تاثير انواع من السماد العضوي في نمو وانتاج وجودة ثمار اشجار الجريب فروت صنف مارش الاحمر

The present study was carried out during 2004, 2005 and 2006 on eight years-old trees of grapefruit var. Red Marsh budded on Sour Orange root stock. The orchard was selected in Agricultural Tartous Science Research Center, Citrus Research Section; the purpose of this work is to study the effect of different organic fertilizers on their growth, production and fruit quality. Four treatment fertilizers at equal total doses of N were applied, the treatment fertilizer was: control(0) (without any fertilizer), mineral fertilizer NPK(1:0.5: 0.8), cow manure (70Kg/tree/year), goat manure(65kg/tree/year), and seed olive residue(50kg + 400g N) /tree/ year, The data show that application of organic fertilizer increased available N content in the soil. The results also indicated that mineral fertilizer treatment gave the highest yield and growth followed by organic fertilizer which goat manure gave the best quality of fruit quality of fruit, as compared with other treatment.