Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2019, Vol. 40 ›› Issue (4): 623-628.DOI: 10.3969/j.issn.1000-2561.2019.04.001

• Crop Culture and Nutrition,Genetic Breeding •     Next Articles

Formula Fertilizing of N, P and K Promoted Properties of Natural Rubber

HUA Yuangang,BEI Meirong,LIU Hailin,YANG Hongzhu,LIN Qinghuo,CHA Zhengzao()   

  1. Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences / Soil and Fertilizer Research Center, Chinese Academy of Tropical Agricultural Sciences / State Key Laboratory Incubation Base for Cultivation & Physiology of Tropical Crops, Haikou, Hainan 571737, China
  • Received:2018-09-28 Revised:2019-01-16 Online:2019-04-15 Published:2019-05-21
  • Contact: Zhengzao CHA

Abstract:

The effects of NPK fertilizer applying on the properties and molecular weight of natural rubber were studied using an orthogonal test design on the eight years PR107 rubber trees. Different types and levels of fertilization had a significant effect on dry rubber content. The optimum combination of dry rubber content was urea 300 g/plant, calcium superphosphate 250 g/plant, and KCl 75 g/plant. The optimum combination of P0 was calcium superphosphate: 375 g/ plant, KCl 25 g/plant, and that of mooney viscosity was calcium superphosphate 250 g/plant, KCl 25 g/plant, but none of urea for both of them. The optimum combination of PRI was urea 200 g/plant, calcium superphosphate 375 g/plant, and KCl 50 g/plant. Fertilization also had a significant effect on the molecular weight of rubber, and the optimum combination of Mn was calcium superphosphate 125 g/plant, KCl 25 g/plant, but none of urea. The optimum combination of Mw and Mv was urea 300 g/plant, calcium superphosphate 250 g/plant, and KCl 25 g/plant. When producing rubber or latex products, suitable planting environment and fertilization measures could be chosen to produce raw materials according to the requirements of different products.

Key words: N, P, K, raw rubber, property, molecular weight