Table 19. Third-year effect of nitrogen and phosphorus fertilizers^ 

 on the tall form of Spartina alterniflora at Oak Island 

 (30 Sept 1974]. Plots 4 by 25 feet, three replications. 



N rate 

 (kg/ha) 



P rate 

 (kg/ha) 





Aerial dry weight 

 (kg/ha) 



Flowers/m^ 



No. culms/m'^ 









74 







74 







74 





 168 

 336 

 672 



18,667 

 25,587 

 15,947 

 21,107 



23,680 

 23,427 

 27,720 

 26,133 



28 

 39 



20 



27 



39 

 36 

 44 

 36 



251 

 323 

 197 

 233 



243 

 281 

 277 

 263 



LSD:^ N 0.01 



0.05 



P 0.01 



0.05 



N X P 0.01 



0.05 



cv'* c%) 





*3 



*3 

 4,002 

 2,884 



5,767 

 14.5 





*3 

 *3 



6 



4 



12 



9 



14.5 





*3 

 *3 

 *3 

 *3 

 *3 

 *3 



22.5 





Height (cm) 



Basal area 

 (cm2/m2) 



Salinity (ppt) 









74 







74 







74 





 168 

 336 

 672 



158 

 178 

 165 

 176 



180 

 176 

 187 



177 



226 

 328 

 208 

 328 



274 

 324 

 324 

 299 



22 

 21 

 21 

 21 



21 

 23 

 22 

 22 



LSD:2 N 0.01 



0.05 



P 0.01 



0.05 



N X P 0.01 



0.05 



cv" (%) 





*3 

 *3 

 *3 

 *3 

 ^3 

 ^3 



7.5 





*3 

 *3 

 *3 

 *3 

 *3 

 ^3 



18.0 





*3 

 *3 

 *3 

 ^3 

 ^3 

 *3 

 7.7 



1. Fertilizer applied 13 May, 19 June, and 19 August 1974. 



2. Least significant difference. 



3. Not significant. 



4. Coefficient of variation. 



67 



