امتصاص الأيونات الموجبة المعدنية في التربة المعاملة بمخلفات المجاري و أثرها في نمو الذرة الصفراء

الملخص EN

An investigation was carried out to study the effect of two levels of sewage sludge (20, 40 T/ h) with mineral and biofertilizers or with out them on soil chemical properties .

The experiment was conducted on corn (Zea mays L.),(Compound Research 106) in the Horticulture station in Hindya /Karbala Province , using CRBD with three replications.

Mineral fertilzer was added as recommended by 320 kgN/h ,100kg P2O5/h and 120Kg K2O/h while biofertilizer was added near the seeds after mixing it with small quantity of the soil by 2kg biofertilizer /h.

Soil samples were collected after harvest to do the required analysis .

Increasing the level of sewage sludge addition to 40 T/h caused a significant increase in electrical conductivity , reduction in soil pH from 7.61 to 7.47 and increase in organic matter content of the soil from 11.00 to 12.97 gm.kg-1 The total N and available P of post harvest soil increased while available K decreased with increased quantity of sewage sludge .

The available concentrations of heavy metals like Fe, Zn ,Mn ,Cu ,Pb of post harvest soil were increased while available Cd concentration was nill with increased quantity of sewage sludge .The concentrations of heavy metals were found below the phytotoxic level in all treatments.

Grain yield increased by 19% with addition of 20T/h of sewage sludge while increasing the sewage sludge level to 40 T/h increased the yield by 36% .The increasing in the yield was 44% when mineral fertilizer was added with 40T/h of sewage sludge to the soil.Maximum increase in the yield 52% was found in the treatment T10 (40T/h S.S @mineral+ biofertilizers).

This confirms that the corn had a good response to fertilizer additions .The shoot content of N,P,K, Fe, Zn, Mn and Cu increased with increasing the quantity of sewage sludge to 40T/h plus mineral and biofertilizers while the shoot content of Pb and Cd was nill and this is may be due to the neglectable available concentrations of these elements in sewage sludge and soil.