تلخیص
ditions. Plant residues with wide C/N ratio had negative effect on plant growth, while those with higher N content and narrow C/N ratio had a positive effect. Urea application did not affect the biomass yield of wheat probably because of the higher native content of mineral N in soil. Physiological attributes to biomass accumulation i.e., greenness and size of flag leaves and the photochemistry of photosystem II were not affected by different soil treatments. It was inferred that photosystem II was more relatively resilient to environmental perturbations including application of high C/N ratio plant residues that would have affected the availability of N to plants. The results also suggested that ample level of native soil N will mitigate the negative effect of plant residues that have the tendency of net immobilization of N
A. Lodhi, M.H. Sajjad,, A. Mahmood , F. Azam. (2006) Response of wheat (Triticum aestivum L.) to organic amendment and application of urea, The Journal Soil & Environment , Volume 25, Issue 2.
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