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Abstract
The effect of integrated use of organic and inorganic fertilizers on the yield of potatoes was evaluated in a field experiment at newly reclaimed sandy soil at El-Khatataba Region, El-Monofia Governorate-Egypt, during two successive years (growing seasons of winter 2011/2012 and 2012/2013). The organic sources used were farmyard manure, poultry manure and compost. These organic sources were integrated in different proportions with mineral nitrogenous fertilizer as ammonium nitrate to supply 120 kg Nfed-1. All organic fertilizers were applied at planting time, whereas mineral fertilizer (ammonium nitrate) was applied at 4 doses; the 1st one was added 15 days after planting and the other ones were applied at 15 days intervals. The three treatments of foliar spray fertilizer, zero foliar spray, amino acid (AA) and humic acid (HA) were applied at two rates at 35 and 50 days from planting date. The results showed that, integrated use in different proportion increased the plant height, number of stems, total chlorophyll, chemical composition of potato tubers, also specific gravity, Carbohydrate protein content. However, mineral nitrogen fertilizer individually gave higher values compared with the integrated organic and mineral nitrogen fertilizers. However, the maximum and minimum values of potato yield and nitrate content in potato tuber, respectively were obtained by application of poultry manure combined with mineral nitrogen fertilizer and organic nitrogen individually