Coffee trees have high nutrient requirements, including boron (B). A field experiment with 2 factors of applying methods (leaf and root) and doses (0, 1, 2 and 3 kgs B ha -1 yr -1 ) was implemented on basaltic soil in Central Highlands of Vietnam during 2015-2016. The results showed that supplying B remained appropriate B content in leaves, reduced in curly leaves and dropped fruits and increased in coffee productivity by 2.3-10.2% in comparison with control. The treatments of supplying 3 kg ha -1 got highest productivity, 3.87 t ha -1 . In addition, the efficiency of B to coffee was quite clear, 76.7-85.0 kg coffee kg B -1 in the cases of root applying and 95.0-123.3 kg in treatments of leaf spraying. Leaf spraying increased in yield of 0.11-0.23 t ha -1 , corresponding the profit of 94.5-247.3 USD ha -1 in comparison with root applying.
ConclusionsOn basaltic soil in Vietnam, applying 90 kg P 2 O 5 in RP form improved N and P content in corn leaves, increased biomass by 20.6-22.0% and corn productivity by 7.8-15.5% in comparison with the control. The output of 1 kg P 2 O 5 in RP's form was 5.2-10.4 kg corn grain. Supplying 90 kg P 2 O 5 in RP form increased groundnut biomass by 43.5-48.5%, root nodulation by 109.3-115.0% and productivity by 15.5-16.8%. The efficiency of 1 kg P 2 O 5 in RP's form was 2.1-2.3 kg groundnut bean. The difference of corn and groundnut productivity among SSP and RP treatments was insignificant.
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