STUDY ON DETERMINING THE FORMULA OF REASONABLE FERTILIZER FOR BLACK PEPPER (Piper nigrum L.) IN PHU QUOC SPECIAL ZONE, AN GIANG PROVINCE

Abstract

Studying on determining the formula of reasonable fertilizer for black pepper was conducted over two years 2022 - 2023 and 2023 - 2024 to identify the appropriate fertilizer formula for black pepper plants in the fruited stage in Phu Quoc city, Kien Giang province (now as Phu Quoc special zone, An Giang province) so that the black pepper garden grows stably and has reasonable production costs. The experiment was laid out in a randomized complete block design (RCBD) with 5 inorganic and organic fertilizer formulas and 3 replications. Of which, the treatment of CT5 is a control formula commonly applied by farmers in Phu Quoc special zone, An Giang province. Each treatment was arranged on 16 poles of black pepper and all parameters of the experiment were observed at 4 poles in the center of treatment. The experimental black pepper garden was growing black pepper variety of Phu Quoc, concrete poles, and with the age of 8 years. The results of applying organic fertilizer with dosage (composted cow manure: 10 kg/poles, supplemented with microbial organic fertilizer 1 kg/pole) combined with inorganic fertilizer with the formula (250 N - 80 P₂O₅ - 300 K₂O) kg/ha showed that black pepper plants grew quite stably during 2 years; the yield was quite high, the average yield of 2.9 - 3.1 tons per ha and 11% higher than the control; the desease incidence of black pepper was quiet low; the bulk density of peppercorns was quite good, over 570 g/L and the production cost was lowest, the profit was highest under experimental conditions.