Annual Bloom-time Phosphorus Fertigation Affects Soil Phosphorus, Apple Tree Phosphorus Nutrition, Yield, and Fruit Quality

Autoclaving soil samples affects algal-available phosphorus.

Unwanted microbial interference in samples used for biological assays of P availability has routinely been eliminated by autoclaving samples before inoculation with algae. Twenty-three soils were selected to evaluate the relationship between algal growth in P-deficient solutions containing small quantities of soil and the level of P determined by a variety of tests used to evaluate P availabili...

Phosphorus in Pig Nutrition

In order to reduce P excreted by pigs, P dietary supply should be better adjusted to the requirements and strategies to improve P availability should be implemented. The use of a feeding system relying on P apparent digestibility is recommended. This allows the reduction of safety margins when formulating pig diets, resulting in a decrease in P excretion. Low digestibility of P in feed ingredie...

Soil test phosphorus and cumulative phosphorus budgets in fertilized grassland

We analyzed the linearity of relationships between soil test P (STP) and cumulative phosphorus (P) budget using data from six long-term fertilized grassland sites in four countries: France (Ercé and Gramond), Switzerland (Les Verrières), Canada (Lévis), and Finland (Maaninka and Siikajoki). STP was determined according to existing national guidelines. A linear-plateau model was used to determin...

Phosphorus Nutrition of Ruminants

Most Australian soils are derived from parent material which is low in phosphorus. Soils of low phosphorus status support early maturing, grass dominant pastures with a short summer growth period and hence lengthy period of senescence. Phosphorus in these grasses may be as low as 0.02 g P/100 g OM during senescence (Robinson and Sageman 1967) and may only reach 0.15 g.P/lOO g OM during active g...

Understanding Soil Phosphorus An Overview of Phosphorus, Water Quality, and Agricultural Management Practices