水稻土肥力与水稻计量施肥参数的测定

Tests on the Fertility of Paddy Soils and Parameter of Metrical Fertilization for Rice

本试验于1987～1989年在寻甸县北亚热带地区的草甸型水稻土上进行,得到下列结果:水稻土缺乏有效氮和有效磷,具有足够的有效钾和有机质,测定了施肥公式中的主要参数:定产公式中的参数,稻谷(含稻草)吸收的养分数量,化肥利用率,肥料的养分含量以及土壤有机质的当季矿化率,把这些参数的测定值代入公式,即可得到在水稻集约栽培条件下,每亩主要肥料的推荐施肥量是:尿素12～17kg(含N6～8kg),普钙24～33kg(含P_2O_54～6kg),硫酸钾0kg,厩肥0.8T。

Field experiments were carded out for three years from 1987 to 1989 at XinDian county on meadow paddy soil in the north subtropical areas, the results are as follows. These paddy soils are deficient in available nitrogen and available phosphorus,abundant in available potassium and organic matter. Major parameters arc tested in equation of fertilizer requirement, and equations ofpredictable yield, contents of nutrients that may be taken up by rice grain (including straw) , absorption rate of nutrients, nutritional content of barnyard manure and mineralization rate of soil organic matter in the season. Values derived from these tested parameters are transformed into equations, by which, one may recommend an intensive culture practive of rice with the following dresssings of the major fertilizers, per mu: 6 to 8 kg of N, 4 to 6 kg ofP_2O_5, 0 kg ofK_2O, 0.8 ton of barnyard manure.