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(1)在海南岛西部硅铝质砖红壤上对 PR107橡胶树的施肥试验表明:施用化肥都有增产效果,在常规割胶条件下,N肥增产5.1％,NP肥为7.4％,NPK肥为6.6％;其中NP肥在头三年时增产率达7—10％,NK肥在第5年(1977年)增产率亦达10％。所以认为在海南岛西部硅铝质砖红壤上对无性系PR107胶树的化肥施用以NPK完全肥料为好,前几年重点在氮磷肥配合,几年以后配合钾肥,使用刺激剂割胶更是如此,单施氮肥较差。 (2)根据叶片分析养分含量营养诊断看,试验区胶树的氮素、钾素、镁素营养均在中等偏高的水平,而磷素营养则显缺乏,试验结果亦表明,头几年施用磷肥有较明显的效果。叶片中含磷量与产量的相关系数亦较高(r=0.66)。 (3)施肥对于胶含量和再生皮生长的影响不明显。但施肥对茎围增长有影响,特别是施用氮肥和磷肥使茎围增粗5％左右,而钾肥似有负效应。 (4)施肥可以提高橡胶树叶片养分含量。但在本试验中提高的幅度还不明显,仅3—10％左右,这可能是由于试验地胶树原来的营养状况已较为良好的缘故。
(1) The fertilization experiment of PR107 rubber tree in the red soil of SiAl-bricks in the western part of Hainan Island showed that all the fertilizers had the stimulation effect. Under the conventional tapping condition, the yield of N fertilizer increased 5.1%, NP fertilizer was 7.4% and NPK fertilizer was 6.6 %; Of which NP fertilizer yield in the first three years of 7-10%, NK fertilizer in the fifth year (1977) yield also reached 10%. Therefore, it is considered that the NPK complete fertilizer should be applied to the fertilizers of clonal PR107 gum tree on the red soil of western Liaoning Province, which is based on nitrogen and phosphorus fertilizer. A few years later, it is especially suitable for the application of potassium fertilizer and excitant tapping , Poor nitrogen fertilizer alone. (2) According to nutrition analysis of nutrient content of leaves, the N, K and Mg nutrition of gum tree in the experimental area are all in the medium high level, while the phosphorus nutrition is obviously lacking. The test results also show that in the first few years Phosphate fertilizer has a more obvious effect. The correlation coefficient between phosphorus content and yield in leaves was also higher (r = 0.66). (3) The effect of fertilization on the content of plastic and the growth of regenerated skin is not obvious. However, fertilization on the growth of the stem circumference affect, especially the application of nitrogen and phosphorus fertilizer stem thickening around 5%, while potassium may have a negative effect. (4) fertilization can increase the nutrient content of rubber tree leaves. However, the extent of increase in this experiment is not obvious, only about 3-10%, which may be due to the original nutritional status of the gum tree has been relatively good reason.