毛白杨多圃系列育苗技术要点张凤英（渭南地区林技站）多圃系列育苗，是指利用采穗圃、砧木圃、繁殖圃，并以１：５：５０的面积比例，进行的苗木繁育。现将毛白杨多圃育苗技术要点分述如下。先一年冬深耕育苗地３０ｃｍ。春耕前，每公顷撒施美国二胺３７５ｋｇ或有机肥７... Nursery poplar multi-nursery series of seedling technical points Zhang Fengying (Weinan Lin Forest Station) Nursery nursery series, refers to the use of cutting nursery, anvil nursery, breeding nursery, and 1: 5: 50 area ratio of seedling breeding. The poplar nursery nursery skills points are as follows. The first year of deep plowing seedlings 30cm. Before spring, apply 375kg of organic diamine or organic fertilizer per hectare 7 ...