沙打旺水肥协同效应研究——水肥协同效应对产量及土壤养分的影响

Study on Coordinated Effect of Water and Fertilizer on Astragalus Adsurgens :Influence of Coordinated Effect of Water and Fertilizer on Yield and Soil Nutrient.

本文通过盆栽研究了沙打旺水肥协同效应.结果表明,肥料的增产效应皆随水分量的提高而增加;在低水分时,肥料增加到一定水平出现负效应,在高水分还末出现负效应;在水肥协同效应中,水分效应大于肥料效应。二年生(三茬)沙打旺水肥协同效应中,土壤营养元素的降低率氮<钾<磷;在低肥时,氮、磷降低率大,钾则小;在高肥时,氮的降低率小.

The present paper deale with prelimiary study on coordinated effect of water and fertilized on Astragalus adsurgens. The result slowed that the Yield enhancing effect of fertilizer was positively related with amount of irvagated water. The fertilizer increased to a fairly high level showed negative effect on plant in lower water content. The water effect was greater than fertilizer effect on the coordinated effect of water and fertilizer. The ossing oyder of soil nutritive elements was nitrogen<potassium<phosphorus in the coordinated effect of water and fertilizer on two years (there stuble) of Astragalus adsurgens Nitragen and phosphorus elements lost more quickly at lower fertilzer lewel.