论文部分内容阅读
我场是在北部湾北岸广西合浦南部沿海地带。在1968—1972年间,种植了大量橡胶,是以橡胶为主的农场,但植胶条件很差,除有风害,寒害以外,还有土地沙瘦(是有机质含量在1.5％以下的沙壤土),养分低微,荒坡草少,有机材料来源困难等缺点。加上种后管理不周,施肥不足又不当,结果普遍出现了黄叶病,发病率达32.8％。因而长期以来生长很差,增粗很慢,每年增长围径只
My field is in the northern coast of Beibu Gulf, southern Guangxi Hepu coastal areas. Between 1968 and 1972, a large amount of rubber was planted, mainly rubber-based farms. However, the gelatinization conditions were very poor. In addition to wind and cold damage, the land was thin (sandy loam with organic matter content of 1.5% or less) , Low nutrients, less wasteland and grass, organic materials and other shortcomings of the source. Coupled with poor management after planting, inadequate and inappropriate fertilization, the results of the general emergence of yellow leaf disease, the incidence rate of 32.8%. As a result, its growth has been poor for a long time and its growth has been slow. Its annual growth rate is only limited by its circumference