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ABSTRACT 
The topic of “Producing foliar fertilizer from catfish by-products (Pangasius 
hypophthalmus) and pineapple peel” has been carried out from February to August 
2017. This study focuses on: 
- Determining total nitrogen in Kjeldahl and total protein from catfish by-
products. 
- Evaluating the bromelain activity of composions of pineapple fruit. 
- Evaluating the effect of the ration between pineapple peel and catfish by-
products on total nitrogen and formol nitrogen of fertilizer production. 
- Determining the volume of water that was supplied to convert catfish by-
products to fertilizer. 
- Evaluating the effect of pH on enzyme activity.
- Determining the optimum time to hydrolyze catfish by-products by using 
pineapple peel. 
- Determinating the efficiency of foliar fertilizer from catfish by-products 
on the crops. 
The study result showed that the catfish by-products had a highly total
nitrogen (2.34%) that was a valuable resource to produce fertilizer. Besides, weight 
percent composition of a Cayena pineapple was: Pulp (30,02%), core (6,14%), peel 
(48.53%) and crown (15,31%). The waste of Pineapple represents about 70% of 
pineapple weight and peels had the high weight and high enzyme activity. Using the 
bromelain from pineapple peeles to hydrolyze catfish by - products has been carried 
out. The optimum pH for the enzyme activity was 6 and the suitable time for the 
hydrolyzation was 12 days and optimal ratio of pineapple peel and catfish by-
products was 0.75: 1. The optimal ratio between water and substrate was 1: 1. The 
field experiment showed that this foliar fertilizer has efficiency on crop 
development as high as commercial fertilizer. 

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