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Dep. of Plant and Soil Science, Alabama A&M Univ., P.O. Box 1208, Normal, AL 35762 USA
reddyc{at}aamu.edu
The development of conservation tillage systems for cotton (Gossypium hirsutum L.), capable of reducing soil erosion and improving soil quality while increasing yields and profits, remains a challenge in the southeastern USA. Poor emergence and growth, delayed maturity, and reduced yield are some of the problems that have been encountered in the use of conservation tillage on cotton. The objectives of this study was to evaluate the effects of tillage (no-till, mulch-till, conventional till), cropping system [cottonwinter fallow, cottonwinter rye (Secale cereale L.) cover crop] and N source (poultry litter, ammonium nitrate) on growth and yield of cotton from 1996 to 1998 in northern Alabama. In 1997, cotton lint yield under no-till (NT) was 24 and 18% greater than that under conventional till (CT) and mulch-till (MT) systems, respectively. In 1998, cotton lint yield under the NT system was 7% greater than that under CT. Poultry litter (PL) at 100 kg N ha-1 gave similar lint yield to ammonium nitrate (AN), whereas at 200 kg N ha-1, lint yields were significantly greater. No-till, cottonwinter rye cropping, and surface application of 200 kg N ha-1 in form of PL conserved soil moisture in the top 7 cm of the soil. This resulted in early seedling emergence, high seedling vigor, good plant growth, and high lint yield of cotton. These treatments would be appropriate for use in the southeastern USA where soil erosion is a problem and plenty of PL is available each year from the poultry industry.
Abbreviations: AN, ammonium nitrate CC, cottonwinter fallow CR, cotton-winter rye CT, conventional till LAI, leaf area index MT, mulch-till NT, no-till PL, poultry litter
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