Effect of Cattle Manure, Bio Fertilizers and Reducing Mineral Fertilizer on Nutrient Content and Yield of Potato Plant

摘要

THE PRESENT WORK was carriad out in newly reclaimed land at Sadat city,Taba farm, El-Menoufia governorate during 1998/1999 and 1999/2000 Potatoes var.Nicola was cultivated to study Effect of cattle manure,bio fertilizers and reducing mineral fertilizer on nutrient content and yield of potato plant. The results from this study indicated that percentages of N, P, K, Mg and Calcium were increased in potato leaves by reducing the mineral fertilizer of the recommended dose (300 kg rock phosphate and 150 kg N and 175 kg K2O) to half or quarter with bio fertilizer. Using biofertilizer with half or quarter of recommended dose of mineral fertilizer caused increasing in specific gravity of potato tuber. Adding biofertilizer alone increased dry matter contentin potato tuber. Whereas, this increment was not significant with application of the half or quarter of recommended mineral fertilizer dose and biofertilizer. Increasing in total carbohydrates was found by applying biofertilizer alone in potato tuber. Whereas, this increase was not significant with reducing the mineral fertilizer to half or quarter of recommended dose and biofertilizer. Applying the recommended dose of mineral fertilizer (check) compared with other treatments increased the nitrate content in potato tuber. Reducing mineral fertilizer to half or quarter of recommended dose with biofertilizer increased total yield per plant and per feddan.