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- W2070166102 abstract "Abstract Trials on a Kokotau silt loam showed a 20% response in pasture dry matter yield to Ibex phosphate and a 4.5% response to gypsum over a 6-year period. In a comparison of forms of phosphatic fertilisers, yield, P concentration, and P uptake data placed the fertilisers in the following order of decreasing efficiency: Thermophos, superphosphate, Calcined“C”-grade Christmas Island rock phosphate (CCIP)-superphosphate (1: 3), CCIP, Gafsa rock phosphate, Nauru rock phosphate. The trial design did not permit an accurate quantitative evaluation of relative effectiveness. Yields over the 6-year period were similar whether the fertilisers were applied annually or at 3 times the annual rate every 3 years. There was evidence that CCIP and Gafsa phosphates improved relative to superphosphate with time. Annual applications of the manufactured fertilisers increased soil Al-P and Fe-P fractions but changed occluded-P or Ca-P little. In contrast Ca-P accumulated and Al-P and Fe-P declined greatly in soils receiving the Nauru and Gafsa treatments. Triennial applications of the manufactured fertilisers increased Al-P greatly in the years after application, with declining values in the intermediate years. Fe-P, occluded-P, and Ca-P tended to increase with time for these treatments. For the rock phosphates, Al-P and Fe-P declined with time, occluded-P tended to increase, and Ca-P increased in the year immediately after application, with decreases in the intermediate years. Available phosphate by the Bray No. 1 and Olsen methods gave patterns similar to those of Al-P. Available phosphate increased greatly immediately after triennial applications, but decreased to the level of the annual applications after 3 years." @default.
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- W2070166102 date "1980-01-01" @default.
- W2070166102 modified "2023-09-24" @default.
- W2070166102 title "II On a Kokotau silt loam" @default.
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- W2070166102 doi "https://doi.org/10.1080/00288233.1980.10417845" @default.
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