A note on the losses from a phosphate cycle under grazed pasture

Parfitt, R. L.

doi:10.1080/03015521.1980.10426261

Cited by 10 publications

(9 citation statements)

References 16 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…researchers have constructed mass-balance models of Efficient use of the applied SP in grazed pastures P and S for sheep farms (Karlovsky 1982; Saggar et depends on the extent of excretal transfer loss to stock al. 1990a, b) and dairy farms (Middleton & Smith camps, leaching losses, surface run-off, mineralization 1978;Parfitt 1980). A similar approach has been of soil organic P and organic S, and the immo-taken by for pastures in the bilization of the applied P and S (Blair et al 1977; sandy soils of south-eastern South Australia.…”

Section: Introductionmentioning

confidence: 99%

Nutrient cycling and losses based on a mass-balance model in grazed pastures receiving long-term superphosphate applications in New Zealand: 1. Phosphorus

Nguyen

Goh

1992

J. Agric. Sci.

View full text Add to dashboard Cite

S U M M A R YPhosphorus (P) cycling and losses in irrigated, sheep-grazed pastures receiving superphosphate (SP) applications for 35 years at annual rates of 0, 188 and 376 kg/ha were studied using a massbalance approach which accounted both for P inputs to and outputs from the soil-plant-animal system. Total recoveries of applied P in the soil-plant-animal systems in the 188 and 376 kg SP/ha treatments were 94 and 83 % respectively. Approximately 52-53 % of the applied P was recovered in the soil within the major plant rooting zone (0-300 mm soil depth). These data suggest that P leaching losses from SP fertilizer, plant litter, root residue and sheep faeces were unlikely to occur beyond the major plant rooting zone. However, the transfer of excretal P to stock camps and the transport of P from SP fertilizer, plant litter and sheep faeces via the irrigation water along the border from the top to the bottom of the irrigated border strip accounted for less than 6% of the applied P. Superphosphate applications resulted in the accumulation of both soil inorganic and organic P fractions to a depth of 225 mm. The accumulation of soil inorganic P was most pronounced when SP was applied annually at the rate of 376 kg/ha, which was in excess of pasture P requirements.

show abstract

Section: Introductionmentioning

confidence: 99%

Nutrient cycling and losses based on a mass-balance model in grazed pastures receiving long-term superphosphate applications in New Zealand: 1. Phosphorus

Nguyen

Goh

1992

J. Agric. Sci.

View full text Add to dashboard Cite

show abstract

“…In most temperate agricultural systems more than half of the applied fertilizer phosphorus (P) remains in the soil after the growing season immediately following application (Holford, 1977;Barrow, 1980;Parfitt, 1980). This fertilizer P remains as inorganic and organic forms of soil P. Thus water-soluble fertilizer P is converted to various sparingly soluble forms of soil inorganic P by reaction with soil mineral components (Sample et al, 1980).…”

Section: Introductionmentioning

confidence: 99%

Effects of long‐term phosphatic fertilizer applications on amounts and forms of phosphorus in soils under irrigated pasture in New Zealand

Condron

Goh

1989

Journal of Soil Science

114

View full text Add to dashboard Cite

In this study a detailed sequential fractionation scheme was used to examine the effects of long-term annual applications of phosphatic fertilizer on the amounts and forms of phosphorus (P) in soils under intensively grazed irrigated pasture over a 25 year period . Results showed that increases in soil inorganic and organic P occurred in response to continued P fertilizer addition, although inorganic P decreased with time following the cessation of P fertilizer inputs in the residual fertilizer and control treatments. The rate of organic P accumulation in soils decreased with time, while a marked decline in soil organic P in all treatments between 1971 and 1974was attributed to increased mineralization as a result of lime addition in 1972. Furthermore, changesin the forms of inorganic P which accumulated in the continually fertilized soils after 1971 were attributed to the combined effects of liming and changes in the chemical nature of applied fertilizer P.

show abstract

“…(1963) the phosphate content of the pasture and the soil test for phosphate, however, gradually decreased during the three years after topdressing, indicating that phosphate was being lost from the labile pool. Generally, Andisols in New Zealand require higher levels of phosphate fertilizer than other soils for the same level .of pasture productim, and this is consistent with an annual loss of phosphate by reaction with allophane (Parfitt, 1980). For the Tirau and Waihou Andisols the annual loss of effectiveness of phosphate is estimated to be 50% (Figs 2 and 3).…”

Section: G E N E R a L Discussionmentioning

confidence: 55%

Loss of availability of phosphate in New Zealand soils

Parfitt

Hume

Sparling

1989

Journal of Soil Science

Self Cite

View full text Add to dashboard Cite

Phosphate sorption was measured by the method of Barrow (1980) using a laboratory incubation procedure for up to 60 d on four soils which had different mineralogies but medium to high phosphate retention. All the soils had slow reactions where phosphate sorption continued, but at a decreasing rate, with time. The rate of decrease in the slow reactions was similar on all the soils. Phosphate became less available to plants during the slow reactions, and results of a pot trial with white clover showed that, on all the soils, phosphate incubated with the soils for 218 d was about 65% as effective as phosphate incubated for 10 d.When 700 mg P kg-' was added to allophanic soils (Andisols), about 100 mg kg-l was strongly adsorbed, about 200 mg kg-I became unavailable in about 200 days and the remainder was weakly adsorbed. A similar result was obtained on Waiarikiki soil (Inceptisol), which contained ferrihydrite and Al-humus as the predominant reactive species. On the Kerikeri soil (Oxisol) about 150 mg P kg-' became unavailable with time as a result of reactions with geothite, hematite and Al-humus.The phosphate uptake by the microbial biomass was similar to the uptake by the clover, and immobilization of phosphate in the biomass can contribute to the loss of availability of phosphate in soils.

show abstract

A note on the losses from a phosphate cycle under grazed pasture

Cited by 10 publications

References 16 publications

Nutrient cycling and losses based on a mass-balance model in grazed pastures receiving long-term superphosphate applications in New Zealand: 1. Phosphorus

Nutrient cycling and losses based on a mass-balance model in grazed pastures receiving long-term superphosphate applications in New Zealand: 1. Phosphorus

Effects of long‐term phosphatic fertilizer applications on amounts and forms of phosphorus in soils under irrigated pasture in New Zealand

Loss of availability of phosphate in New Zealand soils

Contact Info

Product

Resources

About