Potassium Absorption,Accumulation and Distribution Characteristics of Potato in Winter
The potassium absorption,accumulation of potato in winter was carried out by field experiment with NPK basal fertilizer and top dressing proportion.The results showed: The potassium concentration in the leaves reached a peak about 65 days after full emengence and then decreased;In the stems,the potassium concentration reached the peak 15 and 45 days after full emengence;In the tubers,the concentration of potassium in the mass reached the maximum 35 days after full emengence,and then decreased.In cold and wet year,5.82 kg potassium(K),and 7.28 kg(K)in cool and dry year was needed to produce 1 000 kg of tubers.Potassium in the leaves reached the peak after full emengence 5 days,about 70% potassium was allocated to leaves and then decreased to about 10% in last stage.Potassium in the stem reached the peak after full emengence 15 days,about 30%,at last about 10% of the potassium still kept in leaves;In tubers,potassium distribution ratio increased gradually,about 80% potassium transferred into tubers in the end of development stage.