EFFECTS OF SOME ORGANIC FERTILIZER COMBINATIONS TO GREEN TEA GROWTH, YIELD FOLLOWING THE ORGANIC PRODUCTION

Agriculture

When transitioning from traditional cultivation to organic cultivation green tea yields and quality decrease significantly. There is a problem which green tea farmers is currently facing to. To minimize these disadvantages, this is needed to conduct researches to identify appropriate technical methods, practies and fertilization. In this study, we conducted research on four fertilizer combinations for green tea with the following quantities per hectare: 15 tons + 70 kg MgO, 25 tons + 70 kg MgO, 35 tons + 70 kg MgO and 7 tons of organic fertilizer + 180 N + 100 P2O5 + 120 K2O + 70 kg MgO (control). The experiment was arranged in a completely randomized block design and criteria of growth, yield, quality and pests on green tea plants were monitored. The research results revealed that the combination of 35 tons of organic fertilizer + 70 kg MgO/ hectare had good results. With this amount of fertilizer, the green tea plants exhibited good growth, tree height, canopy width, and stem diameter were equivalent to the control formula. The components of yield such as bud density (202.5 buds/m2), bud weight (0.82g/bud), and yield (1740.3 kg/ha) were high and equivalent to the control formula. While the tea quality decreased slightly (green yellow color of water, a slightly bitter, sweet aftertaste and a pleasant aroma). The rate of infestation by some harmful insects such as Chlorita flavescens Fabr. (3.3 individual/tray), Physothrips setiventris density (0.22 individual/bud), Metatetranychus bioculatus density (0.35 individual/leaf), and Helopeltis theivora (20%), they were equivalent to the control formula.

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