Evaluation of wheat phosphorus requirement under saline conditions.
2012
Hasheminejhad, Yousef | Karimi Zarchi, Mehdi | Soltani, vali | Gholami, Mahmood | Ghane, Fatemeh | Rousta, Mohammad Javad
To determine the level of soil P in which fertilizer application does not lead to yield increase, the critical level experiments should be established. To predict critical level of phosphorus under saline and non- saline conditions a factorial pot experiment with 14 levels of soil P, 2 levels of irrigation water salinity 2 and 10 dS/m and 3 levels of fertilizer adition equal to 0, 25 and 50 mg P from triple super phosphate source per Kg of soil was conducted in a completely randomized design with 3 replications for wheat (Bam variety). Fertilizer application method was soil application befor sowing. Irrigation water source was the saline water of Saduq salinity research station, blended with the tap water to achieve the desired salinity level. The experiment was replicated in 2 years and the grain yield was determined at the end of each season. Regarding the statistical comparision of results and analysis of critical level using Cate- Nelson and visual interpretation, there was not significant difference between the levels of fertilizers added, but it enhanced the yield generally. The critical level of phosphorus was determined to be about 14 and 14.6 mg/Kg in non- saline conditions of first and second year respectively and 13.5 mg/Kg in saline conditions of both years. For Cate- Nelson method the values were about 14.5 and 14 mg/Kg for non- saline conditions of first and second year respectively and 14 and 12 mg/Kg for saline conditions of first and second years respectively. Generally the critical level under saline conditions was lower than nonsaline conditions.
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