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Studies on the quality in processing potatoes as affected by cultivated condition 1. malformation



Studies on the quality in processing potatoes as affected by cultivated condition 1. malformation



Research Reports of the Rural Development Administration 33(2 HORTIC): 65-82



Influences of soil condition, nitrogen level and planting density on the occurrence of abnormal tubers of six promising varieties and clones were studied to obtain basic information for breeding potato varieties with good processing qualities and improvement of cultivation techniques for processing potatoes under the climatic conditions of Korea. The occurrence rate of abnormal tubers was higher in the order of gravelly loam soil > clay loam soil > loam soil with good drainage > loam soil with poor drainage > sandy loam soil, with highest rate in the gravelly loam soil. Soil moisture stress and physical conditions of soil appear to be important factors causing tuber malformation. Russet Burbank was the highest in abnormal-tuber occurrence with the rate of 34.2% in the gravelly loam soil, followed by Daekwan 48 and Irish Cobbler in order. The low rates of abnormal-tuber occurrence in the varieties of Superior, Jopung and Lemhi Russet suggested differences susceptibility to tuber malformation between potato varieties. Varieties with late maturity showed higher rates of abnormal-tuber occurrence than those with early maturity. Abnormal tubers were categorized into the off type with the secondary growth at the apical-bud portion, the knobby type with the secondary growth at the lateral-bud portion, the dimple tuber with sunken surface and cracking with cracked surface. The off type consisted of dolled and pointed tubers, and the knobby type consisted of knobbiness and rough tubers. The occurrence rates of dimple tubers were similar to those of sum of off and knobby types, suggesting that occurrence of dimple tubers could be a problem. However, Russet Burbank showed a very high rate (73%) of the off type but a quite low rate of dimple tubers, revealing its uniqueness in tuber malformation. The causal factor of off and knobby types and cracking appears to be low contents and sudden changes in soil moisture, and that of dimple tubers appears to be the physical pressure of soil. The yield of abnormal tubers was decreased in the plot of the decreased (10kg/10a) of nitrogen application as compared with the plots of the conventional level (15kg/10a) and increased level (25kg/10a) of nitrogen application.

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