Effect of Various Nitrogen Sources on Yield and Some Properties of Potato Plant

Authors: Sait GEZGİN, Şerife UYANÖZ

Abstract: In this investigation, the effects of some slow release and conventionally used fast release nitrogen sources in the soils of Nigde-Misli plain on tuber yield, and protein, starch and NO 3 contents of tubers of the potato plants grown under greenhouse condi-tions were determined. Effect of nitrogen levels on tuber yield, as mean of nitrogen sources were found as follows: N 2 >N 1 >N 4 >N 3 >N 0 . On the other hand, increasing levels of nitrogen applied to the soil increased the protein and starch contents of the potato tubers. The highest and low-est tuber yield as mean of N levels was obtained with AS+AZN and AS+PG respectively. According to efficiency of nitrogen sources on tuber yield, nitrogen sources were grouped as; first group AS+AZN, AS+SCU, AZN, FLD; second group FLD, SCU; third group SCU, AS+FLD, AS+N-serve and last group AS, AS+PG. Differences between the groups were is statistically significant (p<0.05). AS+PG (AS+Phosphogypsum), AS (Ammonium sulfate) and AS+N-serve applications caused the highest increase in the starch con-tent but the lowest increases in the tuber yield and protein contents of the tubers. Effects of various nitrogen sources and levels varied on the NO 3 content of the tuber; the highest NO 3 content was determined with the AS, where as the lowest NO 3 contents with the AS+N-serve, SCU (Sulphur coated urea), FLD (Floranid) and the AS+PG and AZN (Azolon) sources.

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