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Corn and Soybean Response To Phosphorus Placement Under Minimum Tillage System.

Poster Number 2206

Tuesday, November 5, 2013
Tampa Convention Center, East Hall, Third Floor

Cristie L Edwards, Dorivar A. Ruiz Diaz and David B. Mengel, Kansas State University, Manhattan, KS
Producers often question the need for better fertilizer placement methods in reduced tillage systems.  The objective of this study was to evaluate the effects of different placements and rates of phosphorus fertilizers in corn (Zea mays) and soybean (Glycine max).  The study was established at 3 locations in the spring of 2005 (8 years).  This paper focuses on one irrigated location.  Fertilizer placements included: starter, broadcast, deep band, and various combinations of starter with broadcast or starter with deep band.  Total fertilizer rates included: 0, 22, 45, and 90 kg P2O5 ha-1.  The experimental design was randomized complete block with four replications.  Corn early growth biomass was evaluated at the V6 growth stage, including whole plant tissue phosphorus concentrations.  Corn ear leaf tissue samples were collected at the VT-R1 growth stage and analyzed for phosphorus concentration.  Soybean uppermost fully open trifoliate tissue were also collected at the R1-R2 growth stage and analyzed for phosphorus concentration.  Corn grain yield and soybean seed yield were evaluated at the end of the growing season.  Results showed significant differences in corn early growth, early season P concentration and uptake, ear leaf P concentration, soybean leaf P concentration, as well as corn and soybean yield response to phosphorus fertilization.  Differences in corn early growth, P uptake, ear leaf P concentration, and soybean tissue P concentration were also significantly affected by fertilizer placement.
See more from this Division: SSSA Division: Soil Fertility & Plant Nutrition
See more from this Session: Soil Fertility and Plant Nutrition Division and Nutrient Management and Soil and Plant Analysis Division Graduate Student Poster Competition (PhD degree)

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