Response of some tropical grasses to molybdenum application

The response to Mo application of Panicum maximum var. trichoglume cv. Gatton (panic), Cenchrus ciliaris cv. Biloela (buffel) and Setaria sphacelata cv. Nandi (setaria) was studied at three rates of NO3 supply in pots containing soil that was severely Mo deficient for tropical legumes. There were no growth responses of these grasses to Mo, except for a marginally significant effect in panic at the highest NO3 treatment at the first harvest. These results are compared with Mo responses of legume/grass mixtures in the field and published data showing large growth responses of some temperate grasses to Mo. Application of Mo had no effect on total N concentrations of grass tops but markedly decreased NO3-N concentrations in buffel. Setaria had a greater ability to take up Mo than the other grasses and this was associated with the lower NO3 levels in this species. Critical Mo concentrations for growth of all grasses were below 0.02 p.p.m.

[1]  P. Basuchaudhuri,et al.  Molybdenum nutrition of rice under low and high nitrogen level , 1977, Plant and Soil.

[2]  F. Smith,et al.  Derivation of diagnostic indices for assessing the sulphur status of Panicum maximum var. trichoglume , 1977 .

[3]  C. Johansen,et al.  The residual effect of molybdenum fertilizer on growth of tropical pasture legumes in a sub-tropical environment , 1977 .

[4]  K. Wells,et al.  Molybdenum Concentration of Certain Crop Species as Influenced by Previous Applications of Molybdenum Fertilizer1 , 1976 .

[5]  J. Lipsett.  A comparison of the responses by six grasses, rape and subterranean clover to application of molybdenum , 1975 .

[6]  A. Darwinkel.  Aspects of assimilation and accumulation of nitrate in some cultivated plants , 1975 .

[7]  R. Clárk,et al.  Differential Response of Two Maize Inbreds to Molybdenum Stress1 , 1974 .

[8]  E. Henzell,et al.  The relation between growth and leaf nitrogen concentration in Nandi setaria and some other tropical grasses , 1973 .

[9]  Keith H. Northcote,et al.  A factual key for the recognition of Australian soils , 1971 .

[10]  J. M. Bremner,et al.  Determination and Isotope-Ratio Analysis of Different Forms of Nitrogen in Soils: 3. Exchangeable Ammonium, Nitrate, and Nitrite by Extraction-Distillation Methods1 , 1966 .

[11]  Madison J. Wright,et al.  Nitrate Accumulation In Crops And Nitrate Poisoning In Animals , 1964 .

[12]  A. J. Anderson.  Molybdenum as a Fertilizer , 1956 .

[13]  C. Johnson,et al.  Determination of molybdenum in plant tissue. , 1954 .