boron, manganese, copper, and zinc concentra- 

 tions, and there were no differences among 

 treatments except for a slightly higher zinc level 

 in leaves fertilized with cod hydrolysate than 

 with herring hydrolysate or ammonium nitrate. 

 Tree growth measurements are shown in 

 Table 2. Neither increase in trunk circumfer- 

 ence nor amount of terminal growth was influ- 

 enced in either year by fertilizer source. Also 

 shown in Table 2 are total numbers of fruit 

 harvested from each tree, and the incidences of 

 disorders in the fruit after storage in 1991. 

 There was no effect of fertilizer source on either 

 total fruit per tree or development of disorders 

 after storage. 



Experiment 2 



A block of scab-resistant apple cultivars 

 planted in 1988 at the HRC was chosen. An 

 experiment was established applying 4 treat- 

 ments with 6 replications, 3 replications using 

 Liberty trees and 3 replications using Redfree 

 trees, both on M.26 rootstocks. 



Treatments were as follows: 



1. Ammonium nitrate, 0.9 lb per tree, plus 2.5 



lb of 0-24-0 fertilizer and 1 lb of 0-0-61 

 fertilizer. 



2. Cod hydrolysate (6% N), at 5.2 lb per tree. 



3. Herring hydrolysate (5% N), at 6.3 lb per 

 tree. 



4. Shrimp and cod (shrimp) hydrolysate (5% 

 N), at 6.3 lb per tree. 



Hydrolysates were made up to contain twice 

 as much P as N, and an equal amount of K as N, 

 and treatments were designed to apply equal 

 amounts of N, P, and K to all trees. Treatments 

 were applied on May 7 , 1 99 1 . Leaves were taken 

 in July, 1991 for mineral analyses. No growth 

 measurements were made, but both trees and 

 fruit were examined periodically. 



Leaf mineral analyses of N, P, and K are 

 presented in Table 3. Magnesium, calcium, 

 manganese, boron, zinc, and copper also were 

 analyzed but data are not presented. The only 

 differences recorded were in leaf K and manga- 

 nese. All hydrolysates were made up to contain 

 the same amount of K as was applied with the 

 ammonium nitrate, yet all hydrolysates pro- 

 duced lower K concentrations than did the inor- 

 ganic fertilizer treatment. The hydrolysates all 

 contained some manganese, which was not sup- 

 plied with the inorganic fertilizer treatment. 

 Yet, the hydrolysates all produced lower leaf 

 manganese concentrations. Since neither the K 

 nor the manganese difference is reconcilable 

 with treatment, and neither response occurred 

 in Experiment 1, it is likely that these differ- 

 ences are spurious and not reproducible. Also, 

 there was no evident difference in tree growth or 

 fruit quality among the trees in this experiment. 



Experiment 3 and 4 



Two experiments were established in high- 

 bush blueberry plantings in 1991. Experiment 

 3 was established in a mature planting at the 

 HRC. Four treatments were applied: 



Fruit Notes, Summer, 1992 



17 



