Effects of Potassium Application Rate on Yield, Quality and Potassium Efficiency of Winter Potato

doi:10.11924/j.issn.1000-6850.2013-3368

Abstract

Abstract: A field experiment was carried out to investigate the effects of potassium application rate (K₂O 0, 150, 225, 300, 375, 450 kg/hm²) on growth, yield, potassium use efficiency and quality of winter potato in Pearl River Delta area. The results showed that chlorophyll content, leaf area, and stem diameter of potassium treatment were better than those of control, the yield and economic effectiveness of K₂O 300 kg/hm² treatment was the highest. The content of crude protein and soluble sugar of potato tuber enhanced with potassium fertilizer application rate increased and significantly enhanced above K₂O 225 kg/hm² compare to control, while the same effect was observed on starch content and significantly enhanced above K₂O 300 kg/hm². However, the content of vitamin C was decreased when potassium applied. Agronomic K₂O use efficiency and physiological K₂O use efficiency were decreased with potassium application rate increased. Apparent K₂O recovery efficiency was improved then reduced with potassium application rate increased and peaked at K₂O 225 kg/hm². It is suggested that K₂O 225-300 kg/hm² application on winter potato in Pearl River Delta area was advisable.

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