02063naa a2200205 a 450000100080000000500110000800800410001910000220006024501310008226000090021350001740022252012220039665000160161865000320163465300320166665300270169870000220172570000160174777300940176311078412019-06-14       1981    bl uuuu     u00u1 u    #d1 aPURCINO, H. M. A.  aSoil fertility effects governing growth and nodule parameters at anthesis of two winged bean cultivars with a typic eutrustox.  c1981  aTítulo em português: Efeitos da fertilidade do solo no crescimento e parâmetros nodulares durante a antese em duas cultivares de feijão-alado com um typic eutrustox.  aWinged Bean cultivars,'fingeWB-21-8 and Siempre WB-12-11, were grown with complete fáctorial soil fertility experiments for P, K, Ca, Mg, and S combinationson a Typic Eutrustox (dark-red latosol) from Central Brazil. Nitrogenase (C2H2 reduction), growth, and associated nodule enzyme parameters and composition were determined at anthesis. Highly significant increases in nitrogenase activity levels resulted with applied P and K for both cultivars with significant increases for Ca additions. Growth,,nodulatíon and cytosol enzyme activity levels of GOT, GDH, GS and GOGAT all increased significantly with applied P, with the exception of GDH to applied K. a KG was increased to highly significant levels with K treatment. Cytosol composition was increased sígnificantly for each plant nutrient element contained in the treatment combinations. Highly signíficant inverse retroversion existed for K and Na. Na was negatively correlated with every parameter determined in these studies for both cultivars. Practical application of these data include the requirement for adequate available soil K and P for increased symbiotic N fixation and NH4'incorporation into amino acid components of the host legume symbionÊ  aNitrogenase  aPsophocarpus Tetragonolobus  asymbiotic nitrogen fixation  atropical edible legume1 aPURCINO, A. A. C.1 aLYND, J. Q.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 16, n. 5, p. 633-644, set./out. 1981