The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers. / Seed of 19 upland cotton varieties was planted early in the season at 3 locations to evaluate relative emergence. Variety comparisons for seedling emergence were consistent at the 3 locations. Comparison of performance of older varieties with past years showed consistent relative emergence in 7 comparisons and an apparent weak seed lot for one variety in 1985 and apparent weak seed lots for another variety in past years. Deltapine 41 has consistently been near the bottom in early season seedling emergence over years and Deltapine 61 has been below average.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers. / Low quality Deltapine (DP) 41 seed had lower germination, lower cold test germination, reduced stand, and reduced lint yield in four tests in Arizona in 1985.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers. / Partial pre-germination of Deltapine 90 seed under oxygen and then drying prior to planting tended to speed and increase emergence in two tests in 1985, but did not increase lint yield.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers. / Six lots of Deltapine (DP) 90 of different seed densities were planted at three planting rates in four tests in Arizona in 1985. The lowest density seed lot had significantly lower standard germination, cold test germination, field emergence, and lint yield than other seed lots. The highest density seed lot had slightly higher lint yield and field emergence than other lots on an average.

The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers. / Comparison of 23 low quality upland cotton seed lots with high quality lots in 19 tests over 4 years showed consistent lint yield reduction from low quality seed. The low quality seed lots produced an average of 226 pounds less lint/acre than high quality seed. At $0.60/pound of lint that is $135.37/acre. By analysis of covariance, which adjusted lint yield for equal stand, poor stand explained 162 pounds of lint loss ($97.20/acre) and apparent reduced seedling vigor accounted for 64 pounds of lint loss or $38.16/acre.

No description available.