Many Acala cottons go rank when over-irrigated, and the final yield is often less than maximum. Under-watering also reduces yield. The goal of this project was to find the depth of water application that would maximize yield. This is the end of the third season of an experiment in field 41A of the south 40, with 6 different application rates, using daily irrigation with a subsurface drip irrigation system. A RCB split plot design was used with 2 reps to compare Maxxa to PhytoGen-72. Each of the main treatment…
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W.R. DeTar and C.J Phene
OBJECTIVES: To compare subsurface drip to furrow irrigation of Acala cotton on a good soil (uniform, high silt content) and a poor soil (non-uniform, sand streaks and pockets) , by measuring growth characteristics, yields, and water use. Also to verify technical feasibility of drip irrigation and to determine problem areas.
PROCEDURES: Equipment procurement and installation began in the Fall of 1989 for a 1.2 ha field located near the southwest…
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W.R. DeTar and L.F. Elliott
OBJECTIVES: To evaluate various subsurface dripperlines for use with cotton on a very sandy soil, by measuring uniformity of emergence, plant growth characteristics, yields, and changes in flow rates.
PROCEDURES: Table 1 shows the various combinations of tubing types, depth of placement, emitter spacing, discharge rate, and wall thickness for some of the companies that felt that their product was suitable for subsurface drip irrigation of cotton.
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OBJECTIVES: To compare drip and furrow irrigation by measuring
the emergence, plant growth characteristics, yield, rate of plant die-off, and water use of Acala cotton on very sandy soil with a great deal of pressure from nematodes and Fusarium wilt.
PROCEDURES: This experiment was started in the Spring of 1989 on a 0.4-ha plot of uniform loamy sand soil.
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