Department of Soil Science and Agronomy, University of Hawaii, Honolulu, Hawaii (U. S. A.)
Greenhouse experiments with Sudan grass (S. sudanense), using two highly weathered Hawaiian soils, viz., a hydrol humic latosol (Akaka) and a ferruginous latosol (Puhi), with or without prolonged air-drying showed that air-drying alone did not improve the produc ivity of these soils, and liming in some form was found to be essential for calcium nutrition and plant growth. Application of 80 quintals per hectare was generally found sufficient and basic slag (TVA) significantly superior to ground coral stone. Air-drying of the Akaka soil decreased phosphate fixation to some extent.
Productivity of soil, liming, air-dryirjg
