Quality of rice and mango on Alum and Alluvial soils in the Mekong Delta.

  • For Zinc (Zn): On alum soils, praying 0,5% ZnSO4.7H2O; increased rice yield by 13,6% and on alluvial soil the yield increased by 12,5%. On mango trees, sprayed with 0,5% ZnSO4.7H2O; resulted in an 8,4% increase in mango yield on alum soils and 11,5% increase in alluvial soils.
  • For Boron (B): On alum soils, spraying 0,5% H3BO3 increased yield by 10,6% and on alluvial soil the yield increased by 13%. On mango trees, using concentrations of 0,5% H3BO3 and 1% H3BO3 increased the yield of mango by more than 10% on both alum soil and alluvial soil.
  • For iron (Fe): On the soil with iron acid that causes rice poisoning, spraying 0,1% FeSO4.7H2O; has reduced the yield of summer-autumn rice crop by 4,7%. On the alluvial soil, the yield increase was not significant. On mango trees, a lum soil, mango yield increased by 7,5%; on alluvial soil, increased by 6,8% sprayed with water.
  • For Magan (Mn): On wetlands Mn is not a limiting factor for crop yield, spraying 0,1% MnSO4.1H2O to rice plants on alum soils increased yield by 4,3% and on alluvial soils the yield increased by 6,8%. On mango trees, sprayed with 0,1% MnSO4.1H2O on alum soil increased yield by 5,5% and on alluvial soil 10,3% yield increased sprayed with water.
  • For copper (Cu): Copper plays an important role in increasing the yield of rice and mango, both in alum soil and alluvial soil. On alum soil, spraying with 0,01% CuSO4.5H2O supplement for rice yield increased by 9,7%. On alluvial soil, rice yield increased by 11,3%. On mango trees, sprayed with 0,01% CuSO4.5H2O, mango yield increased by 10,8% in alum soil and 14,7% in alluvial soil compared to the control sprayed with water.

Fig. Experiments on micronutrients affecting rice yield in the field.