ANBAR JOURNAL OF AGRICULTURAL SCIENCES

Abstract

Three field experiments were conducted on a fields at Babylon Governorate in a silty clay loam soil to study the effect of integrated (combined application of mineral and organic-bio fertilizers under different irrigation systems (furrow, micro-sprinkler ,and drip irrigation) on fertilizers productivity and nutrients use efficiencies . 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 combined fertilizer application (100% rate of mineral fertilizers +organic +bio) gave the highest tuber yield with 39.5 ,44.2,and 49.2 Mg ha-1 for furrow ,micro sprinkler and drip irrigation methods respectively.
Mineral fertilizer (100%) increased tuber yield by 38, 47, and 49% compared to the control treatment (0 mineral) for furrow, sprinkler and drip irrigation systems respectively. Fertilizers productivity (Agronomic efficiency for mineral fertilizer alone were 16, 21,and 29 Kg tuber yield Kg-1 fertilizer applied .Nitrogen use efficiencies (NUE) were 18, 25, and 32% and phosphorus use efficiencies (PUE) were 10,15, and 20% for furrow, sprinkler and drip irrigation systems respectively.
Bio fertilizer application or organic fertilizer application or both (as main effects) increased total tuber yield by (32.9, 56.0, 78.8%), (29.3, 84.6, 129.0%) and (27.6, 46.5, 64.7%) compared to control (with no bio or organic) for furrow, sprinkler, and drip irrigation experiments, respectively. Organic fertilizer .
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.