Effect of N fertilizer on the availability of phosphate rock for cassava grown in red soils
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Abstract
A study on the effect of N fertilizer in the forms of urea and ammonium sulfate on P availability of rock phosphate (RPs) from Kamphaeng Phet (KPRP) and Lampang (LPRP) sources comparing with triple superphosphate (TSP) fertilizer in cassava grown in Warin (Wn) and Yasothon (Yt) soil series was conducted. The KPRP contained 29.39% of total P2O5, which was higher than did LPRP (19.15%), but when dissolved acid they gave rather similar P2O5 content. The available P content increased with the range of 4.9-64.9 mg/kg detected after applying RPs for seven days, KPRP significantly gave greater content than did LPRP but still lower than TSP throughout 60-day incubation period, while N fertilization together with RPs application lowered soil P availability but significantly higher than the control. The application LPRP in Wn soil series significantly gave the highest aboveground biomass (1.52-1.63 t/rai), cassava tuber (5.84-5.94 t/rai), and starch yields (1.51-1.57 t/rai) but with no statistical difference from that applied with TSP. All of which gave the lowest amounts when used with urea while ammonium sulfate efficiently increased RPs solubility in Yt soil series, significantly giving the greatest cassava tuber and starch yields, and aboveground biomass of 1.63, 0.31, and 1.60 t/rai, respectively, when applied together with KPRP. However, fresh tuber yield was not statistical different from the applied with TSP (1.58 t/rai). In addition, the application of RPs significantly resulted in lower amounts of available P (22.7-40.9 mg/kg) remained in the soils than did the addition of TSP (60.3-61.8 mg/kg) but the content of total P was barely different from that obtained from the plots added with TSP (239-428 mg/kg). BrayII, NaOH, and MehlichIII for soil P content extraction showed the content extracted negatively correlated with cassava yield components; thus they were less suitable for the evaluation of soil P availability
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