马铃薯看叶施肥技术的初步研究

摘要对不同叶龄的施肥效果表明,浙江马铃薯追肥宜早不宜迟.以6～7叶顶叶展平为标志施肥对地上茎叶生长的促进作用显著,现蕾后地下块茎生长比其它叶龄追肥为优,干物质分配合理.追肥迟不仅产量降低,而且小薯比例增加.因此,6～7叶龄期为最适追肥期.该结论在生产上已初步得到验证.

A PRELIMINARY STUDY ON POTATO FERTILIZING TECHNIQUE BY DIAGNOSING LEAF AGE

The study on fertilizing in different leaf ages of the potato showed that the topdressing of chemical nitrogen and potasium was better in early than in latter. At the time between the sixth and seventh leaf's top-leaflet unfolding, the topdressing could enhance the stem and leaf growth significantly; the tuber growth and dry matter distribution were also bctter compared with topdressing at other leaf ages. The result showed that late topdressing not only reduces the tuber yeild but also increassthe small tuber ratio. Thus, the sixth to seventh leaf age was the most suitable topdressing period. This result was verified by field production.