Einfluß der Stickstoffdüngung auf Ertrag,Ertragsstruktur und N-Verwertung von Winterweizen - Möglichkeiten und Grenzen der Bestandesführung

Influence of nitrogen level on yield, yield structure and N utilization of winter wheat - Possibilities and limits of crop management In pot experiments the influence of number of plants per pot (10 or 20), nitrogen level (1,2 - 2,4 - 3,6 g N/pot) and application date (DC 21-29-32/37-51) on yield components, grain yield and nitrogen uptake was investigated. Number of stalks per plant were influenced by removing all tillers except one or two compared to untreated. In pots with 10 and 20 plants, yield was uneffected by the number of tillers removed. Similarly, small differences were observed in the number of earbearing stalks, grain per ear and weight of 1000 seeds. Yield components were not influenced by N-application at 2,4 g N/pot. Removal of tillers to one or two per plant resulted in high 1000 seed weight (58 g) and great number of seeds per ear (55) but not in high yields. The importance of a compensatory relation between the number of earbearing shoots, number of seeds per ear and 1000 seed weight for yield formation and N uptake is discussed.