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Fluid Journal : Fluid Journal 1996-1998
3 Fluid Journal Fall 1997 Yield - bu/A 190 1991 No Starter Starter 175 160 145 130 115 100 85 G-4666 Sb1802 5750 Hybrid Figure 4. Starter and hybrid influence on corn yield. Data averaged across planting dates. Mascagni and Boquet, LSU, 1991. 3165 Rx947 Sb1876 Yield - bu/A No Starter Starter 1992 190 175 160 145 130 115 100 85 G-4666 Figure 5. Starter and hybrid influence on corn yield. Data averaged across planting dates. Mascagni and Boquet, LSU, 1992. Sb-1802 5750 Hybrid3165 Rx947 Sb1876 Yield - bu/A No Starter Starter 1993 190 175 160 145 130 115 100 85 G-4666 Figure 6. Starter and hybrid influence on corn yield. Data averaged across planting dates. Mascagni and Boquet, LSU, 1993. Sb-1802 5750 H ybrid3165 Rx947 Sb1876 was calibrated to apply 4 gal/A but only 3 gal/A was actually applied. This supplied N and P at a rate of 3.9 and 5.7 lbs/A, respectively, in 1991, and 5.2 and 7.6 lbs/A in 1992 and 1993. NF4NO3 was broadcast before planting or shortly after planting at a rate of 180 lbs/A. This probably minimized a yield response to the N component of the starter fertilizer. No other fertilizer was applied. Pesticides. Insecticide carbofuran was applied in a tank mix with the starter or applied alone in the check treatment. Weeds were controlled with labeled preemergent and postemergent herbicides, and with cultivation. Sampling. Soil P levels in the test area were considered high (130 to 150 ppm) each year, according to analyses conducted by the Louisiana State University Agronomy Department Soil Testing Laboratory. In each year, typical P-deficiency symptoms were noted on corn leaves in the check plots, indicating that P was the more important component. Plot design. Experimental design was a randomized complete block with a split-plot arrangement of treatments. Planting dates were assigned to main plots. Hybrid/starter combinations were split plots. There were six replications of the hybrid/starter treatments in 1991 and 1992, and four replications in 1993. Split plots consisted of four rows approximately 35 feet long, with 40 inches between rows. Grain yield was determined by combine harvesting two center rows of each plot when the hybrids within a planting date reached approximately 20 percent grain moisture. Dr. Mascagni is associate professor and Dr Boquet is professor at Louisiana State University Agricultural Center . !
Fluid Journal 1993-1995
Fluid Journal 1999-2001