STUDY THE EFFECT OF PARTIAL SUBSTITUTION OF CHEMICAL FERTILIZER WITH SOME TYPES OF ORGANIC FERTILIZER ON TUBER YIELD AND QUALITY OF POTATO

Abstract

This experiment was conducted to determine the suitable partial substitution of chemical fertilizer with organic fertilizer on tuber yield and quality of potato. The field experiment was carried out in a randomized complete block design with three replications with seven treatments as: 100% chemical fertilizer, 75% chemical fertilizer + 25% microbial organic fertilize replacing chemical fertilizer; 50% chemical fertilizer + 50% microbial organic fertilize replacing chemical fertilizer; 25% chemical fertilizer + 75% microbial organic fertilize replacing CF; 75% CF + 25% chicken manure replacing chemical fertilizer; 50% chemical fertilizer + 50% chicken manure replacing chemical fertilizer and 25% chemical fertilizer + 75% chicken manure replacing chemical fertilizer. The results showed that compared to chemical fertilizer application alone, partial substitution of chemical fertilizer with organic fertilizer improved growth, physical traits and consequentlly increased the tuber yield and nutrient quality of potato. The application of 50% substitution of chemical fertilizer with organic fertilizer (microbial organic fertilize or chicken manure) could be optimal in improving the tuber yield and nutrient quality of  potato.