الفهرس 
IntroductiionOnly 14 pages are availabe for public view
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Abstract
Two field experiments were carried out at the private farm in Basandela village, Belqas, Dakahlia Governorate, during the two successive winter seasons of 2003/2004 and 2004/2005. The objective of this experiment was to study the response of potato (Solanum tuberosum L.) cv. Spunta to organic manure sources, inorganic fertilizers and their interaction in the plant growth, yield and quality characters. The experimental design was randomized complete block design with three replicates in both seasons. The obtained results could be summarized as follows: 1- Vegetative growth characters: o Plant height, number of stems and leaves/plant, leaves area/plant, fresh and dry weight of leaves/plant, dry weight of stems/plant, chlorophyll (a), chlorophyll (b) and total chlorophyll in leaves were significantly affected by the application of 50 % chicken manure + 50 % NPK treatment as compared with other treatments in both seasons of study. 2- Yield and its components: o Total number of tuber at harvest/plant, total yield (t/fed) and marketable yield (t/fed) were significantly increased with the application of 50 % chicken manure + 50 % NPK treatment as compared with other treatments in both seasons of study. Unmarketable yield (t/fed) was significantly increased with the application of 50 % farmyard manure + 50 % NPK treatment in both seasons of study. The grading of tubers was not significantly affected with these treatments in both seasons of study. 3- Tuber qualities: o Total soluble solids percentage was not significantly affected by these treatments in both seasons of study. Crude protein as fresh (%), ascorbic acid content (mg/100 g) and starch content in tuber (%) were significantly increased with the application of 100 % NPK i.e. control treatment as compared with other treatments in both seasons of study. Dry matter of tubers (%) and specific gravity were significantly increased with the application of 100 % as compared with other treatments in both seasons of study. 4- Chemical composition: o N % in leaves, N % in tubers and P % in tubers were significantly affected by application of 50 % chicken manure + 50 % NPK treatment as compared with other treatments in both seasons of study. P % in leaves and K % in leaves were significantly increased by the application of 25 % chicken manure + 75 % NPK treatment as compared with other treatments in both seasons of study. On the other hand, K % in tubers was significantly affected by these treatments in both seasons of study. Nitrate (NO3) and nitrite (NO2) content in tubers were significantly affected with the application of 100 % NPK (control treatment) as compared with other treatments in both seasons of study. RECOMMENDATION According to the obtained data results, supplying potato plants with 50 % mineral fertilizers (90 kg N + 36 kg P2O5 + 48 kg K2O/fed) with 50 % chicken manure increased all vegetative growth, yield and its components and tuber quality in both seasons of study at Belqas region, Dakahlia Governorate conditions.