Dryland Sorghum-Cotton Rotation Trial at AG-CARES, Lamesa, TX, 2000


Dryland Sorghum-Cotton Rotation Trial at AG-CARES, Lamesa, TX, 2000


Calvin Trostle & Jim Barber, Sorghum PROFIT, TAEX-Lubbock; Danny Carmichael, TAES-Lubbock. c-trostle@tamu.edu, (806) 746-6101

METHODS AND PROCEDURES (for sorghum planting):

Soil Type:            Amarillo fine sandy loam

Planting:              June 14, 2000 on 40” rows

Previous Crop:   Sorghum

Seeding Rate:      ~32,000 seeds/acre with vacuum planter (about 2.0 to 2.3 lbs./acre) and ~65,000 seeds/acre (about 4.0 to 4.5 lbs./acre)

Plot Set-up:         Three blocks of 128 rows X 880’ long. Within each block there are four 32-row strips of which one is sorghum (seeding rate, residue, and N treatments) and three are cotton (two 32-row strips for Year 2001 and year 2002 rotation; one 32-row strip for continuous cotton)

Harvest Area:     Drought loss on all treatments

Fertilizer:             None

Herbicide:           ?

Insecticide:          None

Rainfall:               See Lamesa area summary elsewhere in the AG-CARES report

Date Harvested: None


No harvestable yield was obtained for sorghum in 2000 due to drought.

A long-term 2:1 cotton-sorghum dryland rotation was established over 25 acres in three blocks (see table). At AGCARES Novartis KS 524 was seeded at two rates including 4 lbs./A, a high seeding rate that is too often used by growers in dryland sorghum. Sorghum residues in December 2000 were either cut with a stalk cutter or left standing. We believe the latter residue treatment may offer an advantage over cut stubble by reducing wind erosion or eliminating the need for sandfighting. Nitrogen treatments for sorghum were not applied due to the drought conditions.

For subsequent years the rotation program for sorghum and cotton is in place in spite of no yield data for 2000. Evaluation of sorghum rotation and sorghum residue effects on cotton will be compared to continuous cotton in addition to seeding rate and nitrogen work in sorghum.

Figure 1. AGCARES dryland arrangement of 1:2 sorghum-cotton rotation with continuous cotton comparison (26 acres).

North End 2000-2001-2002
Row # Cropping Sequence # of Rows Block Number
161-168 Solid continuous cotton 8 Border
169-200 Cotton-sorghum-cotton 32 1
201-232 Solid & skip continuous cotton 32 1
233-264 Sorghum-cotton-cotton 32 1
265-296 Cotton-cotton-sorghum 32 1
297-328 Cotton-sorghum-cotton 32 2
329-360 Solid & skip continuous cotton 32 2
361-392 Sorghum-cotton-cotton 32 2
393-424 Cotton-cotton-sorghum 32 2
425-456 Cotton-sorghum-cotton 32 3
457-488 Solid & skip continuous cotton 32 3
489-520 Sorghum-cotton-cotton 32 3
521-552 Cotton-cotton-sorghum 32 3
553-560 Solid continuous cotton 8 Border

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