The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers.

No description available.

Wastewater from urban areas can be a valuable source of water and plant nutrients for neighboring agricultural producers, particularly in arid regions of the world. A derived effluent demand function for agricultural producers near Tucson, Arizona, reveals a potential demand of 11,000 acre-feet under present price and delivery system conditions. In this case, wastewater could be exchanged for ground water and both the urban and rural areas would gain.

The importance of residual soil nitrogen (N) in the production of upland cotton in Central Arizona has not been adequately studied. A subsurface drip irrigation experiment was conducted at the Maricopa Agricultural Center to examine the effect of residual soil nitrate content on lint yields of upland cotton, and to evaluate the validity of current cotton petiole nitrate interpretations under high yielding conditions. Different levels of water and N fertilizers applied to the plot area in previous years had resulted in a range of residual NO₃-N content ranging from 36 to 166 lbs /acre. Lint yields increased from 2.8 to 4.3 bales /acre as residual soil N increased from 5.7 to 27.7 ppm NO₃-N although the correlation between yield and soil N was relatively low. This was thought to be due to difficulty in obtaining soil samples that accurately reflect the true plant availability of N in soils irrigated with drip systems. The interpretation of cotton petiole data under high yielding conditions (> 4 bales/acre) proved to be essentially the same as that currently recommended for conventional furrow irrigated cotton.

Seedling emergence, plant establishment, plant height, and seed cotton yield for cotton grown with liquid sewage sludge were similar to the seedling emergence, plant establishment, plant height, and seed cotton yield for cotton grown with recommended inorganic fertilizer. High applications of liquid sewage sludge decreased water penetration in Pima clay loam soil.

Data on the potential salts and organics leaching under cotton fertilized with municipal sewage sludge is necessary to delineate best management practices when cotton is fertilized in this manner.

No description available.