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积极发展杨树、大量发展杨树,是我国绿化大跃进中的一个重要任务。几年来,对于杨树的大量采种育苗,从摸索试验中,逐步创造和积累了不少的成功经验,苗木质量和产量都逐年有所提高,而播种施用量却在逐年减少,由过去的每公顷30—50公斤,至目前已降低到一般只用18—28公斤;但是在目前需种量大大增加,而采种量还受到一定限制之时,如何挖掘潜力,使播种量降低到更合理的标准,是今年三月间全国杨树种苗
Active development of poplar, a large number of poplar development, is an important task in our country’s greening great leap forward. In recent years, a large number of seedlings of poplar seedlings from the groping experiment, and gradually created and accumulated a lot of successful experience, seedling quality and yield have increased year by year, but the amount of sowing is decreasing year by year, from the past, each Hectare 30-50 kilograms, so far has been reduced to generally only 18-28 kg; but at present the need to greatly increase the species, and the amount of seed is also subject to certain restrictions, how to tap the potential to sow the amount of more reasonable Standard is the poplar seedlings in March this year