Plant-Available Phosphorus in Highly Concentrated Fertilizer Bands: Effects of Soil Type, Phosphorus Form, and Coapplied Potassium.
J Agric Food Chem
; 68(29): 7571-7580, 2020 Jul 22.
Article
en En
| MEDLINE
| ID: mdl-32657588
ABSTRACT
Phosphorus (P) is increasingly being applied in concentrated bands to satisfy plant nutrient requirements. To quantify changes in plant-available P in the fertosphere of highly concentrated fertilizer bands, we conducted a soil-fertilizer incubation experiment using seven soil types, three highly water-soluble P sources [monocalcium phosphate (MCP), monoammonium phosphate (MAP), and diammonium phosphate (DAP)], and coapplication of potassium chloride (KCl). First, we found that soil properties were important in influencing P availability. For a calcareous soil, availability was generally low irrespective of treatment, presumably due to precipitation of the fertilizer as Ca-P minerals. For all six noncalcareous soils, fertosphere pH was critical in determining potential P availability, with decreasing pH values decreasing availability, presumably due to precipitation of Al- and Fe-P minerals. Second, given the importance of pH, we also found that the form of P supplied (MCP, MAP, or DAP) had a pronounced effect on P availability due to associated changes in fertosphere pH. Finally, we also found that the coapplication of K also decreased P availability in some soils. We conclude that the selection of the P source is of utmost importance when fertilizers are placed as highly concentrated bands and that soil properties also need to be considered.
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Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Fósforo
/
Potasio
/
Suelo
/
Triticum
/
Fertilizantes
Idioma:
En
Revista:
J Agric Food Chem
Año:
2020
Tipo del documento:
Article
País de afiliación:
Australia