تأثير الكبريت الزراعي و سماد السوبر فوسفات المركز في جاهزية الفسفور و تركيزه في أوراق محصول الذرة البيضاء (Sorghum bicolor L.)‎ خلال مراحل نموه المختلفة

Abstract EN

Field experiment was conducted during spring of 2013 by using factorial experiment design to study the effect of six levels of agricultural sulfur(95%S)( 0,2,4,6,8, and 10)tons S ha-1 soil and two levels of concentrated super phosphate fertilizer(20.21%P) ( 0 and 130)Kg P ha-1 soil on soil available phosphate and its concentration in leaves of sorghum crops NK8831 during forest, flowering and maturity periods of crop in field of Agriculture College/Univ.

of Basrah in silty loam soil .

The results showed high significant effect of agricultural sulfur on soil available phosphate and the level 6 ton S ha-1 soil gave the highest means of available phosphate to reached (56.38,48.64 and 35.30)mg P kg-1 soil respectively ,and the same treatment gave the highest concentration of phosphate in leaves to reach to (2.85,3.28 and 2.44) gm.

P kg-1 dry matter for forest, flowering and maturity respectively .The treatment fertilized with phosphate was given the highest concentration of available phosphate in soil (61.56,57.35,and 36.06)mg P Kg-1 soil with significant differences with control treatment(2.14,2.69,and 0.811)gm.

P Kg-1 dry matter respectively.

Combination treatment between agricultural sulfur and phosphate had significant effect on available phosphate and its concentration in leaves for all growth periods .The treatment fertilized with phosphate and 6 ton S ha-1 soil gave the highest level of available phosphate(70.65,64.67 and 41.55) mg P kg-1 soil and highest concentration in leaves(3.69,4.13, and 0.093)gm.

P kg-1 dry matter .

Concentration of phosphate in leaves was as follows: flowering> forest >maturity .