Phosphorus fertilizer form affects phosphorus loss to waterways: a paired catchment study

被引：25

作者：

McDowell, R. W. ^{[1
]}

Littlejohn, R. P. ^{[1
]}

Blennerhassett, J. D. ^{[2
]}

机构：

[1] AgResearch, Invermay Agr Ctr, Mosgiel, New Zealand

[2] Summit Quinphos NZ Ltd, Waikato Mail Ctr, Hamilton 3240, New Zealand

来源：

SOIL USE AND MANAGEMENT | 2010年 / 26卷 / 03期

关键词：

Reactive phosphate rock; stream; superphosphate; IRRIGATION RUNOFF; NITROGEN; FLOW;

D O I：

10.1111/j.1475-2743.2010.00289.x

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Two catchments were used to test the hypothesis that using reactive phosphate rock (RPR), a low water soluble fertilizer, instead of superphosphate, could decrease phosphorus (P) export in streams. The sheep-grazed catchments, each ca. 12 ha in size, received 20-25 kg P/ha either as RPR or superphosphate for 3 yr. Filterable (< 0.45 mu m) reactive P (FRP) and total P (TP) in stream samples were then compared against two subsequent years when both catchments received 20 kg P/ha as superphosphate. On average, during the 5-yr study, loads of FRP and TP in stream flow were low (110 g FRP/ha and 358 g TP/ha), typical of dry sheep-grazed hill country. However, FRP (58%) and TP (38%) in stream flow were significantly less when RPR was applied instead of superphosphate. Where appropriate climatic and soil conditions exist to maintain agronomic targets, RPR could be used to decrease P export in streams.

引用

页码：365 / 373

页数：9

共 36 条

[1]

[Anonymous], 2000, Australian and New Zealand Guidelines for Fresh and Marine Water Quality

[2]

[Anonymous], 1954, ESTIMATION AVAILABLE

[3] Phosphorus losses in irrigation runoff from fertilized pasture [J].