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前言 白善土为我省的主要水稻土类型,多分布于中部及东南部的丘陵地区和西北部的平缓岗地,除恩施专区外,其它各地均有零星分布。 白善土(亦称白散土)土质疏松,耕作良好,利用集约,一般熟化程度很高,为稻、麦、油料作物之基本农田,由于所处自然地理条件优越,能一年两熟或三熟,产量稳定,生产力很高,在粮食作物生产上有举足轻重之地位,群众称它为“万能土”“饭碗土”。 不同类型的白善土,在肥力上,理化性状上,存在着很大的差异性,因而产量水平亦相差甚远。为了充分挖掘土壤潜力,进一步提高土壤肥沃性,达到大面积平衡增产的目的,为此,对白善土的形成演变过程,农业生产特性及改良等方面进行深入的研究,就显得十分必要。
Preface Bai Shantu is the main type of paddy soil in our province. It is distributed in the hilly areas in the central and southeastern part and the gentle posts in the northwest, except for Enshi prefecture. Other places are sporadic. White soil (also known as white soil) loosen soil, good farming, intensive use, the general level of maturity is a basic farmland of rice, wheat, oil crops, because of its geographical and natural conditions, can be two or three crops a year With stable output and high productivity. It has a pivotal position in the production of grain crops. The masses call it “universal soil” and “rice bowl soil.” Different kinds of white sand soil have great differences in terms of fertility and physicochemical properties, so the yield levels also differ greatly. In order to fully tap the potential of the soil, further improve the fertility of the soil and achieve the goal of large area and balanced increase of production, it is very necessary to do an in-depth study on the formation and evolution of the white sandy soil, agricultural production characteristics and improvement.