Abstract
This study was conducted to evaluation the role of the organic acids in the phosphorus fractions in silty clay loam texture. The laboratoryexperiment was conducted by adding the organic acids (Humic acid ,Citric acid ,Oxalic acid , Malic acid ,Acetic acid and Lactic acid )to the fertilized soil with conc. super phosphate fertilizer with 100 kg h-1 level with concentrations (0,15,30,45 and60)mg L-1,except Humic acid (500,1000,1500 and 2000) mg L-1.The soil was incubated at 30 C for 14,28,42,56 and 70 days period and the keep of field capacity about of incubation period during the daily weight.Amount of available ,mineral ,organic and total phosphorus after each incubated period were measured. The results showed that theaddition of organic acids of Humic acid ,Citric acid ,Oxalic acid and Malic acid were caused to increaseamount of available ,mineral ,organic and constant of total phosphorus in fertilized soil with conc. super phosphate fertilizer and increased its amount with increasing of organic acid concentration and better of Humic acid 2000mg L-1 significanton all the treatments .The results of the study that theaddition of organic acids were caused to increase amount of available and mineral phosphorus with increasing of incubation period and constant amount of total phosphorus and decreasing of organic phosphorus amount and available for only soil and only fertilizer treatment during increasing of incubation period .The organic acids can be arranged according to its ability toincrease the availabilityof the phosphorus as follow : Humic acid> Citric acid> Oxalic acid> Malic acid> Acetic acid>Lactic acid >control..
Highlights
Phosphorus is one of the necessarynutrient elementsof plant growth,especial in aridand semi-arid soils,amount of P in soil is depended on operations of weathering,quality and quantity of clay minerals,oxides, organic matter and calcium carbonate (1).Phosphorus can be found in the soil with multi forms as soluble, adsorption by clay minerals,CaCO3,Fe and Al Oxides,and sedimentor as calcium and Fe and Al phosphate,combined with organic matter,degree combined ofPwith colloids of organic and mineral soil were by physiochemical properties (2)
In soil are changed according to operation fertilization and soil management .The phosphate fertilization led to increase the available phosphorus from( 3 -20)mg kg-1 at addition 26 kg Ph-1(3).type and the level of addingphosphate fertilizer has an effect in its different forms and respond of production for its (5).Many of researchers (6)(7)(8)(9)were found on relation significant positive and negative between forms ofP and singular of growth to different crops depending on nature and environment of soils
D for 3rd author mineralization of organic phosphorus, decreasing of soil pH and attention ions of Ca++,Fe++,AL+++ (10) increasing of phosphorus availability in soil .this research was conducted to evaluationrole of Organic acids in the availability of the phosphorus in the silty clay loam texture
Summary
Phosphorus is one of the necessarynutrient elementsof plant growth ,especial in aridand semi-arid soils ,amount of P in soil is depended on operations of weathering ,quality and quantity of clay minerals ,oxides, organic matter and calcium carbonate (1).Phosphorus can be found in the soil with multi forms as soluble , adsorption by clay minerals,CaCO3,Fe and Al Oxides ,and sedimentor as calcium and Fe and Al phosphate ,combined with organic matter ,degree combined ofPwith colloids of organic and mineral soil were by physiochemical properties (2).
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