Abstract
A study to investigate the effect of integrated mineral and cattle manure fertilizers on grain yield of Barley (Hordium Vulgar L.) was evaluated during 2013 and 2014 main cropping season on vertisols of southern Tigray Ethiopia. The treatment consists four level of N/P205 fertilizer combination (0/0, 23/23, 46/46, 69/69 kg ha-1) and five levels of farm yard manure (0, 4, 6,8,10 ton ha-1) and their interactions arranged in Randomized Complete Block Design (RCBD) in three replication. The combined statistical analysis over locations revealed significant main effects of FYM and NP fertilizers (p ≤ 0.05) and interactions effects on grain yield of barley. There were also highly significance variation among N/P fertilizer main effect for biomass, physiological maturity, plant height, seeds per spike and effective tiller per plant, however no significance variation between the FYM main effects and interaction effects of NP and FYM for biomass, physiological maturity, plant height seeds per spike and effective tiller per plant. Grain yield consistently respond to increasing level of fertilizations in the form of NP, FYM or their integration. The results of this finding showed that combined application of 69/69 N/ P205 kg ha-1+ 10 ton ha-1 FYM, 69/69 N/P205 kg ha-1 + 8 ton ha-1 FYM and 69/69 N/ P205 kg ha-1 + 6 ton ha-1 FYM significantly (P<0.05) increase the yield of barley than other treatments. Integrated application of 46/46 N/P205 kg ha-1 with 8 t ha-1 gave 18 % and 100% yield increment than current (46/46 N/P205 kg ha-1) blanket fertilizer recommendation in the area and the control. This may greatly benefits farmers in area where supply of mineral fertilizer is low or cases where farmers can’t afford the cost of high fertilizer input. Higher grain yield (2.9 ton ha-1) was obtained from residual effects of 8 ton ha-1 FYM applied in 2013 on barley grain yields in 2014 cropping season received 46/46 kg ha-1 N/P205.
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