Investigation of accumulation and phosphorus removal in soil
2005
Khoogar, Zahra | Amin Pour, Javad | Zarea, Nader | Nasrolahi, Khandan | Jowkar, Ladan
In order to study the trend of accumulation or phosphorous removal from soil, this investigation was carried out between1991 till 2002. The design of field experiment was as permanent plots in four fields with wheat, sugar beet, corn and fallow rotation. This experiment was located in Zarghan soils, having relatively heavy texture, without salinity problem, soil acidity was 7.7, the content of organic carbon was low to moderate, availabe p and K were 10 and 350 mgkg-1 respectively. Treatments were 0, 45,90,135 and 180 kg ha-1 P2O5 (P0, P1, P2, P3 and P4) with four replications, the randomized complete blocks design was used in this experiment.Result of this experiment showed that in P0, which no P fertilizer received during the experiment, soil available P decreased 0.5-0.8 mgkg-1 yearly. P1, P2, P3 and P4, for all crops, caused a increment in soil available P as fallows: 0.5-1, 1.1-2.48, 3.1-3.8 and 4.7-5.7 mgkg-1 yearly. In general, results of eleven years experiment showed that if available soil P by Olsen,s method, be about l0 mgkg-1, regardless of kind of crops, application of 45 kgha-1 P2O5, we can reach to desired yield. Also during the experiment, P application had no significant effect on yield of all crops.
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