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1. By the way of pot-trials investigations were made into the possibility of detecting during the vegetation period a diminution of grain and straw yields from oats, cxpected to result from sulphur deficiency, and avoiding it by the application of sulphur containing fertilizers at the time of shooting resp. during the formation of panicles. Furthermore, a determination of the sulphur content of grain and straw was made for the maximum oats yield. 2. With a S-content of the dry matter a t the beginning of the formation of panicles of 1.6-1.7n/nn, a SO,-S-content of 0.8%0 and a N : S ratio of 10.4, an improved administration of sulphur did not result in any increase of grain and straw yields.3. With one exception (grain yields 1967, fertilization at the time of panicle formation), the application of sulphur a t the beginning of shooting or panicle formation produced the same effects on grain, straw and total yields of oats as a fertilization before sowing. 4.With a sulphur content of 2.0 %o and a N:S ratio of 10 in the grain, the oats plants proved to be sufficiently provided with sulphur. An examination of the straw did not show any evident correlation between the effects of fertilization on yields and the sulphur content or the N:S ratio.[3397]Geschichte, Ergebnisse und Bedeutung der Spurenelement-Forschung in Schleswig-Holstein ') V o n A . Finck") Institut fur Pflanzenernahrung und Bodenkunde der Universitat Kiel (Eingegangen: 9. 5. 1970) E i n l e i t u n g Schleswig-Holstein bot in den ersten Jahrzehnten dieses Jahrhunderts sowohl von seinen Boden als auch von seiner Landwirtschaft her alle Voraussetzungen, zum klassischen Land der Spurenelement-Forschung zu werden. Um die Jahrhundertwende nutzten viele Landwirte die Diingung n i t Kalkinergel, Phosphat, Kali, Sticlistoff in Verbindung n i t Meliorationsmaflnahinen zur Kultivierung bzw. intensiveren Nutzung bisheriger Udlandflkhen auf der ,Geest', dein mittleren Teil des Landes mit nur geringer Bodenfrucht-Larkeit. Dabei traten iiberraschenderweise z. T. auf frisch kultivierten (durch 1) Herrn Prof, Dr. W. Laatsch zum 65. Geburtstag gewidmet. -) Prof. Dr. Arnold Ftnck, Institut fiir Pflanzenernahrung und Bodenkunde, 23 Kiel, Olshausecstraae 40-60.
1. By the way of pot-trials investigations were made into the possibility of detecting during the vegetation period a diminution of grain and straw yields from oats, cxpected to result from sulphur deficiency, and avoiding it by the application of sulphur containing fertilizers at the time of shooting resp. during the formation of panicles. Furthermore, a determination of the sulphur content of grain and straw was made for the maximum oats yield. 2. With a S-content of the dry matter a t the beginning of the formation of panicles of 1.6-1.7n/nn, a SO,-S-content of 0.8%0 and a N : S ratio of 10.4, an improved administration of sulphur did not result in any increase of grain and straw yields.3. With one exception (grain yields 1967, fertilization at the time of panicle formation), the application of sulphur a t the beginning of shooting or panicle formation produced the same effects on grain, straw and total yields of oats as a fertilization before sowing. 4.With a sulphur content of 2.0 %o and a N:S ratio of 10 in the grain, the oats plants proved to be sufficiently provided with sulphur. An examination of the straw did not show any evident correlation between the effects of fertilization on yields and the sulphur content or the N:S ratio.[3397]Geschichte, Ergebnisse und Bedeutung der Spurenelement-Forschung in Schleswig-Holstein ') V o n A . Finck") Institut fur Pflanzenernahrung und Bodenkunde der Universitat Kiel (Eingegangen: 9. 5. 1970) E i n l e i t u n g Schleswig-Holstein bot in den ersten Jahrzehnten dieses Jahrhunderts sowohl von seinen Boden als auch von seiner Landwirtschaft her alle Voraussetzungen, zum klassischen Land der Spurenelement-Forschung zu werden. Um die Jahrhundertwende nutzten viele Landwirte die Diingung n i t Kalkinergel, Phosphat, Kali, Sticlistoff in Verbindung n i t Meliorationsmaflnahinen zur Kultivierung bzw. intensiveren Nutzung bisheriger Udlandflkhen auf der ,Geest', dein mittleren Teil des Landes mit nur geringer Bodenfrucht-Larkeit. Dabei traten iiberraschenderweise z. T. auf frisch kultivierten (durch 1) Herrn Prof, Dr. W. Laatsch zum 65. Geburtstag gewidmet. -) Prof. Dr. Arnold Ftnck, Institut fiir Pflanzenernahrung und Bodenkunde, 23 Kiel, Olshausecstraae 40-60.
Relationship between Mn in Oat Plants and Soils The Mn concentration of oat plants in the stage of appearing panicles from agricultural fields were put in relationship to extractable Mn. With soils of sandy texture (clay < 4%, pH 4,7–6,6) a correlation existed between Mn in plants and n‐MgCl2 extractable Mn, however, no additional relationship with the easyly reducible Mn. A negative correlation between pH and Mn in plants was traced to the pH dependence of exchangeable Mn. With soils of loess (clay 5–28%, pH 6,6–7,7) a significant correlation existed between Mn in plants and easyly reducible Mn fractions (methods by Schachtschabel: extracting solutions containing Na2SO3, pH 8,0, or Na2SO3 + NaHSO3, pH 5,5), however, only if an interrelationship with the pH of the soil was allowed for. The higher the pH of the soil the lower its level of extractable Mn might be, to reach a certain concentration of Mn in plants. This relationship seems to be caused through a modifying influence of the soil pH on the reducing power of the extracting solutions.
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