Phosphorus

About: Phosphorus is a research topic. Over the lifetime, 53120 publications have been published within this topic receiving 939731 citations. The topic is also known as: element 15 & P.

Determination of plant-available phosphorus by the iron hydroxide-impregnated filter paper (Pi) soil test

Abstract: The use of iron hydroxide-impregnated filter paper (Pᵢ) strips as a collector for phosphorus (P) in soil suspension offers a new approach to soil testing for plant-available P To correlate the Pᵢ test with crop response, four soils ranging in pH from 45 to 82 were incubated with three rates of P either as triple superphosphate (TSP) or central Florida phosphate rock (CFPR), and P was measured in these soils by the Pᵢ, Bray 1, Bray 2, double acid, Olsen, water, and resin extraction methods Two successive crops of maize (Zea mays L) were grown on these soils in greenhouse pots, and the dry matter yield and P uptake by maize were correlated with the soil test values The Pᵢ gave highly significant correlation with crop response in all four soils Across all soils, P source, rates of application and crops, Pᵢ gave the best correlation (0870) with P uptake and dry matter yield The next best correlation with dry matter yield was that of Olsen extractable P The Pᵢ test showed potential as a tool for prediction of P fertilizer requirements in soils

An Elemental Phosphorus Photocatalyst with a Record High Hydrogen Evolution Efficiency

Abstract: Semiconductive property of elementary substance is an interesting and attractive phenomenon. We obtain a breakthrough that fibrous phase red phosphorus, a recent discovered modification of red phosphorus by Ruck et al., can work as a semiconductor photocatalyst for visible-light-driven hydrogen (H2) evolution. Small sized fibrous phosphorus is obtained by 1) loading it on photoinactive SiO2 fibers or by 2) smashing it ultrasonically. They display the steady hydrogen evolution rates of 633 μmol h−1 g−1 and 684 μmol h−1 g−1, respectively. These values are much higher than previous amorphous P (0.6 μmol h−1 g−1) and Hittorf P (1.6 μmol h−1 g−1). Moreover, they are the highest records in the family of elemental photocatalysts to date. This discovery is helpful for further understanding the semiconductive property of elementary substance. It is also favorable for the development of elemental photocatalysts.

Increased Phosphorus Uptake by Wheat and Field Beans Inoculated with a Phosphorus-Solubilizing Penicillium bilaji Strain and with Vesicular-Arbuscular Mycorrhizal Fungi

Abstract: Greenhouse and field experiments were conducted to test the effect of a P-solubilizing isolate of Penicillium bilaji on the availability of Idaho rock phosphate (RP) in a calcareous soil. Under controlled greenhouse conditions, inoculation of soils with P. bilaji along with RP at 45 μg of P per g of soil resulted in plant dry matter production and P uptake by wheat (Triticum aestivum) and beans (Phaseolus vulgaris) that were not significantly different from the increases in dry matter production and P uptake caused by the addition of 15 μg of P per g of soil as triple superphosphate. Addition of RP alone had no effect on plant growth. Addition of vesicular-arbuscular mycorrhizal fungi was necessary for maximum effect in the sterilized soil in the greenhouse experiment. Under field conditions, a treatment consisting of RP (20 kg of P per ha of soil) plus P. bilaji plus straw resulted in wheat yields and P uptake equivalent to increases due to the addition of monoammonium phosphate added at an equivalent rate of P. RP added alone had no effect on wheat growth or P uptake. The results indicate that a biological system of RP solubilization can be used to increase the availability of RP added to calcareous soils.