iron is an essential nutrients in rice. accurate assessment of this element in paddy soils is very important. improving fertility management, accurate interpolation, being aware of spatial variability and patterns of distribution of micronutrients are the most important factors in soil management and accurate consumption of fertilizers. this study was done for investigating of available iron, d...

22. M., Ninomiya, Y. & Olsen, H. K. (198%) J. Hiol. Chem. 263.2324-2329 Yada, T., Suzuki. S., Kobayashi, K., Kobayashi, M., Hoshino, T., Horie. K. & Kimata, K. (1000) J. Hiol. Chem. 265,6092-6990 Gordon. M. K., Gerecke, L). R. & Olsen, H. K. (1 987) I’roc. Natl. Acad. Sci. LISA. 84. 6040-6044 Llublet, H. & van der Rest, M. (1987) J. Hiol. Chem. 262. 1772417727 Dublet, H., Oh, S., Sugrue, S. I)....

Soil microbes and phosphatase enzymes play a critical role in organic soil phosphorus (P) cycling. However, how long-term P inputs influence microbial transformations enzyme activity under grazed pastures remains unclear. We collected top-soil (0–75 mm) from pasture receiving contrasting (control, 188 kg ha−1 year−1 of single super phosphate [SSP], 376 SSP) for more than 65 years. Olsen P, biom...

In this study seven plant species were collected from the forest of Arasbaran located in the northwest of Iran. Sampling was conducted in May and August and roots were used for calculating vesicular arbuscular mycorrhizal colonization percentage during the same period. Fine roots were separated, washed and put in FAA solution as a fixative. Through the time, root colonization of all plant speci...

abstract agriculture is the largest consumer of water resources in iran. one of the best options for increasing the irrigation efficiency and better application of precipitation in arid and semi-arid areas is employing of superabsorbent polymers to soil. polymers can absorb rain and irrigation water, decrease deep percolation and increase water use efficiency. in order to investigate the effect...

Incubation experiment was conducted on four soil types in Nigeria using cattle dung (CD) at the rate of 2.5g/kg soil ( 5 t ha), Urea fertilizer at the rate of 0.1g/kg soil ( 200 kg ha ) and cattle dung (2.5g/kg soil) combined with Urea 0.05g/kg soil (100 kg ha) as treatments. The objective of the experiment was to compare the rate of OC, NH4 – N, NO3 – N and available P release on soils selecte...

The aim of this study was to determine the effect of mineral fertilization on the activity of alkaline and acid phosphatase and content of available phosphorus in soil under winter wheat cultivation. The fi rst factor of experiment was the fertilization with P, K, Mg, Ca and S in six levels: 1 (P, K, Mg, Ca and S), 2 (K, Mg, Ca and S), 3 (P, Mg, Ca and S), 4 (P, K, Ca and S), 5 (P, K, Mg, Ca), ...