IMPROVING PHOSPHORUS USE EFFICIENCY WITH CARBOND® P AND DICARBOXYLIC ACID POLYMER (AVAIL®) FERTILIZER ADDITIVES

摘要: Improving phosphorus (P) use efficiency (PUE) is desirable but difficult due to poor P solubility in soils. Two relatively new fertilizer additives possibly increase PUE by increasing solubility. A dicarboxylic acid copolymer (AVAIL ® ) increases sequestering interfering cations. An organic based (Carbond P; 7-24-0) through complexation of P. The mode action both thought be related minimization precipitates soil. Field trials on potatoes with products have shown significant results. AVAIL trial: Monoammonium phosphate (MAP; 11-52-0) at 67 kg P2O5 ha -1 was applied or without addition and compared an untreated check five potato field sites. MAP+AVAIL resulted US No. 1 total yield two three sites, respectively. Generally, the other sites showed similar trends. However, a decrease yields one site, P-induced micronutrient deficiency. Petiole concentration MAP+AVAIL-treated plants significantly greater than treatments mid late season sampling dates all Carbond trials: replicated strip trial performed commercial 2009 Ignite (3-12-12) in-furrow planting strips. plant canopy closed 3-5 days earlier calcareous areas, tuber numbers were increased 13-28%, 61 153 hundredweight per acre application. Strip Idaho fields 2010 positive results for over ammonium polyphosphate (APP; 10-34-0) MAP. MAP broadcast 200 lb incorporated tillage. Both APP concentrated band 2-4 inches side seed piece 30 50 gallons P, low rate had greatest treatments; yielded 52, 51, 57 more 1, marketable, yields, APP. These are those observed crops greenhouse maximum being reached lower rates when supplied as enhanced products, Avail, seem effectively potential medium testing soils, especially reduced if nutrients not out balance.