PR107中龄开割橡胶树最佳割胶制度

采用单位面积和单株产量与劳动生产率相结合的相对经济效益评价方法，对橡胶树PR107中龄开割树5种不同的割胶制度——S／2 d／2、S／2 d／3 ET2．00％、S／2 d／4 ET2．50％、S／2 d／5 ET3．00％、S／2 d／6 ET3．50％连续3a的试验结果进行分析评价，结果表明：当割胶劳动报酬占产值的比例(Ⅰ值)在28％以下时，S／2d／3 ET是中龄PR107的最佳削制：当Ⅰ值超过29％时，其最佳割制为S／2 d／6 ET。此外，试验结果还表明，采用乙烯利刺激的4种割制涂药后，同一割次的产量无显差异：不同割制间，对茎围生长、死皮停割树的增加等副性状的影响无显差异。

Optimal Tapping System for Premium Plantations of Hevea Clone PR107

The relative economic benefit assessment method in which the yield per unit area or per tree and labor productivity are considered was used to assess the 3-year experiment data of 5 tapping systems (s/2 d/2, s/2 d/3+ ET 2.00 %, s/2 d/4+ET 2.50 %, s/2 d/5+ET 3.00 % and s/2 d/6 + ET 3.50 %) for premium rubber plantations of clone PR107. The results showed that the optimal tapping system was S/2 d/3+ET2.00 % when the proportion of tapping reward to production value (I value) was lower than 28 %. However, S/2 d/6+ET3.50 % was optimal when the I value was over 29 %. Moreover, the results showed that the dry rubber yield of the same tapping order after using stimulant were of no significant difference among the 4 stimulated systems. Other secondary characters such as stem growth and tapping panel dryness were of no significant difference among all tapping systems.