WATER USE EFFICIENCY UNDER MINERAL AND ORGANIC- BIO FERTILIZERS OF POTATO

Ali, N.S.; Al - Jutheri, H.W.

	WATER USE EFFICIENCY UNDER MINERAL AND ORGANIC- BIO FERTILIZERS OF POTATO
The Iraqi Journal of Agricultural Science
Article 1, Volume 42, Issue 0, 2011, Pages 138-149
Authors
N.S. Ali; H.W. Al - Jutheri
Abstract
Three field experiments were conducted on a fields at Babylon Governorate in a silty clay loam soil to study the effect of integrated application of mineral and organic-bio fertilizers under different irrigation systems (furrow , sprinkler , and drip irrigation) on potato tuber productivity and water use efficiency ( WUE) .Treatments included three rates of mineral fertilizers 0,50,and 100% of (300 KgN.ha-1+100 Kg P. ha-1) ,10 Mg ha-1 organic fertilizer (organo fert.), 950 Kg ha-1 bio fertilizer(Al-Muaferbio), organic+ bio fertilizers, and control treatment(without neither organic nor bio.). Results indicated that 100% rate of mineral fertilizers +organic-bio gave the highest tuber yield and and WUE. Mineral fertilizer (100%) increased tuber yield by 38,47, and 49% compared to the control (0 mineral) for furrow, sprinkler and drip irrigation systems respectively. Besides, this treatment (100% rate of mineral fertilizer) resulted in WUE of 7.17, 10.81, and 24.39 Kg m-3 for furrow, sprinkler and drip irrigation systems, respectively.Organic fertilizer , bio fertilizer and bio +organic fertilizers increased tuber yield productivity by (32.9,56.0,&78.8% ),(29.3,50.3,&73.8% ) and (27.6,46.5,&64.7%) for furrow, sprinkler and drip irrigation systems , respectively. Furthermore, Bio + 50% mineral fertilizer or organic fertilizer application gave potato tuber yield similar to 100% rate of mineral fertilizer. Therefore, it can be concluded that bio or organic fertilizers can partly substitute mineral fertilizers.

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