EFFECTS OF PHOSPHOGYPSUM, IRRIGATION WATER SALINITY, OTTON CULTIVARS AND INTERACTION AMONG THEM ON AVAILABILITY AND UP-TAKE OF NPK IN SOIL AFFECTED WITH SALINE.

	EFFECTS OF PHOSPHOGYPSUM, IRRIGATION WATER SALINITY, OTTON CULTIVARS AND INTERACTION AMONG THEM ON AVAILABILITY AND UP-TAKE OF NPK IN SOIL AFFECTED WITH SALINE.
Euphrates Journal of Agriculture Science
Article 1, Volume 5, Issue 4, 2013, Pages 176-187
Abstract
ABSTRACT: A field experiment was conducted in a silty-loam soil in AL-Saqlawia district, 40 kilometer east the city of Ramadi in season 2012, to study the effects of phosphogypsum, Irrigation water salinity, cotton cultivars and the interaction among them on availability, and aup-take of NPK in soil affected with saline. Split–split plots design with RCBD was used. Irrigation treatments(W) occupied the main plots. cotton cultivars(C) took sub–plots. phosphogypsum Levels (GP) was under the secondary plots sub–sub plots. available and up-take NPK measured in soil and plant .The results showed that: Addition of phosphogypsum achieved a significant increase available N,P and K in soil and up-take them in plants with an increase rate of available N; 10.40 and 19.73% and with up-take N; 16.48 and 34.62%. available P; 34.50 and 58.84%, up-take P; 11.76 and 17.64%. available K; 5.19 and 14.34%, up-take K; 25.56 and 13.91% .for addition of 3 and 6 t.ha-1 of phosphogypsum respectively for the control. Irrigation water salinity affected significantly increased available N,P and K in soil by increased irrigation water salinity, and achieved an increase rate of three nuterents respectively at 36.35 and 19.40% and 16.86 and 11.01% and 7.00 and 3.38% for both irrigation with drainage water and alternatively irrigation, respectively compared to irrigation with river water. And also Irrigation water salinity affected significantly increased up-take P,K, in plants by increasing irrigation water salinity, and achieved an increase rate of two nuterents respectively at 8.57 and 5.71% and 15.21 and 15.06% for both irrigation with drainage water and alternatively irrigation ,respectively compared to irrigation with river water. Cokerwelt310 surpassed significantly than Lashata in the increasing uptake P and K in plants to reach the rate 5.26% and 4.97% for two nuterents respectively .

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