کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8487640 | 1552040 | 2015 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Management of soil phosphorus fertility determines the phosphorus budget of a temperate grazing system and is the key to improving phosphorus efficiency
ترجمه فارسی عنوان
مدیریت باروری فسفر خاک تعیین بودجه فسفر یک سیستم چراگاه معتدل است و کلید بهبود راندمان فسفر است
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کلمات کلیدی
بهره وری استفاده از فسفر، جذب فسفر، مازاد فسفر، باروری خاک،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم زراعت و اصلاح نباتات
چکیده انگلیسی
The phosphorus (P) efficiency of fertilised grazing systems on P deficient soils is often very low. P budgets (P input vs P output) were developed to examine P use in a long-term experiment in which grazing systems were managed with contrasting soil test P concentrations: (i) no P-fertiliser (P0; Olsen PÂ =Â 2-5Â mg/kg), (ii) near-optimum soil P fertility (P1; Olsen PÂ =Â 10-15Â mg/kg), (iii) supra-optimal P fertility (P2; Olsen PÂ =Â 20-25Â mg/kg), or (iv) with variable P fertility. Pastures were grazed with either 9 or 18 sheep/ha. P was exported as liveweight gain in sheep removed from the fields. Fertilised fields accumulated 89-93% of their P input over the whole P-budgeting period (1994-2006). However, this included P that was contributing to a “build up” in soil fertility (1994-2000). The efficiency of P fertiliser use was better demonstrated by P budgets during a soil P fertility “maintenance” phase (2001-2006) in which P inputs and soil test P concentrations of the grazing system treatments were relatively stable. When the amounts of P associated with the small changes in soil fertility were accounted for, the accumulation of P was 43-52Â kg P/ha (83-87% of P inputs) in P1 fields and 87Â kg P/ha (88% of P inputs) in P2 fields over the six-year period. Differences due to stocking rate were relatively small. Audits of the total P in sheep camp soil and field soil demonstrated that sheep camps were not a major sink for the P that was accumulating in the grazed fields. P was mainly accumulated in soil in the non-camp area of fields when they were fertilised and this was the major reason for low P-balance efficiency. It was concluded that the annual rate of P accumulation in fertilised soil (due mainly to P-sorption reactions) was higher when soil is being maintained at higher extractable-P concentrations. Consequently, strategies that can achieve equivalent pasture production with lower concentrations of extractable-P in the soil should reduce the amount of P fertiliser necessary for high production.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Agriculture, Ecosystems & Environment - Volume 212, 20 December 2015, Pages 263-277
Journal: Agriculture, Ecosystems & Environment - Volume 212, 20 December 2015, Pages 263-277
نویسندگان
Richard J. Simpson, Adam Stefanski, David J. Marshall, Andrew D. Moore, Alan E. Richardson,