ISSN:
1573-0867
Schlagwort(e):
allophanic soil
;
biosuper
;
low grade phosphate rock
;
marine phosphorite nodule
;
phosphate rock/sulphur granule
;
ryegrass
;
Thiobacillus spp
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
Notizen:
Abstract A pot trial was conducted for 10 months to evaluate the fertilizer value of two low grade phosphate rocks applied either as biosuper (phosphate rock/sulphur granules, PR/S*) or as untreated granulated rocks. The phosphate rocks were Chatham Rise nodules (CR), a marine deposit containing calcium phosphate and calcium carbonate, and the ‘C’ grade ore from Christmas Island (CC) containing predominantly aluminiumiron phosphate and free oxides of iron and aluminium. Perennial ryegrass was grown as the test crop in a highly phosphate retentive allophanic soil, limed to pH 6.2. Single superphosphate was used as the standard fertilizer. Phosphate uptake and dry matter yields showed that biosuper prepared from CR was agronomically as effective as superphosphate whereas that prepared from CC was less effective. At the highest rate of application CR increased the yield of ryegrass by 80% over that of control but granulating it with sulphur increased the yield by 143%. The corresponding values for CC and CC/S were 39% and 50%. The time lags from the addition of CR/S and CC/S to apparent maximum phosphate availability were less than 18 and 49 days respectively. Olen bicarbonate extractable phosphate of soils increased by 100% and 33% respectively when CR and CC were added as biosuper in comparison with addition as phosphate rock granules. Liming the soil to raise its pH from 5.1 to 6.2 lowered the quantity of superphosphate needed to reach 90% of maximum yield by 23%.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01834813
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