I1):0.8,
(I2):1.0 and (I3): 1.2 on yields, yield components, and some water
relations of maize hybrid (TWC 310). A split- plot design with four
replications was used. The main results obtained were as follows:
1. Grain yield/fed, yield components were significantly affected
by sowing dates and irrigation scheduling treatments in both
seasons. Sowing on 1st June and irrigation at 1.2 C.P.E (I3)
gave the highest averages of stem diameter, ear length, ear
diameter, grain weight/plant and 100-grain weight in both
seasons. Nevertheless, third sowing date (D3) and irrigation at
0.8 C.P.E (I1) gave the lowest yield component averages in both
seasons.
2. The highest grain yield, i.e. 2476 kg grains/fed was detected
from (D1I2) in the first season, and 2857 kg grains/fed from
(D1I3) in the second season. On the contrary, third sowing date
(D3) and irrigation at0.8 C.P.E (I1) gave the lowest grain
yield/fed, i.e. 1955 and 1414.10 kg grains/fed in 2008 and 2009
seasons, respectively.
3. Seasonal consumptive use (ETC) averaged 61.69 and 61.35 cm
in 2008 and 2009 seasons, respectively. The highest ETC
values, i.e. 69.35 and 68.91 cm were recorded from (D1I3) in
2008 and 2009 seasons, respectively, whereas, the lowest
values, i.e. 54.1 and 53.15 cm in the two successive seasons
were resulted from (D3I1).
4. The daily ETC rates were low during June, and tended to
increase during July to reach its peak during August and then
declined during September and October in both seasons. the
crop coefficient (KC) values, for high grain yield were 0.44,
0.70, 1.06, 0.67 and 0.63 for June, July, August, September and
October, respectively(as an average in two seasons)
5. The highest water use efficiency, i.e. 0.896 and 0.987 kg
grain/m3 water consumed were obtained from (D1I2) and (D1I3)
treatments in 2008 and 2009 seasons, respectively
Keywords
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