“瓦碱”是一种碱化的浅色草甸土,零星分布于我国黄淮海平原的盐碱土地区。瓦碱的土表板平,呈灰白色,没有盐霜或很少盐霜。早春干旱时,土表易于板结,抑制幼苗生长,常引起缺苗现象,土壤板结严重时,甚至全部死亡,形成光板地。瓦碱上难以出苗,卽使出苗,苗也弱,分蘖少,但是出苗以后植株的生长此在附近盐土上好得多,因此羣众说:“瓦碱发老苗,不发小苗”。黄淮海平原内瓦碱的情况已有报导,但少有详细的理化研究。本文拟就瓦碱苗弱和不出苗的原因及其改良原则进行初步研究。 “Vat alkali” is a light alkalized meadow soil, sporadic distribution in China’s Huang-Huai-Hai Plain saline-alkali soil area. Tile base of the soil surface flat, gray, no salt cream or very little salt cream. Early spring drought, the soil surface easy to knot, inhibit seedling growth, often caused by lack of seedlings phenomenon, soil compaction serious, or even death, the formation of light board. Vallisal is difficult to germinate, 卽 so that seedlings, seedlings are weak, less tillering, but after the emergence of plants in the vicinity of salt so much better soil, so the masses said: “Vat alkali hair seedlings, no hair seedlings.” Huanghuaihai Plain Nevatase has been reported, but few detailed physical and chemical studies. In this paper, the reasons for the weak and no seedling emergence and the principle of improvement were studied.