Components of Phalaris aquatica L. seed yield and quality

The relationships between seed yield of Phalaris aquatica and seed yield components (number of panicles/m, length of panicles and 1000 seeds weight) were investigated. The seeds were obtained from an experiment where two distances between rows (30 and 60 cm) and three levels of N (0, 100 y 200 KgN/ha) were compared, during two years. The effect of these treatments on seed germination percentages, was also analysed. The number of panicles/m increased significantly (P less than or equal to 0,01) each year-with increments in-row distances and N levels. The length of panieles increased significantly (P less than or equal to 0.01) only with increments in N levels. The 1000 seeds weight was not affected. In the linear regression the number of panicles/m explains 96% and 91% of the yield variation in 1993 and 1994 respectively. These percentages were not improved when multiple regression analysis with any combination of the three seed yield components was performed. The statical anaylsis of the germination percentages showed no effect.