EFFECT OF ORGANIC FERTILIZER, PHOSPHORUS SOURCES AND AMOUNTS OF IRRIGATION WATER IN P AVAILABLE IN SOIL

Abstract

Afield experiment  was conducted  in  Agriculture  College – University of Baghdad in the season  2012   to study  the  effect of addition  organic  fertilizer, phosphorous  sources  and amounts  of  irrigation  water in availableof phosphorus in the soilbyusing three levels of irrigation water amounts at rates 60 % , 80 % ,100 % of the total water requirement in the season amounting 675 mm and two levels of organic compost ( Humo-Bacter A)) are zero and 1.5 Mg.ha -1and three sources  of  phosphate fertilizer ( triple super phosphate TSP, di ammonium phosphate DAP, urea phosphate UP) at rate 100 kg.ha-1. The results showed  surpass  urea phosphate  significantly  on other  P sources with concentration reached 33.75 mg P. kg-1.soil. addition  of organic  fertilizer effected  significantly  in an increasing  P availability in soil  to  31.69  mg P. kg-1 .level of  W3(100% of total water  requirement) achieved high concentration among other levels reached  32.94 mg P. kg-1.soil.results indicated that the double and tri interactions W3M1,W3P3,M1P3,W3M1P3 achieved high p availability  in  soil reached to 38.02,38.8,40.8, 48.4 mg p.kg soil -1 ,respectively.