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Fluid Journal : Fall 2016
2 The Fluid Journal Fall 2016 With differing nutrient placement. The Fluid Journal • Official Journal of the Fluid Fertilizer Foundation • Fall 2016 • Vol. 23, No. 4, Issue #94 The trials were conducted at two locations during 2015: theTidewater Agricultural Research and Extension Center (TAREC) located in Holland, Virginia, and the North Carolina Department of Agriculture and Consumer Services Peanut Belt Research Station located in Lewiston, North Carolina. The soil type at the TAREC location was a Eunola loamy sand (fine-loamy, siliceous, semi-active, thermic Aquie Hapludults). The soil type at Lewiston was a combination of Lynchburg and Goldsboro sandy loams (Fine-loamy, siliceous, semi- active , thermic Aeric Paleaquult and Fine-loamy, siliceous, sub-active thermic Aquic Paleudult). Soil samples were taken from both locations to a total depth of 12 inches (30 cm) and split into depths of 0-3, 3-6, and 9-12 inches. The Mehlich 1 soil test levels for each location can be found in Table 1. The base (100%) pre-plant phosphorus and potassium fertilizer rates were 40 lbs. P205/A and 40 lbs. K2O /A and based on Mehlich I soil test levels. All other agronomic practices were conducted according to Virginia extension recommendations. Treatment application, and harvest dates can be found in Table 2. Experimental design The study was conducted using four row plots measuring 12 feet wide by 35 feet long at both locations. Each treatment was replicated four times in a randomized complete block design. The cotton variety grown was Phytogen 499 WRF, an early to mid-maturing variety with a ▼ DOWNLOAD Summary: Responses to P and K during the study were limited as sites chosen were based on medium to high soil test P and K levels. Overall, the study was valuable in evaluating the performance and placement of P and K fluid sources on cotton growth and performance in the upper southeast coastal plain. high yield potential. Thirteen treatments evaluated placement of phosphorus (P) and potassium (K) fluid fertilizers (Table 3). Treatment 1 was an unfertilized P and K control, however at TAREC unfertilized plots did not receive nitrogen (N) or sulfur (S), while theunfertilized check at Lewiston received 80 lbs. N per acre in a side-dress application. Two agronomic control treatments were implemented to stimulate the current nutrient management systems in Virginia: 1) all of the required P and K broadcast prior to planting, and 2) 100 lbs. starter material (10-34-0) per acre applied in a 2 X 2 band at planting with the remainder of the P and K broadcast prior to planting (Table 3). Treatments 4-9 evaluated the responses to P and K fluid fertilizer applied in the 2 x 2 band at planting and deep placement during strip-tillage at 50, 100, and 150% of the recommended rates based on soil tests. The remaining treatment combinations evaluated a series of combinations of the 2 x 2 band and deep placement, all totaling the 100% of the recommended P and K fertilization rates (Table 3). Treatment application Treatments were applied with a strip-tillage implement and dates for implementation can be found in Table 2. Fertilizer placement with strip tillage was accomplished with an apparatus depicted in Figure 1 and placement of fertilizer is detailed in Figure 2. To dispense fluid fertilizers at 6, 9, and 12 inches below the soil surface, holes drilled 90o to the direction of travel allowed the fluid fertilizer to exit each down spout and maximize contact with soil at the targeted depths. The 2 x 2 banded fertilizer was applied at planting using a double disk opener mounted on the toolbar of a two row Monosem planter. The application rate for the fluid P and K sources was controlled by a carbon dioxide pressurized system and the application rates were controlled using inline orifices Dr. W. Hunter Frame Improving Cotton Production Efficiency “Results were very consistent from year to year”