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近年来,农业生产上对磷肥需求日趋增多,但反映石灰性土壤对磷素有较强的固定作用,为了搞清其固定的程度,1976年以来,进行了有关的试验。材料和方法试验设在扶风县陵角大队。土壤为塿土,肥力低,新平整的生土地。试验设10个处理(表1)。小区面积0.015亩,重复两次,随机排列。试验地1976、1978两年中全部休闲,只中耕除草保墒。1978年10月开始种麦,其后每年按麦秋两料轮种,3年共种6料。每料亩施尿素20斤,其他同大田。在每小区用砖砌2平方尺的休闲采土区,分别于1978年的1月、10月、1979年的6月、10月和1980年的 6月,采各处理耕层(0—20厘米)土样,用Olsen法测定土壤有效磷。
In recent years, the demand for phosphate fertilizer in agricultural production is increasing day by day, but it reflects that calcareous soil has a stronger role in fixing phosphorus. In order to clarify its degree of fixation, relevant tests have been carried out since 1976. Materials and methods test in Fufeng County Ling Kok brigade. Soil for soil, low fertility, the new formation of the land. The experiment set 10 treatments (Table 1). The plot area of 0.015 acres, repeated twice, arranged randomly. Experimental land in 1976 and 1978 all the leisure, only cultivating weed moisture. Wheat began to be planted in October 1978, followed by two rounds of wheat and autumn rotations each year, for a total of six species in three years. Urea per mu fertilizer 20 pounds, the other with the field. In each plot with brick 2 square feet of leisure mining area, respectively, in January 1978, October, 1979, June, October and June 1980, mining each processing topsoil (0-20 Cm) soil samples, measured by Olsen soil available phosphorus.