Abstract
Following the report “Studies on the Available Use of Pan-breaker” Part VIII, this is the report on the results of investigation carried out in 1962, the fourth year after pan-breaking treatment.
On the treated plots, the lowest penetrative resistance of the subsoil was 5-20kg at the depth of 50-60cm, showing that the passage trace of chisels has been existed for four years. But, it was found that soil compaction caused by tractor and other equipments had evidently reduced the lasting effects of pan breaking.
Porosity and penetrative resistance of the untreated subsoil were 57-58% and 30-35kg, respectively. These data were obtained both in May and November.
Top growth and root yields of beet crop were 0.5 ton per 10a higher on the treated plots than that on the untreated plots.
