ISHS Acta Horticulturae 684: Meeting of the Physiology Section of the European Association for Potato Research
RESPONSE OF POTATOES TO ORGANIC FERTILISER RATE: YIELD, TUBER QUALITY AND NUTRIENT UPTAKE |
| Authors: | G. Colla, M. Cardarelli, Y. Rouphael, A. Fiorillo, B. Cirica |
| Keywords: | Solanum tuberosum L., guano, organic fertiliser, nitrogen uptake, nitrogen use efficiency |
| Abstract:
Potatoes were grown during spring-summer 2003 and 2004 at the experimental farm of CCORAV located at Grotte di Castro, Viterbo, Central Italy to evaluate the impact of 5 rates of a guano-based organic fertiliser on yield, tuber quality, nitrogen uptake, and nitrogen use efficiency. A randomized complete block design with four replicates was used to compare 5 rates (0, 0.5, 10, 15, 20 t ha-1) of a guano-based fertiliser (10.0N-1.3P-2.5K). Rate of organic fertiliser did not affect yield of large size tubers (  > 75 mm) and small size tubers (< 45 mm). Increasing the fertiliser rate increased linearly the marketable yield of medium size tubers (> 45-75 mm) and total marketable yield.
There was a linear relationship between leaf N concentration at blooming stage and fertiliser rates, which suggested that the effect observed on marketable yield was probably due to N status.
Tuber nitrogen uptake increased by increasing fertiliser rate while the opposite was observed for nitrogen use efficiency.
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