绪言在印度北部平原的苗圃中,供春季栽植用的杨树和柳树插条,向来是沿用上一年秋季的采条,然后在户外假植越冬的方法。但是,这些插条常常在没栽植前就已打破休眠而萌动生长。结果,这样的插条不仅生根差,而且难以用插条机进行大面积栽植。 INTRODUCTION Poplar and willow cuttings used for spring planting in the nurseries of the northern plains of India have traditionally been planted in the autumn of last year and then planted outdoors for winter planting. However, these cuttings often break dormant and germinate before planting. As a result, such cuttings not only have poor rooting, but also are difficult to grow on a large area with an insertion machine.