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随着施肥水平的提高,特别是化学氮肥的大幅度增加,施肥效益的下降,已成为我区农业生产上一个亟待解决的问题。据国内外研究资料报道,水稻生长过程中所需要的氮素有三分之二来自土壤。因此,研究土壤的供氮能力及其与水稻生长发育的关系,对
With the improvement of fertilization level, especially the substantial increase of chemical nitrogen fertilizer and the decline of fertilization efficiency, it has become an urgent problem to be solved in agricultural production in our district. According to domestic and foreign research reports, two-thirds of the nitrogen needed for rice growth comes from the soil. Therefore, the study of soil nitrogen supply capacity and its relationship with rice growth and development, right