| Abstract Detail
Physiology Karlsson, Bjorn H. [1], Palta, Jiwan P. [2]. Influence of in-season supplemental calcium application on tuber internal defects: A five-year study showing cultivar and seasonal variation. OUR previous research suggests that in-season calcium applications can increase tuber calcium and quality. However, response to calcium is variable across seasons and cultivars. Data was obtained from five seasons (1998-2003) for five (Solanum tuberosum L.) cultivars (‘Russet Burbank’, ‘Atlantic’, ‘Snowden’, ‘Superior’ and ‘Dark Red Norland’) for hollow heart, brown center and internal brown spot. Supplemental calcium consisted of calcium chloride, calcium nitrate and urea (CUC) and applied in three split applications totaling 168 kg.ha-1 calcium. Control split ammonium nitrate timing and amounts resulted in same total nitrogen and timing for all plots. Five replications per treatment per year were cut and examined for the incidence of internal defects. Paired samples of medullary tissue were taken for calcium concentration from 3 separate ten-tuber composite samples per replication resulting in over 500 tubers analyzed for each treatment every season for internal defects. Calcium was significantly increased in all cultivars in all years with the exception of 2003 for ‘Atlantic’, the year with highest overall calcium levels. ‘Superior’ and ‘Dark Red Norland’ had the highest calcium values, ‘Russet Burbank’ intermediate and lowest in ‘Snowden’ and ‘Atlantic’. All internal defects were significantly reduced in ‘Atlantic’ across five years and hollow heart was significantly reduced in ‘Snowden’ though the incidence in this cultivar was low (< 1 %). Trends were noted for reduction in internal brown spot and hollow heart for ‘Russet Burbank’, ‘Dark Red Norland’and ‘Superior’. Pooled meta-analyses for five years showed that incidence of internal defects was significantly reduced with Ca application in ‘Atlantic’, ‘Burbank’ and ‘Snowden’. ‘Dark Red Norland’ and ‘Superior’ generally had very low incidence of defects and consistently had higher tissue Ca concentration over seasons. Our results show that in-season calcium application can increase tuber calcium and reduce internal defects.
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1 - University of Wisconsin-Madison, Horticulture, 1575 Linden Dr., Rm 431 Plant Sciences, Madison, WI, 53706, USA
2 - University of Wisconsin, Department of Horticulture, 1575 Linden Drive, Madison, WI, 53706, USA
Keywords:
hollow heart
internal brown spot
internal heat necrosis
brown center
Calcium
Russet Burbank
Atlantic
Snowden
Dark Red Norland
Superior
Quality
processing quality
Yield and quality.
Session: PAA05-2
Location: Hall of Ideas Room F/Monona Terrace
Date: Thursday, July 27th, 2006
Time: 8:45 AM
Abstract ID:408 |
