Abstract
A pot experiment was conducted, using three soyabean (Giycinc max (L.) Merrill) cultivars (Forrest, Prima and A5409) inoculated at planting, with no (0) and two Bradyrhizobium japonicum strains (WB1 and WB74). The objectives were to investigate the effect of cultivar-rhizobial strain combinations on biomass and N derived from the atmosphere (Ndfa) and to compare the atmospheric N uptake determined by the isolope technique, with the conventional method.
Highlights
A pot experim ent was condttcted, using three soyabean (Giycinc max (L.) Merrill) cultivars (Forrest, Prima and A5409) inoculated at planting, with no (0) and tw o Bradyrhizobium japonicum strains (W B I and WH74)
Id ealcond itio nsneeded to a p p ly the c o n ve n tio nalme th o d d o not occur in fie ld situ a tio nsand th erefo re the i.w tope technique is preferred
’n Polproel'is uitgevoer om; (1) die die aanpasbaarhcid van .sekcre simbioliesc pare op opbrengs, N- en protcieninhoud van die saad te cvalucer en (2) die laerkostc konvcnsionclc en duur isolooplegnieke om almost'criese N-binding ic bepaal, met mekaar te vergelyk
Summary
Sojabonc is die wcrcid sc bclangrikslc oliesaad cn die gcniiddcldc op b rcn gs w ord op [1,9] ton ha ' bcraam .' Die gem iddelde protei'en- en olie-inhoud van sojaboonsaad is 40% cn 21% respckticweiik.^ hi die VSA hel die nasionale opbrengs gcleidelik van [1,6] ton ha'' in I960 tot [2,2] ton ha'' in 1982 gestyg.’ SuidAfrika sc gem iddelde sojaboonopbrcngs in 1990-95 was [1,24] ton ha'' en die gemiddelde protcieninhoud vir 1993/94 slegs 34,5%.'* O pbrcngste tot so hoog as [8,5] ton ha ' onder ekspcrinicnlcle toesiande toon dat die gencticse polcnsiaal ver bo die h u idig eproduk sie v la k k e le.'-'^ O m in ’n vryc m ark m cc te ding cn in Suid-Al'rika sc tocnem cnde bekostigbare proteienbehoefles te voorsien, bchoort daar mecr op die lac opbrengs en protcieninhoud van sojaboongraan gcfokus tc word. SuidAfrika sc gem iddelde sojaboonopbrcngs in 1990-95 was [1,24] ton ha'' en die gemiddelde protcieninhoud vir 1993/94 slegs 34,5%.'* O pbrcngste tot so hoog as [8,5] ton ha ' onder ekspcrinicnlcle toesiande toon dat die gencticse polcnsiaal ver bo die h u idig eproduk sie v la k k e le.'-'^ O m in ’n vryc m ark m cc te ding cn in Suid-Al'rika sc tocnem cnde bekostigbare proteienbehoefles te voorsien, bchoort daar mecr op die lac opbrengs en protcieninhoud van sojaboongraan gcfokus tc word. ’n Polproel'is uitgevoer om; (1) die die aanpasbaarhcid van .sekcre simbioliesc pare (kullivar-rhizobiumras-kombinasies) op opbrengs, N- en protcieninhoud van die saad te cvalucer en (2) die laerkostc konvcnsionclc en duur isolooplegnieke om almost'criese N-binding ic bepaal, met mekaar te vergelyk. Mel die konvcnsionclc Icgnick word die almosferiesgebonde N as die vcrskil tussen N-opnam e dcur nodulercndc (benut almosrcriese en grond N) en nie-nodulcrcndc sojabonc of ’n ander verw ysingsplant (bcnut net grond N) bepaal. Die isotooplcgnick bchels die vcrryking van grond N met die spoo rder ' “^N sodat tussen a tm o sf c r ic sc c n g ro n d -N - opnan ic d c u r die plante ondcrskei kan word
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