曲周试区玉米秸秆不同还田方式对土壤氮素影响的探讨

在中国农业大学曲周试验站的潮土上进行2种不同模式的玉米秸秆还田试验,为期1年。结果发现玉米秸秆还田后前期由于能减少可溶性N的淋失,后期又释放出N,从而提高了N的利用率。土壤NO3--N含量随作物生长季节变化明显,而NH4 -N具有稳定性;土壤微生物N变化同秸秆分解状况相一致。多数时间内整翻处理的微生物N高于粉碎处理。

EFFECT OF PATTERNS OF USING CORN STALKS AS MANURE ON SOIL N

Two different patterns of using corn stalks as manure (incorporation into the soil) were tested on fluvo-aquic soil at the Quzhou Experiment Station of the China Agriculture University. The one-year experiment showed that N recovery rate increased because leaching of soluble N was low in the initial period of the incorporation of corn stalks and release of N increased in the late period. The content of nitric nitrogen in the soil varied remarkably with the crop-growing season, while ammonium nitrogen remained steady. The variation of microbiological nitrogen in soil coincided with the process of decomposition of the corn stalks. In most of the time, the plot with whole stalks incorporated in higher in microbiological content than the plot with smashed stalks incorporated.