EVALUATION OF THE EFFECTS OF AGRI-SC AND AGRISPON ON CORN AT WATERLOO IOWA IN 1990

Transcription

1 EVALUATION OF THE EFFECTS OF AGRI-SC AND AGRISPON ON CORN AT WATERLOO IOWA IN 1990 Submitted to: Mr. Wally Leman, Four Star Ag Services P.O. Box 463, Bluffton, IN Tel: (800) Fax: (219) Submitted by: ACRES P.O. Box 249 Cedar Falls, Iowa Te1: (319) Fax: (319) ACRES Project Code: 90681A Summary Comments Objective The objective of this study was to evaluate the effect of Agri-SC and Agrispon on corn yield and yield components at Waterloo, Iowa in Materials and Methods A randomized complete block design with four replications was used in this study. Plots consisted of four rows 40 feet long with a 3-inch row spacing. On May 18 two soil samples were collected from the study area. and sent to A & L lab for soil characterization. Dual at 2 pts/a and Bladex at 2.4 lbs/a were broadcasted on May 24 and then incorporated. Six fertility programs were used in this study (Table 1). The combination of Agri-SC, Agrispon and two rates of nitrogen (40 and 120 lbs per acre) made up the six treatments. Agri-SC and Agrispon were applied separately to the appropriate plots on May 22 using a six-nozzle shielded boom mounted on a John Deere 317 lawn tractor. Agri-SC was applied at a rate of 4 lbs per acre whereas Agrispon was applied at a rate of 0.11 gal/acre (1 liter/hectare). Nitrogen was applied on May 24 to all plots at a rate of 40 lbs/a. In addition, treatments 5 and 6 received an additional 80 lbs/a of nitrogen on May 24. Pioneer 3475 corn was planted on May 31 using a six-row maxemerge planter at a planting rate of 30,200 seeds/acre. The application of Agrispon at silking was made on August 2 using a backpack sprayer with a six-nozzle boom. The application rate was 0.11 gal/acre (1 liter/hectare). Leaf area per plot was determined using five ear-leaves per plot. Leaves were collected on August 20. R 59 10/20/97

2 Plant population per plot was counted on October 9 including all plants in every plot. The number of ears per plot were counted at harvest on October 25. After harvest the number of kernels per ear using two average ears and kernel weight using 100 kernels were assessed. Results and Discussion Grain yield ranged from to bu/a. The control had the lowest yield whereas the Agrispon + 40 lbs of nitrogen and Agrispon lbs of nitrogen had the first and second highest yields, respectively (Table 2). The analysis of variance shown in Table 3 indicates that there were no significant differences among the six fertility programs for grain yield. Moisture content ranged from 13.9 to 15.1% (Table 2) with no significant difference among the fertility programs as shown by the analysis of variance in Table 4. Leaf area ranged from 3291 to 3661 cm 2 for five ear leaves per plot (Table 3). There were significant differences for leaf area among treatments as shown in the analysis of variance in Table 6. However, it appears that leaf area increased with the addition of nitrogen. The increase ranged from 3 to 6%. Agrispon treated plots had an increased leaf area of 2% (treatments 1 versus 3) over the control plots at the first rate of nitrogen. Agri-SC did not affect leaf area in the three fertility programs where it was used. There were no significant differences among treatments for the number of plants per plots (Table 7), the number of ears per plot (Table 8), the number of kernels per ear (Table 9) and kernel weight (Table 10). Table 1. Treatment list Agri-SC and Agrispon on corn at Waterloo, Iowa in 1990 (ACRES Code 90681A). Treatment Fertility Plot number number program Rep 1 Rep 2 Rep 3 Rep 4 T1 Control + 40 lbs of N T2 Agri-SC bs of N T3 Agrispon + 40 lbs of N T4 Agrispon + Agri-SC+ 40 lbs of N T5 Agrispon lbs of N T6 Agrispon + Agri-SC bs of N Field Map for Project 90681A Location: J 4 Number of Rows/Plot: 6 N Direction: W + E Planting Direction: E-W S 2

3 T1 101 T4 301 T2 102 T1 302 T3 103 T5 303 T4 104 T3 304 T5 105 T6 305 T6 106 T2 306 T3 201 T6 401 T5 202 T4 402 T1 203 T2 403 T6 204 T5 404 T2 205 T3 405 T4 206 T ft. 100ft TEST DETAILS LOCATION: City:...Waterloo County:...Black Hawk State:...Iowa FIELD CHARACTERISTICS: Previous Crop...Corn Tillage: Primary:...Disk Secondary:...Field cultivator Cultivation:...Row cultivator Soil Type: Silt loam O.M. (%): ph: C.E.C.: % Sand:...39 % Silt:...38 % Clay:...23 Fertilizer Applied: N (lb/a):...see treatment list P (lb/a):...0 K (lb/a):...0 Pesticides: Current year (/acre):...dual (2 pts)+bladex (2.4 lbs/a) Previous year (/acre):...dual (2 pts)+bladex (2.4 lbs/a) 3

4 CROP CHARACTERISTICS: Crop:...Corn Variety:...Pioneer 3475 Planting Date:...May 31 Planting Depth (inches):...2 Planting Rate/Acre:...30,200 PLOT DESIGN Experimental Design:...RCBD Replications:...4 Plot Size: Length (ft):...40 Width (ft):...15 Row Spacing (in):...30 HARVEST Date:...October 25 Area (ft x ft):...5 x 40 Equipment:...Massey 8 Combine Table 2: Treatment means for grain yield and moisture at Waterloo, Iowa in 1990 (ACRES Code 90681A). Treatment Fertility Grain Moisture number program yield content bu/a % T1 Control + 40 lbs of N T2 Agri-SC + 40 lbs of N T3 Agrispon bs of N T4 Agrispon + Agri-SC + 40 lbs of N T5 Agrispon lbs of N T6 Agrispon + Agri-SC lbs of N Table 3: Treatment means for leaf area (cm 2 /5 ear leaves), plant count per plot t5' x 40'), ear count per plot (5' x 40'), number of kernels per ear, and kernel weight in 9/100 kernels at Waterloo, Iowa in 1990 (ACRES Code 90681A). Treatment Fertility Leaf Plant Ear Kernel Kernel number program area count count number weight T1 Control bs of N T2 Agri-SC bs of N T3 Agrispon + 40 lbs of N T4 Agrispon + Agri-SC + 40 lbs of N T5 Agrispon lbs of N T6 Agrispon + Agri-SC lbs of N

5 Table 4. Analysis of variance for grain yield at Waterloo, Iowa in 1990 (ACRES Code 90681A). Total Replication Treatment Error Non-additivity Residual Grand Mean = Grand Sum = Total Count = 24 Coefficient of Variation = 10.00% Table 5. Analysis of variance for moisture content at Waterloo, Iowa in 1990 (ACRES Code 90681A). Total Replication Treatment Error Non-additivity Residual Grand Mean = Grand Sum = Total Count = 24 Coefficient of Variation = 5.34% Table 6. Analysis of variance for leaf area at Waterloo, Iowa in 1990 (ACRES Code 90681A). Total Replication Treatment Error Non-additivity Residual Grand Mean = Grand Sum = Total Count = 24 Coefficient of Variation = 3.98% Table 7. Analysis of variance for plant count at Waterloo, Iowa in 1990 (ACRES Code 90681A). Total Replication Treatment Error Non-additivity Residual Grand Mean = Grand Sum = Total Count = 24 Coefficient of Variation = 19.79% 5

6 Table 8. Analysis of variance for ear count at Waterloo, Iowa 1990 (ACRES Code 90681A). Total Replication Treatment Error Non-additivity Residual Grand Mean = Grand Sum = Total Count = 24 Coefficient of Variation = 19.77% Table 9. Analysis of variance for number of kernels per ear at Waterloo, Iowa in 1990 (ACRES Code 90681A). Total Replication Treatment Error Non-additivity Residual Grand Mean = Grand Sum = Total Count = 24 Coefficient of Variation = 12.87% Table 10. Analysis of variance for kernel weight in g/100 kernels at Waterloo, Iowa in 1990 (ACRES Code 90681A). Total Replication Treatment Error Non-additivity Residual Grand Mean = Grand Sum = Total Count = 24 Coefficient of Variation = 9.37% 6

7 Table 11. Raw data for grain yield and moisture content at Waterloo, Iowa in 1990 (ACRES Code 90681A). Case Plot Treatment Replication Grain Moisture number number number number yield content bu/a %

8 Table 12: Raw data for leaf area (cm2/5 ear leaves), plant count per plot (5 x 40), ear count per plot (5 x 40), number of kernels per ears, and kernel weight in 9/100 kernels at Waterloo, Iowa in 1990 (ACRES Code 90681A). Case Plot Treatment Rep Leaf Plant Ear Kernel Kernel number number number number area count count number weight