Effect of soil liming on the utilization of phosphatic fertilizers by sunflower plants [Egypt]
1988
Baghdady, N.H. (Tanta Univ., Kafr El-Sheikh (Egypt). Faculty of Agriculture) | Rabie, A.A. | Ali, R.A.
A pot experiment was carried out to evaluate P-fertilizers utilization by sunflower Plants grown in an acid soil treated with different levels of CaC03, (0, 10, 20 and 30% w/w). The P-fertilizers under investigation were Monocalciumphosphate (MCP); Ammonium polyphosphate (NH4-p.p.), Potassium polyphosphate (K=p.p.) and Phytic acid. Sunflower plants grown in the unlimed soil showed increases in dry weight depending on the type of fertilizer. The efficiency of fertilizers in increasing plant dry weight followed the order: MCP K-p.p. NH4-p.p. phytic acid. In the soil treated with CaC03, applications of K-p.p. or NH4-p.p. gave higher dry weight than MCP and phytic acid. Moreover, P-applications increased both P-uptake and P-content in the plants in presence or absence of CaC03. However, P-utilization by the plants, from any fertilizer, decreased with the increase of CaC03-additions. Phosphorus from k-p.p. fertilizer was highly utilized by the plants relative to the other three fertilizers at any level of CaC03-additions. Highly significant correlations were obtained between soil-P extracted by NaHC03 or CAL and both P-uptake by plants.
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