Fertilizer

A fertilizer and phosphate technology, applied in organic fertilizers, sewage/sludge fertilizers, fertilization devices, etc., can solve problems such as eutrophication of waterways and excessive growth of aquatic plants

Inactive Publication Date: 2006-04-05
MT ASPIRING GEOCHEMISTRY CONSULTANTS PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This runoff is a major economic loss for farmers and causes adverse environmental impacts that can lead to overgrowth of aquatic plants and ultimately eutrophication of waterways

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 - Phosphate Leaching from Pellets of Bauxsol and Superphosphate

[0044] Bauxsol was prepared as described here using a hydraulic press at an applied compression of 294Mpa TM Compressed pellets with a ratio of superphosphate fertilizer within a certain range. The resulting pellets had a diameter of about 1 cm, a thickness of about 3 mm and an average weight of 1 g. Accurately weigh several pellets into a flask and add 100 mL of Milli-Q water. The pellets and water were allowed to equilibrate over several days, and the water was periodically subsampled and analyzed for phosphorus in phosphate. The weight of the pellets is chosen to ensure that there is an excess of solids and that equilibrium can be achieved. After removing the water from each sample, the amount of water removed was replaced with fresh Milli-Q water, and the mixture was kept for a few more days before the next subsampling was performed. The test was run for 65 days to establish the phosphor...

Embodiment 2

[0046] Example 2 - Leaching of Phosphorus from Compositions of the Invention by Simulating Rainfall Events

[0047] The experiment simulated repeated rainfall events for different ratios of superphosphate and Bauxsol TM Effect of the prepared pellets. Several pellets with a total weight of 1 g were placed in a beaker and 100 mL of Milli-Q water was added. The pellets were stirred for 5 minutes and then held for 1 hour. The water was then stripped for analysis and replaced with fresh Milli-Q water and the process repeated. Given the surface area of ​​the beaker, the volume of water added, and the mass of phosphate present, each flush is roughly equivalent to 30 mm of rain falling on a well-drained soil fertilized with typical superphosphate fertilizer rates for 1 hour superior. The decanted liquid from each flush was analyzed for P and the cumulative loss of phosphorus was recorded as a proportion of the total available P. figure 2 The cumulative loss of phosphorus from t...

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Abstract

The present invention relates to fertiliser composition comprising from 95% to 1% by weight, based on the total weight of the fertiliser composition, of a phosphate fertiliser and from 5% to 99% by weight, based on the total weight of the fertiliser composition, of a phosphate binding substance selected from the group consisting of red mud that has been at least partially reacted with a material comprising at least one of calcium ions and magnesium ions, red mud that has been at least partially neutralised by addition of acid, red mud that has been at least partially neutralised by treatment with carbon dioxide, and red mud that has been at least partially neutralised by addition of at least one mineral containing at least one of calcium ions and magnesium ions, the phosphate binding substance having a reaction pH, when mixed with 5 times its weight of water, of less than 10.5. There are further provided methods for preparing the fertiliser and methods for fertilising soils.

Description

technical field [0001] The present invention relates to fertilizer compositions and methods of fertilizing soil. Background technique [0002] Phosphorus is an essential trace element for all flora and fauna, since it can be removed from agricultural fields faster than it can be replenished by natural climate and related processes, often requiring the application of artificial phosphoric acid Salt fertilizers to maintain agricultural productivity. The most commonly used phosphate fertilizer in broadacre agriculture is superphosphate. However, there are some problems associated with the application of phosphate fertilizers to pastures, the most serious of which involves the loss of slightly soluble phosphate fertilizers from fields into adjacent waterways. For many cropland areas, it has been shown that 40% to 60% of the phosphorus applied to pastures as superphosphate can be lost to nearby waterways during rainfall; the exact rate of loss varies with soil type, land slope,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B11/00C05B17/00
CPCC05B17/00C05F7/00C05D9/00
Inventor D·麦科恩齐M·W·克拉克F·G·戴维斯-麦科恩齐S·R·沃尔什
Owner MT ASPIRING GEOCHEMISTRY CONSULTANTS PTY LTD
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