Kassab, M.M.( 2012). Maize Water Parameters under Cut-Off IrrigationMinufiya J. Agric. Res. Vol.37 No. 6(2):1529-1539 (2012
Abstract: : A field trial was conducted during the two successive summer seasons 2010and 2011at Sakha Agricultural Research Station, Kafr El-Sheikh Governorate to find out the effect of irrigation length on maize grain yield and its water parameters. Five irrigation length were examined; 100% of strip length (S.L) as control (Trt. A), 95 %(Trt. B), 90% S.L(Trt. C), 85% S.L(Trt. D) and 80% S.L (Trt. E).
The main findings could be summarized as follows:
- Mean values of seasonal water applied for the two seasons can be ranked in descending order as; A(2956.0) > B (2823.3) > C(2683.2) > D(2571.0) > E(2432.2) m3 fed-1. Comparing with water applied to the traditional treatment A, average water saving in the two growing seasons by using 95 % and 90% S.L for watering maize could be amounted with 132.72 and 272.82 m3 or 4.5 and 9.3%. Average, water saving might be equaled more than 0.4 billion m3 for the maize national cultivated area (2.0 * 106 )fed.
- Average crop-water consumption could be arranged in descending order as; A(64.39) > B(61.62) > C(58.77) > D(56.90) > E(54.26) cm. The corresponding rates of CU were; 5.6, 5.4, 5.1, 4.9 and 4.7 mm day-1 for the same treatments, respectively.
- The main values of consumptive use efficiency ranged between 91.0 to 93.5% for different treatments.
- Significant differences were found among the studied treatments regarding grain yield as well as 100 grain weight, ear length and ear diameter.
- The highest grain yield 3771.3 kg. fed-1 (26.94 ardab. fed-1 ) and 3648.0 kg. fed-1 (26.1 ardab. fed-1 ) were scored with 95% cut off (Trt. B) and 90% cut off (Trt. C)of the cultivated maize strip, respectively.
- The highest average of yield per unit of applied water or water utilization efficiency (W Ut E) as well yield per unit consumed water or water use efficiency (W U E) averaging 1.36 and 1.48 kg m-3 were obtained under 90% S.L (Trt C).
Keywords: (Cut off irrigation, Water saving, crop-water efficiencies )
