Cotton production as affected by irrigation intervals, nitrogen and potassium fertilization in the newly reclaimed soil of west Nubaria region [electronic resource].

Includes references.

Two field experiments were conducted at the Research Farm of Nubaria Agric. Res. Stn. during 1998 and 1999 summer seasons to study the effect of two irrigation intervals (I1, = 14 days and I2 = 14-28 days), three nitrogen (N1 = 50, N2 = 75 and No= 100kg Nlfed) and three potassium (K, = 24, K2 = 48 and K3 = 72kg K2O/fed) fertilization levels on seed cotton yield, yield components, fiber quality, water consumptive use (WCU) and water use efficiency (WUE) and to develop crop-coeffiCient curve (Kc) for extra-long staple cotton cultivar Giza 70 grown under calcareous soils conditions at west Nubaria region. A split split-plot design with three replicates was used. Results indicated that plots irrigated every 14-28 days (I2 irrigation interval) recorded higher boll weights (2.44, 2.08g), seed cotton yield/plant (28.92, 25.75g), seed cotton yield/fed (7 .31, 5.51 kentar), lower number of damaged bolls/plant (4.51, 6.64) and earlier maturity of cotton plants (earliness indices of 74.92, 65.46%) as compared to the 14d (I1)treatment for the 1998 and 1999 seasons, respectively. Irrigating every 14-day resulted in higher lint percentage (39.43, 40. 33%) and finer fibers (micronaire readings of 3.25 and 3.51) as compared to I2 treatment for the same two seasons, respectively. Water use efficiency values increased with alternating irrigation (I2 treatment). Average WUE values for I1 and I2 irrigation treatments were 0.34 and 0.42 kg seed cotton yield/m3 consumed water, respectively.

Summary in Arabic.

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