Effect of different levels and sources of nitrogen on growth, yield and quality of potatoes grown under sandy soil conditions
2005
Bakhit, Raafat S. | Hasan, Hasan A. | Ramadhan, Husain M. | El-Anani, Ahmad M.
Two field experiments were carried out during the two successive summer seasons of 1999 and 2000 to investigate the effect of nitrogen fertilization levels i.e., 120, 150 or 180 kg N/fed. either in a mineral form or half of the tested level as organic form (chicken manure) and the other half in the mineral form on vegetative growth, tuber yield and its components as well as chemical composition for plant foliage and tubers for cv. Spunta grown under sandy soil conditions. The experiment was set out in compete randomized block design with four replicates in both seasons. The obtained results indicated that increasing nitrogen level from 120 up to 180 kg N/fed. In the form of ammonium nitrate only or half of used level as a mineral form and the other used half as organic manure (chicken manure) increased all the studied growth aspects, i.e., plant height, number of leaves and stems per plant, fresh and dry weight of plant f oliage during the two seasons of study. Chemical constituents of plant foliage and produced tubers (N, P and K, crud protein reducing and total sugars as well as starch content of tubers) were increased with increasing nitrogen levels up to the highest used one (180 kg N/fed.). Total tubers yield fed. As well as physical quality of produced tubers were higher in case of the highest used level either as a mineral form or half of used level as a mineral and the other half as organic form (chicken manure). Using the highest level of nitrogen fertilizer (180 kg N/fed.) reflected the highest yield of medium and large size tubers compared with other used levels.
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