Effect of various rates of nitrogen fertilization on some quantitative, and qualitative characteristics of three introduced potato cultivars (Solanum tuberosum.L)

By: Mabrouk ELforgany , ElSaddek Algerawe

Department of Horticulture - Faculty of Agriculture - University of Tripoli

Issue: Vol 20 |First Issue | 2014

article language: Arabic

Abstract:

This experiment was conducted at the Agricultural Research Center - Tripoli Branch, during the spring season, to study the effect of fertilization with different rates of nitrogen on the quantitative and qualitative characteristics of three imported potato cultivars: Ajax, Concorde, and Liseta. The results showed the superiority of the Ajax and Liseta cultivars over the Concorde cultivar in total yield, as the total yield of the Ajax cultivar reached 29.48 tons/ha, while the total marketable yield of the Concorde cultivar was 22.23 tons/ha. The Ajax cultivar statistically outperformed the Concorde and Liseta cultivars in dry matter percentage, reducing sugars, starch, tuber specific gravity, and the Liseta cultivar in average tuber weight for total marketable yield. The Concorde cultivar significantly outperformed the Liseta cultivar in total soluble solids percentage, and both Concorde and Liseta in tuber protein percentage. The results indicate that nitrogen fertilization at rates ranging from (50 to 350 kg nitrogen/ha) led to a significant increase in total marketable yield, where the total yield for the rate of 150 kg nitrogen per hectare was (29.89 tons/ha) and the marketable yield was 28.22 tons/ha, as well as in the average tuber weight for total yield, the number of aerial stems per plant, and the protein percentage in tubers. Meanwhile, the percentages of dry matter, total soluble solids, specific gravity of tubers, starch, and reducing sugars were not significantly affected by the different nitrogen rates.