The influence of radioactive phosphate level on the absorption of phosphate by plants and on the determination of labile soil phosphate

Larsen, S.; Cooke, I. J.

doi:10.1007/bf01343768

Cited by 10 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Experimental trees were similar in size, growth and fruit load and, as there was no advantage in expressing the results in terms of cpm mg-l P in order to allow for differences in the total uptake of P by different trees, this was presumably small. 3aP can inhibit ion uptake (Larsen & Cooke, 1961) but any inhibition would be the same at each placement site and, in this experiment where uptake gave samples of high activity for counting, this factor was also clearly unimportant. Variation in the amount of 32P in different shoot tip samples on any individual tree was, however, considerable and this was, undoubtedly, the largest source of error in these experiments.…”

Section: Discussionmentioning

confidence: 69%

Tracer studies with ³²P on the distribution of functional roots of Arabica coffee in Kenya

Huxley

Patel

Kabaara

et al. 1974

Annals of Applied Biology

View full text Add to dashboard Cite

S U M M A R YSeven experiments were done over a period of 21 months at Ruiru, Kenya, using 4 mCi/tree of 32P tracer to study the distribution of functional roots of mature Arabica coffee trees. Tracer was placed at sixteen equally spaced sites around individual trees at one of five depths (to 180 cm) and three distances (to 135 cm = mid-row). Thereafter, samples of three-leaf shoot tips were collected at 14-day intervals for up to seven occasions and the radioactivity assessed after drying and ashing.There was negligible activity at any time at 180 cm depth but at other depths, and at all three distances, the relative level of activity changed markedly with season. After prolonged drought relatively high root activity was found at mid-depth, near to the trunk; after the soil was re-wetted by rain most root activity occurred in the topsoil at the quarter-row distance ; after the soil profile had been wet for some time there was a more general distribution of functional roots. Some departures from this general scheme are discussed as are practical implications and the need for further investigations.

show abstract

Section: Discussionmentioning

confidence: 69%

Tracer studies with ³²P on the distribution of functional roots of Arabica coffee in Kenya

Huxley

Patel

Kabaara

et al. 1974

Annals of Applied Biology

View full text Add to dashboard Cite

show abstract

“…The quantity of phosphate which remained in a labile form in the soil (the L-value) was measured by an isotopic dilution technique (Larsen and Cooke, 1961;Larsen and Sutton, 1963). The basic procedure was to mix a quantity of radioactive hos hate with the soil and then replicates of each treatment.…”

Section: Measurement Of Labile Phosphatementioning

confidence: 99%

The Rate of Immobilization of Applied Phosphate in Relation to Soil Properties

Larsen¹,

Gunary²,

Sutton³

1965

Journal of Soil Science

Self Cite

View full text Add to dashboard Cite

The fate of superphosphate applied at 500 and 1,000 Ib PzO, per acre in a field experiment with twenty-four sites was followed by measuring changes in the L-value over 5 years. The L-value decreased exponentially at a rate that was expressed as the time in years for half the applied phosphate to become non-labile (the half-life). The two fertilizer rates gave similar values in most of the experiments and half-life values were satisfactorily measured for nineteen soils ; the values ranged from I to 56 years.Some relationship between half-life values and a number of soil properties was sought. The only significant correlation was with the hydrogen-ion concentration, from which it is suggested that the decrease in labile phosphate could be the result of the formation of a crystalline basic calcium phosphate at a rate that increases with soil pH.

show abstract

“…Assim, a maioria dos autores utilizaram vasos variando de 1 a 2 kg de solo (RUSSELL; RUSSELL; MARAIS, 1957;COOKE, 1961;VOSE, 1980;HOCKING et al, 1997;. Entretanto, Salcedo;…”

Section: Uso De Técnicas Isotópicas (Valor L)unclassified

Efeito do volume de terra no desenvolvimento das plantas de feijão e milho, na absorção do fósforo e no valor L (³²P)

Méndes¹

View full text Add to dashboard Cite

show abstract

The influence of radioactive phosphate level on the absorption of phosphate by plants and on the determination of labile soil phosphate

Cited by 10 publications

References 7 publications

Tracer studies with ³²P on the distribution of functional roots of Arabica coffee in Kenya

Tracer studies with ³²P on the distribution of functional roots of Arabica coffee in Kenya

The Rate of Immobilization of Applied Phosphate in Relation to Soil Properties

Efeito do volume de terra no desenvolvimento das plantas de feijão e milho, na absorção do fósforo e no valor L (³²P)

Contact Info

Product

Resources

About

The influence of radioactive phosphate level on the absorption of phosphate by plants and on the determination of labile soil phosphate

Cited by 10 publications

References 7 publications

Tracer studies with 32P on the distribution of functional roots of Arabica coffee in Kenya

Tracer studies with 32P on the distribution of functional roots of Arabica coffee in Kenya

The Rate of Immobilization of Applied Phosphate in Relation to Soil Properties

Efeito do volume de terra no desenvolvimento das plantas de feijão e milho, na absorção do fósforo e no valor L (³²P)

Contact Info

Product

Resources

About

Tracer studies with ³²P on the distribution of functional roots of Arabica coffee in Kenya

Tracer studies with ³²P on the distribution of functional roots of Arabica coffee in Kenya