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soil available p
Surface soil available P under tree canopies was 34-50% higher than the corresponding soil away from canopies.
      
Phosphorus-based manure or compost application resulted in similar grain yields to those for N-based treatments but had significantly less soil available P level after 4 yr of application.
      
Although differences were not statistically significant, soil available P concentration tended to increase at early stages of liming for both plantations.
      
However, at the same levels of soil available P and K, field-grown tithonia consistently produced lower leaf P and K concentrations than that grown in hedges.
      
We quantified inputs from the atmosphere, dissolved and particulate-bound losses, throughfall and litterfall fluxes, standing crop litter and soil available P pools.
      
This can be explained on the basis that a high forage yield of alfalfa requires more soil available P in the wet years than in the dry years.
      
Extractants for determining soil available P are useful in fertilizer recommendations when calibrated with actual yield responses.
      
The magnitude of build up of soil available P with NP and APP's were similar and higher than DAP or TSP.
      
Grain yield of cereals, P content of grain, pasture yield, and bicarbonate-soluble P extracted from the soil (available P) were used to estimate fertilizer effectiveness values.
      
Application of organic residue had positive effects on the soil available P status at varying degrees.
      
From the incubation study, it was found that although the local low to medium grade RPs were inferior to the reactive NCPR in increasing soil available P levels, they have the potential to improve soil chemical properties.
      
Soil available P significantly increased when mineral fertilizer andorganic mulch were combined.
      
Superphosphate increased soil available P and raised levels of P in foliage.
      
In low P soils AM fungal colonization significantly increased plant P uptake and decreased soil available P and total dissolved P in leachates.
      
Soil available P and exchangeable K contents were significantly higher in the rainy season than in the dry season, however, for the other soil properties, not substantially affected by season.
      
Soil available P could not be satisfactorily indicated, even across sites with equal moisture and shading conditions.
      
Soil available P and water extractable K were unaffected by manure type or bedding.
      
 

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