干拓地에서 사탕무우의 糖蓄積과 無機養分 吸收에 關하여 = On the Sugar Accumulation and Absorption of Mineral Nutrients of the Suger Beet in Reclaimed Salty Area

다국어 초록 (Multilingual Abstract)

In order to investigate the sugar accumulation and absorption of mineral nutrients of sugar beet in reclaimed area, a sample variety Kawemegapoly was used in experimental plots of various salt concentration arranged in Mimyeon reclaimed area located at Okgu-gun, Cholla Bukdo Province. The results obtained are summarized as follows:
The soil texture of Mimyeon reclaimed area is formed with silty loam which represents an ideal soil condition for the culture of sugar beet in reclaimed area. Although the rainy season of 1976 began belatedly from the latter part of August, the culture of sugar beet showed excellent growth. The salt concentration of cultivating layer of field began to decline from the middle of June and rise again in the middle of October as generally seen in reclaimed area of Korea.
The yield of sugar beet in terms of the weight of root was 5.0∼5.5M/T in the plot containing less than 0.5% salt while the plot ot 0.52% showed 4.4M/T and high salty plot of 1.82% salt also showed a large yield amounting to 3.7M/T. Sugar contained in the root observed in terms of Brix degree was 19.6∼19.9% in low salty plot while sugar accumulation in high salty plot was relatively high amounting up to 24.8%.
The result of sugar accumulation in each plot of various salt concentration observed in terms of Brix degree revealed that sugar accumulation declined once in the latter part of August or in early September and began to proceed again from the middle of September. Such temporary retrocession of sugar accumulation was considered to be related to high temperature prevailed at that time.
In the experiment of sand culture of sugar beet, its growth was more vigorous in the plot containing salt up to 0.5% than in the control plot. The plot containing salt up to 2.0% showed almost similar growth to the control plot. This suggests that the sugar beet is of strong salt tolerance. Inorganic nutritive analysis of sugar beet was made with sample variety obtained from sand culture. The result revealed that N,P, and Mn were absorbed more than the control plot while the absorption of K, Ca, and SiO₂was inhibited. Mg, Zn, and Fe were not affected by the conditions of salt concentration.