02041naa a2200325 a 450000100080000000500110000800800410001910000200006024500730008026000090015352008860016265000120104865000160106065000230107665000200109965000150111965000100113465000100114465000110115465000210116565000110118665300100119765300190120770000210122670000240124770000260127170000200129770000210131777303770133814886002018-05-30       2001    bl uuuu     u00u1 u    #d1 aALVES, V. M. C.  aMechanisms of phosphorus efficiency in maize.h[electronic resource]  c2001  aAn experiment was conducted on 12 maize hybrids to study the processes involved in screening for P efficiency in nutrient solutions. Four P concentrations (0.3, 0.9, 2.7 and 5.4 mg/litre) were applied to the nutrient solution 20 days after transplanting. In related experiments, the effect of P stress on the morphological and physiological root characteristics were studied. The seed P level and the total dry matter and shoot dry matter were significantly and positively correlated at 0.3, 0.9 and 2.7 mg P/litre. The best treatment to evaluate changes in total root length under P stress was that of 6 days of P omission which significantly increased the root length of 3 of the P efficient hybrids. The omission of P in nutrient solution significantly increased the maximum rate of P absorption of 6 hybrids after 3 days of omission and in 5 genotypes after 6 days of omission.  ahybrids  ahydroponics  anutrient solutions  anutrient uptake  aphosphorus  aroots  aseeds  ashoots  asoilless culture  aStress  aMaize  aMineral uptake1 aPARENTONI, S. N.1 aVASCONCELLOS, C. A.1 aBAHIA FILHO, A. F. C.1 aPITTA, G. V. E.1 aSCHAFFERT, R. E.  tIn: HORST, W.J.; SCHENK, M.K.; BURKERT, A.; CLAASSEN, N.; FLESSA, H.; FROMMER, W.B.; GOLDBACH, H.; OLFS, H.-W.; ROMHELD, V.; SATTELMACHER, B.; SCHMIDHALTER, U.; SCHUBERT, S.; WIREN, N.V.; WITTENMAYER, L. (Ed.). Plant nutrition; food security and sustainability of agro-ecosystems through basic and applied research. Dordrecht: Kluwer Academic Publishers, 2001. p. 566-567.