SCARHOLE
Well-Known Member
Was @ the local co-op an grabbed a bit of this stuff for flowering.
lots of local farmes only use this shit.
11-54-0
sounds dam good..
lots of local farmes only use this shit.
11-54-0
sounds dam good..
IMPROVING THE EFFICIENCY OF PHOSPHORUS FERTILIZERS
W.B. Gordon
Summary
Phosphorus generally occurs in soils as the anions H2PO4- or HPO4-2, depending on the soil pH. These anions readily react with soil cations such as calcium, magnesium, iron, and aluminum to produce various phosphate compounds of limited water solubility. Crop recovery of applied P fertilizer can be quite low during the season of application. Specialty Fertilizer Products1 has developed and patented a family of dicarboxylic co-polymers that can be used as a coating on granular or mixed into liquid phosphate fertilizers. The registered trade name for the new product is AVAIL® The polymer is reported to sequester antagonistic cations out of the soil solution thus keeping P fertilizer in a more available form for plant uptake. To evaluate the effectiveness of the AVAIL product, experiments were conducted at the North Central Kansas Experiment Field during the period 2001-2004 using mono-ammonium phosphate (MAP, 11-52-0) coated with AVAIL on both corn and soybeans. In 2003-2005 AVAIL also was evaluated in liquid ammonium polyphosphate fertilizer (10-34-0) applied as a starter for corn production. Treatments in the corn experiment consisted of applying MAP at rates to give 20, 40 or 60 lb/a P2O5, either treated with AVAIL or untreated. A no P check plot was also included. The soybean experiment consisted of applying either treated or untreated MAP at rates to give 30 or 60 lb/a P2O5. A no P check was again included. The phosphate fertilizer was banded beside the row in both the corn and soybean experiments. The liquid starter experiment conducted from 2003-2005 consisted of a no starter check and a 30-30-5 treatment applied alone or with AVAIL at various concentrations. Fertilizer was placed two inches to the seed and 2 inches below the seed at planting. Soil test P values were in the medium category in all experiments. When averaged over years and P rates, the Avail treated MAP increased corn grain yield by 18 bu/a over the untreated MAP. Tissue P concentration was greater in the AVAIL treated plots than in untreated plots at both the 6 leaf stage and at mid-silk. When averaged over years and P rates, soybean yield was improved by 9 bu/a by the use of AVAIL treated P fertilizer. In 2003-2005, liquid starter fertilizer mixed with AVAIL increased corn grain yield by 9 bu/a over the untreated starter treatment. In 2005 and 2006 fall applications of AVAIL treated MAP were investigated for irrigated corn production. The experiment consisted of untreated MAP applied at the rates of 30, 60 and 90 lb P2O5/acre and AVAIL treated MAP applied in either the fall of the spring. Fall and spring applications of P fertilizer were equally effective. Fall applied AVAIL treated MAP preformed as well as spring applied and yielded 13 bu/acre greater than untreated MAP. Influencing reactions in the micro-environment around the fertilizer granule or droplet has proven to have a significant benefit to the availability of applied P fertilizer. The use of AVAIL increased P uptake and yield of corn and soybeans.
