砧木对椪柑生长结果及叶片矿质成分的影响

通过10年田间比较试验,探明枳砧与2种惯用乔化砧(椪柑、福桔)对椪柑生长结果及叶片元素含量的影响。枳砧明显抑制椪柑树体及新梢生长,而显著增加其开花、坐果数及单株产量,且产量较稳定。半矮化枳砧椪柑叶片含氮、锰量稳定高于2种乔化砧椪柑;而前者的叶片含钾量较稳定高于后两者,含钙量呈阶段性低于后两者;镁、磷、铜、铁、硼含量差异不稳定、锌无差异。

Effects of Rootstock on the Growth, Fruiting and Leaf Mineral Content of Ponkan Mandarin

The effects of different rootstocks, i.e.semidwarf stock of trifoliate orange and two standard mandarin stocks (Ponkan and Fuju), on the growth, flowering, fruiting and leaf mineral content of Ponkan mandarin tree in southern Fujian were studied during 1982 ~ 1991.The results revealed that the growth, flowering and fruiting between Ponkan / trifoliate orange and Ponkan / Ponkan, Ponkan / Fuju showed significant differences (P< 0.05) .The trunk diameter, tree height, crown diameter and length of spring and autumn shoots of Ponkan / trifoliate orange were less than those of Ponkan / Ponkan and Ponkan/ Fuju.However, the amount of flower and fruit set per branch (about 2cm diameter) was more and fruit yield per tree was higher in the former than those of the latter two. In addition, the fruit yield of Ponkan / trifoliate orange per year was stable.Authors suggested that rational close planting may promote markedly fruit yield per ha. for Ponkan / trifoliate orange. The present study indicate that the content of N and Mn in the leaf of Ponkan / trifoliate orange was steadily higher than that of Ponkan / Ponkan and Ponkan / Fuju.The leaf K content of the former was higher than those of the latter two; in the first three years of fruiting, the leaf Ca content of the former was lower than those of the latter two.The differences of the contents of some other elements ( Mg, P, Cu, Fe, B or Zn) between Ponkan/ trifoliate orange and Ponkan/ Ponkan, Ponkan/ Fuju was not steady or nonsignificant.It is necessary to establish the diagnostic criteria of specific element (such as N) for Ponkan / trifoliate orange.