Response of agronomical, physiological, apparent recovery nitrogen use efficiency and yield of potato tuber (Solanum tuberosum L.), to nitrogen and plant density.

Abstract

In order to investigation the response of agronomical, physiological, apparent recovery nitrogen use efficiency and yield of potato tuber (Agria cultivar), to nitrogen and plant density, a field experiment was carried out in Ardabil, Iran. The experiment was factorial in the base of randomized complete block design with three replications. Factors included nitrogen fertilizer level (0, 80, 160 and 200 kg ha as urea) and plant density 1 (5.5, 7.5 and 11 plant m ). Results showed that increasing nitrogen level up to 80 kg ha led to more tuber 21 yield. The highest yield, number of stolon, harvest index, number of tuber and dry weight of tuber were obtained with application of jointly 80 and160 kg ha nitrogen. Increasing plant density resulted in higher 1 tuber yield, number of stolon, dry weight of tuber and total dry matter yield and decreased harvest index. Increasing nitrogen fertilizer rate up to 160 kg ha increased mean tuber weight and total dry matter yield. 1 12