Abstract
This study aims to determine the most suitable dose of the mixture of organic fertilizers and probioticsincluding Ong Bien fertilizer, manure and composts from fish and soybean via foliar spray and irrigation for 4-year-old Taiwan guava grown at Cumgar district, Daklak Province in 2019. The results showed thatthe application of 30 kg manure + 9 kg organic fertilizer (Ong Bien) with foliar spray of 8 liter fish emulsion + 8 liter soybean emulsion (for plant-1) led to an increase in flowering and fruiting rate, fruit weight and fruit quality. By this combined application, the acutal fruit yield, Brix and economic efficency of the guava reached29.60 tons ha-1 (39.62% higher in comparision with control), 10.15% (10.57% higher in comparision with control) and 463.95 milion VND ha-1 per year (30.17% higher in comparision with control), respectively.
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