田菁及其与硫铵混合施用时水稻对肥料氮和土壤氮的利用

UTILIZATION OF FERTILIZER AND SOIL N BY RICE WHEN APPLYING SESBANIA WITH AND WITHOUT(NH4)2SO4

应用标记15_M的田菁和硫铵进行一季水稻盆栽试验的结果表明,1.田菁和硫铵单独施用,田菁氨素的17.6％和41.8％分别为稻秆和谷粒利用,硫铵氨素的分别为15.1％和29.0％。这两种肥料氮在谷粒中分布的比例较大,稻杆和谷粒对田菁氨的利用率都高于硫铵氮.2.施用硫铵有促进水稻吸收土壤氨素的作用,比不施氨对照增加71.8％;相反,施用田菁减弱了水稻对土壤氨的吸收,比对照减少37.1％。3.田菁和硫铵混合施用,除了可使水稻对田菁氨的吸收增加(5.2％)。对硫铵氨的吸收减少(5.3％)外,亦有促进水稻增加吸收土壤氨素的作用,4.与硫铵单独施用的结果相比,这两种肥料混合施用,可以在消耗较少量土壤氨素的基础上,更好地维持水稻生长所需的氨营养供应。

Results of one crop rice pot experiment with labeled 15M Seabania and (NH4)2SO4 show,1.with single dressing of sesbania or (NH4)2SO4 the percentage uptake of Setania-N by rice straw and grain were 17.6 and 41.8 respectively;of (NH4)2SO4-N 15.4 and 29.0.So,bigger N distribution of both fertilizers in rice grain was presented;the efficiency of Seabanoa-N utilized by rice and grain were higher than those of (NH4)2SO4-N;2.Application of (NH4)2SO4would enhance soil N uptake by rice,as 71.8% increase over the control (no N addition).But applying Sesbania reduced rice to absorb soil N,as 37.1% decrease over the control; 3.By mixed application of Sesbania and (NH4)2SO4,the increase of Sesbania-N (5.2%) and decrease of (NH4)2O4-N (5.3%) uptake by rice were obtained; and the soil N uptake by rice was also enhanced;4.Compared with the single dressing of (NH4)2SO4,the mixed application of both fertilizers enhanced rice crops to obtain nitrogen supply better for their growth with less soil N consumption.