Establishing Precision Fertilization Formulas for Private Rubber Plantations of Danzhou County Based on Geographic Information System(GIS)
Large variations in soil fertility are found within private rubber plantations in Hainan Island.However,the utilization of soil testing formula fertilization in private rubber plantations is quite low.In order to increase the precise fertilization of private rubber and to save resource,the research targeting on private rubber plantation in Danzhou County,taking the widely planted RRIM600 rubber tree variety as the example,making use of the statistics and spatial analysis function of Arc GIS,combining the leaf nutrition diagnosis with leaf nutrient ratio,and referring to the plantation soil nutrient status,32 fertilization formulas were established for the 146 villages which are suitable for planting rubber in Danzhou.The ratio of N ∶ P2O5∶ K2 O ∶ Mg O is about 1 ∶(0.2~0.6) ∶(0.4~0.9) ∶(0.1~0.4).The fertilizing amount of the corresponding fertilizer is urea(N≈46%)0.4~0.7 kg,superphosphate(P2O5≈12%)0.5~1.1 kg,potassium chloride(K2O≈60%)0.15~0.3 kg,magnesium sulfate(Mg O≈16%)0.1~0.5 kg,and total fertilizer inputs of one rubber tree per year is about 1.3~2.3 kg.The study made a exploration of soil testing formula fertilization popularization in private rubber plantation under the support of GIS.