不同施肥量对桂牧一号产量及氮磷钾吸收的影响

摘要

为了找到南方稻田种植桂牧一号的适合氮磷肥料配比，以湖南省长沙县金井镇循环农业科技工程基地试验田为平台，通过大田试验，研究不同施肥量对桂牧一号产量及养分吸收的影响。试验设 N0P2K、N1P2K、N2P2K、N3P2K、N4P2K、N2P0K、N2P1K、N2P3K 共8个处理。结果表明：基肥施用氮、磷肥尤其是氮肥对桂牧一号有明显增产作用，追施氮肥可以明显促进桂牧一号的再生。桂牧一号基肥施用，氮肥最佳施用量（折纯）为677.5 kg/hm2，磷肥最佳施用量（折纯）为100.4 kg/hm2。氮、磷肥的施用都可以增加桂牧一号氮吸收量，氮肥的作用较磷肥强。氮、磷肥的施用都可以增加桂牧一号的磷吸收量，磷肥的作用较氮肥强。氮、磷肥的施用可以增加桂牧一号的钾吸收量。%Taking the experim entalplots ofcircularagriculturalscientific and technology projectbase in Jingjin,C hangsha county,H unan province as the research platform ,a field experim entw as conducted to study the effectofdifferentfertilizerrates on the yield and N ,P,K absorption of G uim u-1 H ybrid Pennisetum purpureum .The treatm ents included: 1) N 0P2K ,2) N 1P2K ,3) N 2P2K ,4) N 3P2K ,5) N 4P2K ,6) N 2P0K ,7) N 2P1K and 8) N 2P3K .Itw as show ed thatthe application of nitrogen and phosphorus,especially nitrogen increased the biom ass yield ofG uim u-1 obviously.Topdressing nitrogen im proved the regeneration ofG uim u-1 significantly.Forthe basalfertilizerapplication of G uim u-1,the recom m endation offertilizerratesw asgiven asN 677.5 kg/hm 2,P2O 5 100.4 kg/hm 2 respectively.B oth application ofnitrogen and phosphate fertilizer could increase N absorption,and nitrogen fertilizer w as of stronger effectthan thatof phosphate fertilizer.Their application could also increase P absorption, and phosphate fertilizer exerted larger im pact than nitrogen fertilizer on G uim u-1 in P absorption.The application ofnitrogen and phosphate fertilizercould increase the K absorption ofG uim u-1.