论文部分内容阅读
以北方水田土壤为试材,用室内模拟和盆栽试验测定结果表明,细绿萍在280℃有效积温下释氮达高峰,占其全氮量的40%,经10—12周矿化,残留率为52.6%,土壤结构系数提高7.67—36.13%.用~15N肥示踪测出,硫铵的利用率为39.1—29.3%,细绿萍为32.3—28.1%;硫铵激发率为24.4—28.1%,细绿萍为12.3—12.9%,但仍有残留积累.在盐土型水稻土中,细绿萍磷主要转化成Ca-P_Ⅱ组,大约有45%以有机磷残留于土壤中.用~32P标记法测得水稻对细绿萍的磷素利用率为20%左右,与过磷酸钙相当.细绿萍腐解7天,释钾量为其全钾量的65.5—89.1%.在水稻生育前期,萍钾释出主要增加土壤速效钾,后期则对缓效钾贡献较大,其肥效与化学钾肥相当.
Taking the paddy soils in northern China as test materials, the results of indoor simulation and pot experiment showed that the content of nitrogen released by Nitraria peaked at 40 ℃ of effective accumulated temperature at 280 ℃, accounting for 40% of its total nitrogen content. After 10-12 weeks of mineralization, The rate of soil structure was increased by 7.67-36.13%, and the utilization rate of ~ 15N fertilizer was 39.1-29.3% for ammonium sulfate and 32.3-28.1% for Phyllanthus niruri, and that for ammonium sulfate was 24.4- 28.1% and 12.3-12.9%, respectively, but there are still residual accumulations.In the saline-soil paddy soil, fine green pingpophine mainly transformed into Ca-P_Ⅱgroup, and about 45% remained in the soil with organophosphorus. ~ 32P labeling method measured the rice phosphorus utilization of fine green algae is about 20%, and the superphosphate is equivalent to fine green Ping decay 7 days, the amount of potassium is 65.5-89.1% of its total potassium in In the early stage of rice growth, potassium release mainly increased soil available potassium, but later contributed more to slow-acting potassium, which was equivalent to chemical potassium.