تأثير طرق إضافة سماد السوبرفوسفات المركز على تفاعلاته و جاهزيته في ترب كلسية

الملخص EN

Studies were conducted to determine the effect of concentrated super phosphate fertilization placement on its reaction and phosphorous availability using two calcareous soils from south Iraq.

The phosphate fertilizer was added at four rates (0, 50, 100 & 200 kg P2O5.

ha -1) either mixed with soil, broad casting on the soil surface, subsurface application or dissolving with irrigation water.

Results indicated that the mixed method plays a significant role in increasing phosphate immobilization and retarding the formation of the more soluble phosphate compounds.

The method of fertilizer dissolving in water formed the less soluble compounds as compared with the broadcasting & mixed application.

However, the broadcasting method had the superiority over the others methods in keeping the phosphate availability for a long period in the both soil.