Consequently, data will not be ava i I able on rate and time of ferti I izer 

 application until the end of the 1966 season. 



c. Source of Nitrogen 



Three experiments involving nitrogen sources were initiated in the 

 spring of 1964. Two of these were on plantings of American beachgrass on a 

 foredune and saltmeadow cordgrass on the Ocracoke flats that had been made 

 4 or 5 years earl ier. The thi rd, American beachgrass on hydra u lie fill, 

 utilized a stand planted in March 1964. Treatments began in April 1964 and 

 growth measurements were made in August 1965. These data, shown in Table 

 6, indicate that all of the standard soluble sources, applied in the normal 

 manner, were equally satisfactory over the fairly wide range of conditions 

 represented by these trials. The Urea-Formaldehyde form, applied on the 

 surface, was substantially less effective than the readily soluble forms. 

 Due to the low moisture holding capacity and very low microbial activity 

 of these sands, it will probably be necessary to incorporate the less 

 soluble forms with the sand in order to make it a fair test. Such a test 

 is to be tried in 1 966. 



TABLE 6 



Source of Nitrogen on Dune Grasses - Initiated Spring 1964 



Yield (1965) lb/acre dry weight 

 Beachgrass Cordgrass 



Source Foredune* Hydrau lie fill** Ocracoke flat* 



1. Check 



2. Ammonium Nitrate 



3. Ammonium Sulfate 



4. Urea 



5. Sodium Nitrate 



6. Urea-Formaldehyde 



7. 30-10-0 



Least Significant Difference 

 Least Significant Difference 

 Coefficient Variability 



,05 

 ,01 



983 

 5935 

 5349 

 5145 

 5670 

 3258 

 5681 

 1365 

 1858 



391 

 4428 



4673 

 4618 

 2365 

 5058 

 1046 

 1641 

 25$ 



294 

 5492 

 6380 

 5492 

 5889 

 2197 

 6122 

 1379 

 1875 



*4 replications; **2 replications 



All plots received annually 50 pounds Nitrogen, April, June, August, plus 



50 pounds P 2 5 and K 2 in April, except 30-10-0 plots 



14 



