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20. Abstract (Continued) 



more plant cover was produced from seeding at the rate of 100 viable seeds per 

 square meter than from transplanting single-stem plants on a 0.9-meter spacing. 



The relationship of mineral nutrition to productivity of S. alterniflora 

 was determined. Plants and soils in natural stands were sampled and analyzed 

 for productivity interrelationships using multiple regression techniques. 

 Salinity of the soil solution, plant and soil manganese concentrations, and 

 plant sulfur concentrations were negatively associated with aboveground produc- 

 tion. Variables positively associated with production included phosphorus 

 concentration in the plant tissue and in the soil. Fertilizer experiments 

 showed that the production of a natural stand of S. altevniflova growing on 

 sand was increased significantly by additions of nitrogen and increased three- 

 fold when both nitrogen and phosphorus were added. The production of natural 

 marsh growing on finer-textured sediments doubled when nitrogen was added, 

 but there was no response to phosphorus. Nitrogen and phosphorus fertilizers 

 also enhanced growth of transplants and seedlings on sandy dredge material. 





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