De invloed van den kalktoestand van juvenielen Merapi-aschgrond op eenige kwaliteitseigenschappen van Vorstenlandsche tabak
1932
Middelburg, H.A.
The influence of lime status of volcanic-ash soil was examined by pot trials in conditions as similar as possible to those of the plantation. Soils used were fine juvenile Merapi ash, the most important soil for tobacco growing, and, as a contrast, weathered laterite. In laterite artificial graduations in lime status were achieved by mixing with increasing quantities of hydrated lime or S. The lime saturation and the base saturation were examined on clay < 5 m u* or < 20 mu* The laterite proved to be less saturated with Ca than the ash clay. Na formed a much larger proportion of bases in the laterite soil. Fe and Al were liberated in acid soil from which lime was removed, resulting sometimes in poisoning symptoms (leaf- spots.).Leaching of Cl was directly promoted by liming, resulting in decrease of leafC1 and improving so its fire-holding capacity. The colour of the fermented leaves became more drab and more even, but also darker by a high lime status. Seedling development in unfertilized ash soil was also improved by liming (turning dark green), and injured by addition of S (turning yellowish green).Aftereffects of lime status on the seed-beds could be observed after planting in the field and dressing with (NHAS04. The young plants from highly saturated soils showed a better development and leaf quality.
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