Potato nutritional status at the onset of tuberisation - a yield prediction tool

Potato nutritional status at the onset of tuberisation - a yield prediction tool

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A reliable tuber yield prognosis requires a complex statistical analysis of potato nutritional status in the fully developed 4th leaf at the onset of tuberisation.This hypothesis was validated in the series of field experiments conducted in 2006-2008 in Poland.The experimental design was composed of two nitrogen (N) rates (60, 120 kg/ha), two N fertilisers (Urea and Agrotain), two rates of sulfur (0, 50 kg/ha).

The marketable tuber yield of cv.Zeus ranged from 31.3 turbo air m3f24-1-n to 59.

3 t/ha in 2008 and 2006, respectively.Despite annual variability, the potato presented a good nutritional status.In 2008, the contents of N, Mg, Cu and Zn were about 33% lower as compared to 2006.

The stepwise and path analyses indicated N, Mg and Cu as the key yield-limiting nutrients.The diagnosis and recommendation integrated system (DRIS) showed click here that a slight imbalance of N and Mg did not disturb tuber yield, provided a positive balance of K was maintained.The Mg index, as a result of the DRIS procedure, emerged as the best single predictor of potato yield.