資源描述:
《不同水氮處理對(duì)水稻根系生長(zhǎng)及其產(chǎn)量的影響.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、南方農(nóng)業(yè)學(xué)報(bào)JournalofSouthernA扣cultureISSN2095—1191:CODENNNXAABhttp://www.nfnyxb.enDOI:10.3969/j:issn.2095-1191.2015.7.1184不同水氮處理對(duì)水稻根系生長(zhǎng)及其產(chǎn)量的影響梁天鋒1,陳雷1,唐茂艷1,王強(qiáng)1,張曉麗1,呂榮華2+(1廣西農(nóng)業(yè)科學(xué)院水稻研究所/廣西水稻遺傳育種重點(diǎn)實(shí)驗(yàn)室,南寧530007;2廣西農(nóng)業(yè)科學(xué)院,南寧530007)摘要:【目的】探討不同水、氮處理對(duì)水稻根系形態(tài)與活力及其產(chǎn)量的影響,為提高水、氮利用效率及推廣水稻抗
2、旱節(jié)水栽培技術(shù)提供依據(jù)?!痉椒ā恳怨饍蓛?yōu)2號(hào)為材料,采用桶栽法種植水稻,設(shè)置濕潤(rùn)灌溉(w1)和水層灌溉(w2)兩種水分條件及低氮(N1,12g/m:)、中氮(N2,20g/m2)和高氮(N3,28g/m2)3個(gè)施氮水平,共6個(gè)處理,測(cè)定不同生育期水稻根干重、根體積、白根鮮重、地上部生物量和產(chǎn)量及其構(gòu)成等指標(biāo)?!窘Y(jié)果】W1相對(duì)W2在根干重、根體積、地上部生物量和根冠比上均有所降低,但W1在水稻需水關(guān)鍵期相對(duì)W2在白根鮮重上有較大提高,同時(shí)在生長(zhǎng)后期白根鮮重仍保持較高水平。增施氮肥可顯著提高水稻根重和地上部生物量等生長(zhǎng)指標(biāo),但降低了水稻的白
3、根重和根冠比,而在低氮條件下,水稻關(guān)鍵生育期白根鮮重相對(duì)較高。W1下N2產(chǎn)量最高,W2下N3產(chǎn)量最高,且W1N2與W2N3差異不顯著(em.05);W1相對(duì)W2在有效穗數(shù)和千粒重上均有所增加,而穗粒數(shù)和結(jié)實(shí)率相對(duì)較低。【結(jié)論】濕潤(rùn)灌溉、中氮處理(W1N2)水稻中后期根系生長(zhǎng)活力較高,可實(shí)現(xiàn)水稻生產(chǎn)節(jié)水、節(jié)肥并達(dá)到高產(chǎn)的目的。關(guān)鍵詞:水氮處理;水稻;根系生長(zhǎng);產(chǎn)量中圖分類(lèi)號(hào):$511.01文獻(xiàn)標(biāo)志碼:A文章編號(hào):2095—1191(2015)07—1184—06Effectsofdifferentwaterandnitrogentreat
4、mentsonrootgrowthandyieldforriceLIANGTian-feng1,CHENLeil,TANGMao-yanl,WANGQiang1,ZHANGXiao-lil,LYURong-hua2+(iRiceResearchInstitute,GuangxiAcademyofAgriculturalScience/GuangxiKeyLaboratoryofRiceGeneticsandBreeding,Nanning530007,China;2GuangxiAcademyofAgriculturalScience,
5、Nanning530007,China)Abstract:【Objective]Theeffectsofdifferentwaterandnitrogentreatmentsonrichroot’smorphologyandactivityandrichyieldwerestudiedtoimproveutilizationefficiencyofwaterandfertilizerandprovidebasisforpromotinganti—droughtandwater-savingcultivationtechnique.【Me
6、thod]UsinghybridricevarietyGuiliangyou2asmaterials,theexperimentwithsixdifferenttreatmentswasconductedbyplantingriceinbarrel,whichincludedtwowaterconditionsviz.,wettingirriga-tion(W1),water-courseirrigation(W2)andthreenitrogenlevelsviz.,lowlevel(N1,12s/m2),mediumlevel(N2
7、,20g/m2),highlevel(N3,28g/m2).Thentherootdryweight,rootvolume,whiterootfreshweight,abovegroundbiomass,yieldandyieldcomponentsweredeterminedandinvestigatedatdifferentgrowthstages.【Result】Theresultsshowedthattherootdryweight,rootvolume,abovegroundbiomassandroot-shootratioo
8、fW1wererelativelylowerthanthoseofW2.WhilecomparedwithwhiterootfreshweightofW2.thatofW1hadmoreincreasedu