Effect of Irrigation Water Salinity and Iron Fertilizers on Soil Salinity, Growth and Yield of Cucurbita pepo (L.)

Hadi Yasir Abbood Al- Janabi


This study was conducted in the horticulture field , college of Agriculture, University of Al-Qasim Green, during the spring season of 2014 in loamy soil under drip irrigation system to study the effect of two levels ( 1.4 , 4 dS.m-1 ) of irrigation water salinities and methods of application of two sources of iron fertilizers on soil salinity , some growth parameters , yield and percentage of response to iron by Cucurbita pepo (L ). ,  and iron availability in surface soil . Chelate - Fe EDDHA (6%Fe), and FeSO4.7H2O(20%Fe) iron fertilizer sources were used in this study. Each fertilizer source was applied at a rate of 10 kg Fe.ha-1 by soil application at two equal doses ; first dose was after two weeks from transplanting and other dose is after six weeks; and by foliar application: Fe – EDDHA and FeSO4.7H2O fertilizers were sprayed on the plants at six times, the first was after two weeks from transplanting and the others were at week intervals from transplanting.Organic manure at a rate of 16 ton.ha-1 was added to the soil two months before transplanting. Urea was added to the soil at a rate of 400 Kg.ha-1 with four equal doses through the growing season while Di ammonium Phosphate (DAP) at a rate of 200 Kg.ha-1 and Potassium sulfate at a rate of 200 Kg.ha-1 were added to the soil before transplanting. Split – split plot design with three replicates was used. Results of the study can be summarized as follows:Soil salinity and available soil – Fe concentration after harvest were increased by 82% , 6% and chlorophyll content , plant - Fe , dry matter ,yield were decreased by 20% , 13% , 43% , 22% respectively with increasing irrigation water salinity from 1.4 to 4 dS.m-1. High response for soil applications of iron compared with foliar applications and for chelated iron fertilizer compared with mineral iron fertilizer was observed.

Keywords: water quality  ,  Iron availability.

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ISSN (Paper)2224-7181 ISSN (Online)2225-062X

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