RESEARCH ON THE EFFECT OF SOME BIOLOGICAL PRODUCTS IN ORGANIC TEA PRODUCTION AT PHU THO PROVINCE

Abstract

Results of research on the effect of some biological products in organic tea production at Phu Tho province showed that: The treatments with different biological products affected the yield and quality of raw materials. The treatment for spraying Bio soil biological products helps improve soil quality, increase porosity, total humus content, total microorganisms and cellulose-decomposing microorganisms in the soil, the data are respectively 67.24%; 2.10%; 2.87 x 10⁶ CFU/g soil and 3.54 x 10⁴ CFU/g soil, increase the highest yield of 6.88 tons/ha and was less susceptible to pests. Leaf young ration between the treatments of biological products for VN15 tea variety tend to decrease gradually from treatment 1 to treatment 3. When spraying Bio soil biological products for tea plantation, the tanin content was lowest, while the content of soluble substances, reducing sugars, aromatic compounds, all had higher values than other treatment. The quality of green tea at treatment 3 (when spraying Bio soil biological products) was the best with sensory test score of 17.77 points by taste sensory testing compared to that of treatment 1 (no spray), treatment 2 (Rebio Reno spray) and treatment 4 (EM1 Sumo spray).