柑桔根砧試驗（第一報）

Rootstock Trial on Citrus (I)

本試驗於五十二年開始進行，以桶柑、椪柑為接穗，以美女桔、酸桔、廣東檸檬、八朔、椪柑、粗檸檬、苑圃暖檬及可生甜橙等八品種為根砧，在士林苗圃培植幼苗。五十五年春季定植於陽明山試驗區，其初步觀察的結果如下：1.從砧穗親和性上觀之，則以椪桔根砧為最佳，但從生長速度觀之，則以粗檸檬根砧為上選。2.桶柑嫁接於廣東檸檬、苑圃暖檬及粗檸檬等三種根砧上，其生長速度均較快，但接於美女桔與八朔二種根砧上則生長緩慢。

The Sunki (C. reticulata var. Sunki (Hayata) Toung) has been commonly used as a citrus rootstock in Taiwan for several hundred years. Since the rapid decline of the citrus . was found in the most citrus grow mg area m Taiwan during the past twenty years, it has been generally considered that such a decline would be, directly or indirectly, associated with the rootstock. It, therefore, becomes necessary that the Sunki rootstock should be re­evaluated and a suitable substitute should be recommended for use. For this recognition, a well-designed citrus rootstock trial has been carried out for four years, from 1963 to present, at the Shihlin Horticultural Experiment Station, Taipei, Taiwan, China. The preliminary results are summarized as follow: (1) The Tankan on the rough Iemen rootstock grew rapidly and strongly, though the union point showed insufficient conginiality as the present measurament concerned. (2) The Tankan on the rough lemon, Canton lemon and rangpurhme rootstock increased in size much more rapidly than on the Cleopatra and Hassaku rootstock.