印楝扦插育苗及造林观察

Study on Sapling Breeding by Cutting and Afforestation of Azadirachta indica

以印楝树冠顶部1年生木质化、半木质化枝条及树冠下部木质化枝条作插条,用不同种类、不同浓度的生长调节剂处理,在两种基质上作扦插育苗对比试验.结果表明:不同基质上的插条生根天数存在显著差异,树冠不同部位的插条、不同生长激素及浓度、不同育苗基质间插条的生根率也存在显著差异.基质以无菌的细河沙为好;生长激素以1g/L吲哚丁酸为好;插条以树冠顶部1年生木质化枝最佳,其生根率可达95%.初步观察表明:定植后,扦插苗幼龄林与实生苗幼龄林相比生长无明显差异.

A sapling breeding experiment was done by cuttings made of semi-lignified branches taken from top of the crowns and annual lignified branches taken either from top or bottom of the tree crowns of Azadirachta indica.The cutting materials were treated with different concentration solutions of plant growth regulator prior to the cuttage done on two types of substrates. It was showed by the experiment that:The rooting time for the cuttings on different substrates was significantly different.The significantly different rooting rate was closely related to concentrations of plant growth regulator and quality of substrate, the regulator concentration of 1g/L and the disinfected fine sand as substrate got the best rooting results respectively.The cutting materials from different parts of the crowns also led significant different rooting rates, and the rooting rate of cuttings made of annual lignified branches from crown top reached 95%.The preliminary investigation into afforestation effect indicated that there was no meaningful difference in the growth of plantations by seedlings and cutting saplings.