摘要：In calcareous soils, Fe availability is highlyrestricted. On the other hand, Fe metabolism isintimately related to S, N, and P ones, whilstintensive agronomic activity requires significant Sinputs. How these relationships are shaped in thecommonly used for lawns species Cynodondactylon, Pennisetum clandestinum, Festucaarundinacea, Festuca rubra, Lolium perenne, Poapratensis, Dichondra repens, and Trifolium repens,when they are grown in a medium-texturedcalcareous soil irrigated with slightly saline water?In this system, [Sorg] presented a wide range amongthe studied lawns, and two groups weredistinguished: one with [Sorg] above 70 ȝmol g-1DMand the other with [Sorg] below 50 ȝmol g-1DM. Allbinary combinations of N/Sorg, P/Sorg, SO42-/Sorg,Fe/Sorg ratios were in very strong linear relationships,along with N/Fe vs P/Fe ratios. Sorg/Fe ratiosuggested more acquisition of S relative to Fe, by thewarm season grasses. The relationship betweenSorg/Fe and SO42-/Sorg ratios suggested that Fe andSO42- were interconnected via the required contentof Sorg and the following scenario seems to besupported: P nutrition was adjusted to N nutrition;iron was adjusted to both of them, so that N/Fe wasin linear relationship to P/Fe. Sorg was adapted toboth N and Fe.
关键词：S; Fe; cold/warm season grasses; calcareous soil; nutrition
status index
