engleski

Impact of nitrogen fertilization and in-row seed distance on potato yield, tuber size and N recovery

Plant densities play an important role on plant N uptake and affecting yield quality and quantity. The main objective was to study effect of the different nitrogen levels and plant densities on N recovery and yield quality and quantity. A split-plot trial with six N levels (0, 50, 100, 150, 200 and 250 kg N ha-1) as main factor and three in-row seed distances (25, 30 and 35 cm) was conducted on private farm near Gospić, Croatia during two growing seasons in 2009 and 2010. The total fresh tuber yield increased significantly by N application in both years and by reducing in-row seed distance in 2009, but difference between N levels was insignificant. Highest fresh tuber yield with significantly fewer portions of small sized tubers was obtained by application 150 kg N ha-1 in 2009 growth season. Significantly highest tuber yield was obtained by application 150 kg N ha-1 in combination with 35 cm in-row seed distance in 2010 growth season only. By increasing in-row seed space from 25 to 35 total fresh tuber yields increased mostly by significant decreasing portion of small sized tubers and by increasing portion of medium or large sized tubers. Nitrogen recovery increased by plant density and decreased by increasing N application levels.

yield quality and quantity; nitrogen uptake; plant density

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