Effect of inoculation with phosphate solubilizing actinomycete isolates on phosphorous uptake and growth of wheat grown in calcareous sandy soil

الملخص EN

Two pot experiments were conducted in this study during the period of 2015 to 2017.

The first pot experiment was conducted, during the winter, of 2015/2016 to test the effect of inoculation with nine actinomycete isolates on phosphorous uptake and growth of wheat (Triticum Sativa) plants in sandy calcareous soil and choose the best of two actinomycete isolates.

All actinomycete isolates caused significant increase (p = 0.05) in plant height and shoot fresh weight except for strain A3, but non-significant increase in root fresh weight.

It should be noticed that the isolates A4 and A10 induced the highest stimulative effects on growth parameters of wheat.

The second pot experiment was conducted in 2016/2017 to test the effect of inoculation with actinomycete isolates (the best stains A4 and A10) on P-uptake and growth of wheat plants grown in sandy calcareous soil under different chemical phosphorous levels (P1=25%, P2=50% and P3=100% from recommended doses).

The A4 actinomycete isolate showed higher promotive effects on plant height, root and shoot dry weights and P- uptake by the shoots than those shown by the A10 actinomycete isolate.

Inoculation with the A4 actinomycete isolate resulted in an increase in p- uptake by plant shoots up to 297.97 %, of the uninoculated control.

In other words, the best promotion effect from inoculation with A4 actinomycetes isolate was obtained at p- fertilization level 50 % of RDP.

These results indicate the importance of plant inoculation with phosphate solubilizing microbes, such as A4 actinomycete isolate to decrease the application of p-fertilizers in agriculture.