1. Eight oz of ammonium sulfate + 13 oz of 0- 

 24-0 fertilizer + 3 oz of 0-0-61 fertilizer per 

 bush. 



2. Cod hydrolysate (3% N), 3.3 lb per bush. 



3. Herring hydrolysate (3% N), 3.3 lb per bush. 



4. Shrimp and cod (shrimp) hydrolysate (3% 

 N), 3.3 lb per bush. 



Hydrolysates were made up to contain twice 

 as much P as N, and equal amounts of K and N, 

 so all treatments were designed to apply 0.1 lb 

 of N, 0.2 lb of P, and 0.1 lb of K per bush. 



Treatments were applied on May 7, 1991. 

 Each treatment was replicated 7 times, with 

 each replicate being a separate cultivar: 

 Earliblue, Collins, Blueray, Bluecrop, Herbert, 

 Coville, and Jersey. Leaves were sampled for 

 mineral analyses in July. 



Experiment 4 was established in a private 

 highbush blueberry planting in Montague, MA. 

 Only Bluecrop bushes planted in 1983 were 

 used. Four treatments were applied, each repli- 

 cated 10 times. 



1. Ammonium sulfate, 105 g per bush. 



2. 5-10-10 fertilizer, 450 g per bush. 



3. Cod hydrolysate (3% N), 750 g per bush. 



4. Herring hydrolysate (2.5% N), 900 g per 

 bush. 



Hydrolysates were made up to contain twice 

 as much P as N, and the same amount of K as N. 

 Treatments all were designed to provide 0.8 



ounce of N per bush; however, different treat- 

 ments provided different amounts of P and K, 

 and the hydrolysates also provided varying 

 amounts of other elements. Leaves were taken 

 in July for mineral analyses. 



Concentrations of N, P, and K in blueberry 

 leaves are shown in Table 4. Magnesium, cal- 

 cium, boron, and manganese also were mea- 

 sured but are not shown in Table 4. There were 

 no differences among the treatments at the 

 HRC, where all treatments received equal 

 amounts of N, P, and K. In Montague, bushes 

 receiving only N (ammonium sulfate) had lower 

 P and K concentrations than ones receiving N, P, 

 and K. Bushes receiving 5-10-10 had slightly 

 higher boron concentrations than the others, 

 but since boron was not applied to these plants, 

 this result is apparently spurious. 



There were no differences in mineral concen- 

 trations in bushes fertilized with fish hydroly- 

 sates vs. ones fertilized with inorganic N. Like- 

 wise, there was no evident difference in growth 

 or appearance of bushes among the treatments. 



Discussion 



These results indicate that fish waste hydro- 

 lysates are suitable for use as fertilizer in apple 

 orchards and highbush blueberry plantings. 

 Equivalent applications of inorganic N fertiliz- 

 ers and various sources of fish hydrolysates all 

 produced equivalent results. In areas where 

 these hydrolysates are available, they appear to 

 be equivalent alternatives to conventional inor- 

 ganic fertilizer sources. These materials could 



Fruit Notes, Summer, 1992 



