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一、推荐的种植材料 (一)本所根据最近五年的试验结果,对1969年推荐的橡胶种植材料作了修订。这次推荐的大规模种植材料与1969年的相同,只是对小规模种植和试验规模种植的无性系作了修订。这次推荐的种植材料如下: I级(大规模种植,占更新面积的80％):GT1,PR228,WR101,LCB479,LCB1320 (仅限于无风害地区)。 II级(小规模种植,占更新面积的20％,按优先次序分为甲、乙、丙三组): 甲组:PR255、259、261、300、303、305,
I. Recommended Planting Materials (a) According to the test results of the last five years, our institute revised the recommended rubber planting materials in 1969. The recommended large-scale planting material was the same as in 1969, except that the clones planted on small-scale and pilot-scale were amended. The recommended planting materials are as follows: Class I (large-scale cultivation, accounting for 80% of the renewed area): GT1, PR228, WR101, LCB479, LCB1320 (windless area only). Class II (Small-scale cultivation, accounting for 20% of the renewed area, divided into A, B and C groups according to priority): Group A: PR255,259,261,300,303,305,