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۱Efficiency of Some Organic Fertilizers as Safe Resources on the Performance of Valencia Orange Trees Grown in Newly Reclaimed Soils
اطلاعات انتشار: World Applied Sciences Journal، بيست و پنجم،شماره۹، ۲۰۱۳، سال
تعداد صفحات: ۷
This study was conducted during 2011and 2012 seasons on Valencia orange trees grown in newly reclaimed soil. Uniform trees at 12 years old budded on Volkamer lemon rootstock were selected and treated with three organic compost sorts i.e. Farmyard Manure (FM), Town Refuse (TR) and Sewage Sludge (SS) at 20 or 30% and\or natural extract of seaweed fungi (SW) at 25 or 50g\tree. Concerning the effect of compost sorts, results showed that sole application of farmyard manure followed in descending order by sewage sludge at 30% had improved leaf mineral contents, chlorophyll content, relative water content, fruit quality as well as total yield followed by Sewage Sludge. Using either farmyard or sewage sludge at 30%+25g seaweed extract revealed higher chemical constituents and yield values during both seasons. The best results were significantly obtained as seaweed extract at 50g\tree was combined with FM treatment followed by SS + 50g SW extract as compared with the other treatments. In addition, using composts at 20 or 30% in combinations with seaweed extract at 50g\tree gave higher values with non significant differences between them for every compost sort. The highest values were obtained as FM at 20 or 30% was used. Applying 20 or 30% compost + 50g seaweed recorded highest results with non differences between them. This means that using 50g seaweed extract + FM or SS compost sort at 20% \tree was sufficient for improving tree nutritional status, leaf chlorophyll content, fruit quality and total yield as well as useful in saving compost cost and reducing pollutions of chemical fertilizers.
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