ISSN: 2593-9173
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In Vietnam, basaltic soil is rich in total phosphorus (P), but poor in available P, because of fixing. Most of crops on the soil have symptom of P deficiency. Rock phosphate (RP) was a slow release P fertilizer and has a longer residual effect. This is to research on effect of RP’s to corn and groundnut on basaltic soil in Vietnam. Two parallel experiments with 9 treatments of Control, Super Single Phosphate (SSP), Vietnam RP, Morocco PR, Tunisia PR, Jordan PR, Algeria PR, Senegal PR and Togo PR were conducted during 2015-2016. The experiments were designed to Randomized Complete Block (RCB) with 4 replications and the plot area of 100 m2. The backgrounds consisted 180 N-90 K2O for corn and 45 N-60 K2O for groundnut. Except control, phosphorus dose was 90 P2O5. Study results showed that applying 90 kg P2O5 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%. Output of 1 kg P2O5 in RP form was 5.2-10.4 kg corn grain. Supplying 90 kg P2O5 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%. Efficiency of 1 kg P2O5 in RP form was 2.1-2.3 kg groundnut bean. The difference of corn and groundnut productivity among SSP and RP treatments was insignificant.