|Camp Jr, Carl|
Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 8/15/1995
Publication Date: N/A
Technical Abstract: Buried microirrigation for agronomic crops is new to the southeastern USA Coastal Plain, and crop response information is needed when both water and N fertilizer are applied through the tubing. Our objective was to determine the impact of tubing placement on water and N status of cotton (Gossypium hirsutum). Treatments were tubing buried under every row (IR), buried in alternate furrows (AF), or none. Tubing was buried 30 cm deep, and cotton was grown in 1-m rows. We monitored water potential, petiole nitrate-N level, and blade N levels of uppermost fully expanded leaves in July and August of 1991 through 1994. When unirrigated cotton was at greatest water deficit stress, leaf water potential of cotton grown with AF placement was 0 to 0.3 MPa lower than cotton grown with IR placement. Tubing placement had only a small effect on leaf blade N and petiole nitrate-N levels. No N deficiencies were detected in any tube placement treatment. The data suggest AF placement of buried microirrigation tubing is sufficient for irrigation and N fertilization purposes in cotton.