Abstract
The research objective was to make a formula for economical complex soil conditioner of bio-organo mineral for tea, coffee and cacao plantations. The soil conditioner (SC) formula for such plantations was made by mixing the urea, phosphate, leucite and kieserite with the ratio of 25:7:12:3. The experiments at Block B5 showed the amount of harvested dormant leaves was 3.37 kg/100 m2 while the control yielded 2.29 kg/100 m2. There is a difference around 1.08 kg/100 m2 or 47%. The amount of Peko shoots was 19.82 g/100 m2 when using the soil conditioner while the control had 14.89 g/100 m2 performing the difference 33% while at Block A10, the amount of harvested dormant shoot was 3.53 kg/100 m2. There is a difference around 3.29 kg/100m2 or 7%. The amount of Peko shoot was 18.25 g/100 m2 while the control acquiesced 15,05 g/100m2 – the difference of both was 21%. The Robusta grew from 25.4 cm to 28.5 cm when using the BIOM-SC. but the plant height is only from 24.4 cm to 26.8 when using NPK fertilizer.
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