Effects of Irrigation Intensity and Nitrogen Level on the Performance of Eight Varieties of Upland Cotton, Gossypium hirsutum L.1

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Abstract
The effects of four irrigation treatments and two levels of nitrogen on the performance of eight varieties of upland cotton were studied over a 3‐year period on Glendale silty clay loam at Yuma, Arizona.The varieties (‘Acala 44‐10,’ ‘Deltapine Smooth Leaf,’ ‘DeKalb 220,’ ‘Stoneville 7‐A,’ California Strains A and A‐65, and Arizona Experimentals 221 and 6010) tended to respond similarly to the irrigation treatments. Highest yields were obtained from all varieties under irrigations spaced 14 to 21 days apart with totals of 102 to 119 cm of applied water per season. Much lower yields were obtained from the “dry” irrigation treatments which approached depletion of the available soil moisture before each irrigation, with totals of 84, 84, and 64 cm of applied water, respectively, for the 3 years. Irrigation every 7 days, in 1963 and 1964, with totals of 147 and 160 cm of applied water produced yields of seed cotton almost as low as those from the dry treatments.Under the 14‐ and 21‐day irrigation schedules, application of ammonium sulfate at the rate of 224 kg N/ha, when compared with no applied nitrogen and with 84 kg N/ha, increased yields of seed cotton in all varieties. In 1963, application of 112 kg N/ha in midseason was equal to 224 kg N/ha applied before the first postemergence irrigation. Nitrogen level had no effect on yield under the dry 28‐day irrigation schedule. Under the wet 7‐day irrigation schedule, yields of Acala 44‐10 and Arizona Experimental 221 were reduced by high nitrogen while yields from the other varieties were unaffected or slightly increased.There was no consistent treatment effect on lint percentage or fiber properties.
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