INFLUENCE OF NITROGEN ON GROWTH YIELD AND QUALITY OF SOME POTATO VARIETIES

Abstract

A field experiment was conducted at the research field of Sher-e-Bangla Agricultural University, Dhaka, during the period from October 2013 to March 2014, to investigate the Influence of Nitrogen on growth, yield and quality of some potato varieties. The experiment comprised as two factors, Factor A: Nitrogen levels (4); N -control (No nitrogen), N 1 -100 kg N ha varieties (4); V 1 -1 , N -Diamont, V 2 -150 kg N ha 2 -Asterix, V -1 , N 3 3 -200 kg N ha -Lady rosetta, V -1 0 and Factor B: Potato -BARI TPS-1.The experiment was laid in a split-plot design with three replications. The result revealed that nitrogen and potato varieties had significant effects on most of the growth, yield and quality parameter studied in this experiment. The growth parameter such as the highest plant length, maximum number of leaves plant -1 4 , maximum of stems hill , maximum dry matter were recorded from the application of 200 kg N ha .Results showed that, tuber yield, flesh dry matter content, specific gravity, total soluble solids and starch content gradually increased with increasing up to 150 kg N ha and there after decreased with increasing N level. The highest plant length (81.05cm) and maximum number of leaves plant -1 (53.05) were recorded from BARI TPS-1.The different potato varieties, Diamont exhibited better performance in respect of yield. Diamont produced maximum tuber yield (28.45 t ha -1 ) with the application of 150 kg N ha -1 . Among the sixteen treatment combinations, the 150 kg N ha rosetta produced maximum specific gravity (1.12 g cm -3 -1 -1 -1 along with Lady ), highest flesh dry matter (24.52%), maximum starch (18.05%) and optimum total soluble solids (6.00%). This combination also demonstrated better performance for producing quality potato tuber. The information obtained in this study will inform Bangladeshi potato farmers and processors regarding the suitable N level for the production of processing potato tuber. -1