Grain Sorghum Rotations

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Presentation transcript:

Grain Sorghum Rotations By Gary Strickland Extension Educator, Jackson County, Ag/4H/CED 1

Discussion Topics Advantages to Rotation Systems Grain Sorghum Herbicides in Rotations Altus Tillage and Cropping Systems Data 2

Rotation System Advantages Crop residues increased in season precipitation use efficiency Over a 58 year time period, yield increases were related 46% to improved hybrids and 93% to improved soil water at planting This study showed that Grain Sorghum and Wheat Yields were greater in rotation sequences than in mono-crop situations 3

Rotation System Advantages Cont’d. With wheat, soil water at planting was increased with corn and grain sorghum rotations but not with sunflower or soybean. Wheat grain fill and number of heads were better with corn and grain sorghum rotations. Study showed that high mineral N in the one inch seed zone area indicated that starter-band or side-dress applications were not necessary for optimum economic return to N fertilization. 4

Rotation System Advantages Cont’d. Soil organic matter increased by 35% in the 0-5 cm range in the NT system when compared to the CT system Potentially mineralizable N increased in this same soil depth range by 54% in the NT system However when looking at the 0-15 cm soil depth range there were no tillage differences 5

Grain Sorghum Herbicides in Rotations Herbicides utilized in a rotation program should increase weed control potential Differing M.O.A. sites and chemistry will address weed species diversity Roundup – preplant and preemergence Dual – Pre-emergence herbicide, probably better in CT Systems (Cinch ATZ Lite in NT Systems, soil texture type specific) Peak, Buctril, or Basagran – Broadleaf post-emergence herbicides Atrazine – Good broadleaf option, with some grass control benefits but watch the pH and crop rotation issues. 6

Altus Tillage and Cropping Systems Rotation Data 7

Grain Sorghum Yields 2003-2007 Cropping Systems 2003 Yield Lbs./A 2004 2005 2006 2007 C-W-GS --- 2274 (NT) 0 (CT) C-GS 3108 (NT) 3774 (CT) 3709 (NT) W-DCGS-C 1023 (NT) 1092 (CT) 0 (NT) GS 2955 (NT) 2627 (CT) 4963 (NT) 4827 (CT) 2864 (NT) 4441 (NT) 2415 (CT) 8

Total Returns above Production Inputs Cropping Systems Total Returns above Production Inputs $/A Harvested Crops C-W-GS 618.56 (NT) 328.15 (CT) 2 C, 1 W, 1 GS C-GS 764.36 (NT) 483.62 (CT) 3 C, 2 GS W-DCGS-C 452.65 (NT) 325.88 (CT) 2 W, 2 GS, 2 C GS 292.80 (NT) 71.28 (CT) 4 GS 9

W-DCGS-C C-W-GS C-GS C-W GS C W 10

W-DCGS-C C-W-GS C-GS C-W C W GS 11

W-DCGS-C C-W-GS C-W C-GS C W GS 12

W-DCGS-C C-W-GS C-W C-GS C W GS 13

Any Questions 14