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The present study was carried out during the two successive summer seasons of 2016 and 2017, at private farm in Kafr El-Sheik Governorate, under clay loam soil condition using furrow irrigation system. These experiments aimed to evaluate the effect of some combinations between four levels of mineral fertilizer with two types of organic fertilizer produced from biogas digester system (dried and liquid residuals) as well as farmyard manure beside the control treatment on growth, yield and fruit quality of sweet pepper (Capsicum annum L.) cv.California wander as a local famous variety, grown under open field conditions. All organic sources gave rise to a positive effect on plant growth expressed as plant height, number of branches per plant, number of leaves per plant, leaf area per plant, foliage fresh weight and foliage dry weight per plant and increased the percentage of essential macro and micro elements in pepper plant leaves, also produced the highest values of early and total yield and enhancing the fruit quality. Moreover, it increased TSS and ascorbic acid in the fruits as compared with those plants fertilized with mineral NPK alone without organic sources (control). In this concern, dried biogas residual organic fertilizer was the superior source of organic fertilizer, used in this study, which it showed the highest results comparing with the other sources i.e., liquid biogas residual organic fertilizer or farmyard manure. In pepper plants, increasing NPK rate from 25% to 100% of the recommended dose led to an increase in plant vegetative growth. Moreover essential macro and micro elements were increased also in plant leaves. Likewise, early and total yield and the fruit quality i.e., physical fruit quality TSS and vitamin C were enhanced. The promising combination was 50% from the recommended NPK plus 20 m dried biogas digester residual organic fertilizer, which gave the best values of plant growth and yield, also fruit characters were enhance.Concerning the economical evaluation, adding the 50% of recommended NPK combined with 20 m dried biogas digester residual organic fertilizer led to obtain the highest total yield of pepper plants as well as total revenue as compared with the other treatments under this investigation.

journal of plant production

Evaluation of Using Organic Fertilizer Produced from Biogas Digester under Levels from Mineral Fertilizer Recommendation of Pepper Plants on the Growth, Yield and its Quality