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The importance of initial exchangeable ammonium in the nitrogen nutrition of lowland rice soils (1985)

Schön, H. G. ; Mengel, K. ; Datta, S. K.

Springer

Plant and soil 86 (1985), S. 403-413

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ISSN: 1573-5036

Keywords: Basal fertilizer application ; Method of N application ; Critical N level ; Efficiency of fertilizer use ; N transformation ; N fertilizer source

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Summary The importance of initial exchangeable soil NH 4 + in nitrogen nutrition and grain yield of rice was studied in a number of representative lowland rice soils in the Philippines. The initial exchangeable soil NH 4 + +fertilizer N plotted against nitrogen uptake by the crop resulted in a highly significant linear relationship (R2=0.91), suggesting that the presence of exchangeable NH 4 + in the soil at transplanting behaved like fertilizer nitrogen. The correlation between N fertilizer rate and N uptake by the rice crop was relatively poor (R2=0.73). On the other hand, relative grain yield was more closely correlated with the initial exchangeable soil NH 4 + +fertilizer N than with fertilizer nitrogen applied alone. These results indicate that the initial exchangeable NH 4 + in the soil contributed substantially to the nitrogen uptake of the crop. Critical nitrogen levels in the soil defined as the initial exchangeable soil NH 4 + +fertilizer N at which the optimum grain yield (95% of the maximum yield) is obtained, varied from 60 to 100 kg N/ha in the wet season and from 100 to 120 kg N/ha in the dry season for the different fertilizer treatments. The results further suggest that the initial exchangeable soil NH 4 + should serve as a guide in selecting an optimum nitrogen fertilizer rate for high grain yields.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02145461

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Komplexchemisches Verhalten von funktionellen Derivaten des 2-Äthyl-pyridins. I. Das 2-(β-Hydroxyäthyl)-pyridinProfessor Franz Hein zum 70. Geburtstage am 30. Juni 1962 gewidmet (1962)

Uhlig, E. ; Schön, H.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 316 (1962), S. 25-33

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ISSN: 0044-2313

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Description / Table of Contents: 2-(β-Hydroxyethyl)-pyridine reacts with Cu(II)-, Zn(II)-, Co(II)-, and Ni(II)ions forming 1,2-complexes. Zn(II) forms an 1,1-complex, too. No 1,3-complex has been isolated.The organic ligand is for the most part a bidentate one. CoCl2 and NiCl2, however, yield co-ordination compounds in which only the N-atom of the pyridine ring reacts as a donator.

Notes: Das 2-(β-Hydroxyäthyl)-pyridin bildet mit Kupfer(II)-, Zink(II)-, Kobalt(II)- und Nickel(II)-Ionen 1,2-Komplexe. Vom Zink(II) wird auch ein 1,1-Komplex beschrieben. In keinem Fall gelang die Isolierung von 1,3-Komplexen. Der Komplexbildner fungiert in den meisten Fällen als zweizähliger Ligand. Bei der Umsetzung mit Kobalt(II)- bzw. Nickel(II)-chlorid entstehen jedoch Komplexverbindungen, in denen nur der Pyridinstickstoff als Donator wirkt.

Additional Material: 1 Ill.