Abstract: ObjectiveEffects of water and fertilizer drip irrigation on growth of mini-seedling polybag-raised bud-dings were analyzed to provide reference for water saving,high efficiency and fertilizer saving rubber tree seedlings.MethodDifferent culture substrates,different types of fertilizer,irrigation amount,irrigation time,irrigation frequency were set on mini-seedling polybag-raised rubber buddings using orthogonal experiment design. Growth of scion,root shoot ratio,taproot length,taproot weight,volume of root and leaf nutrient of all the treatments were determined to select the optimal water and fertilizer drip irrigation treatment for mini-seedling polybag-raised rubber buddings.ResultFor the mini-budding seedling polybag-raised plant cultured in media with surface soil,they were dripped 100ml compound ferti-lizer every 10 d.The plant height and stem diameter were 30.87 cm and 3.47 mm,they had 2.15 leaf whorls and survival rate was 100%.The root shoot ratio,taproot length,taproot weight,volume of root were 31.10%,30.52 cm,6.48 mm and 4.00 mL,and contents of nitrogen,phosphorus,potassium,calcium and magnesium in leaf were 4.60%,0.24%,1.82%, 0.47% and 0.18%.Mini-seedling polybag-raised rubber buddings had fine growth performance,but the contents of calcium and magnesium in leaf were low. Coir dust media was beneficial for growth of root in general,but the conditions of other upper parts were worse than those in mix media.ConclusionSurface soil as media substrate,compound fertilizer containing appropriate calcium and magnesium contents is the optimal condition for growth of mini-seedling polybag-raised rubber buddings.This method can be promoted in mini-seedling polybag-raised rubber buddings.