The effect of potash level on several characters in four strains of upland cotton which differ in foliage growth
1944
Turner, J.H. Jr
1. Four strains of upland cotton, differing in foliage characteristics, were studied for three consecutive years at three levels of potash fertilizer. 2. Significant increases in yield of seed cotton per acre were shown between 20-, 40-, and 80-pounds levels of potash. 3. Highly significant differences were found to exist between the light foliaged strain and the three strains of heavier foliage. Differences of significance were not general between the three strains of heavier foliaged growth, but trends were observed which indicated that the heaviest foliaged strain gave the largest response to higher potash levels. 4. The lightest foliaged strain showed a significantly greater bloom production than the heavy foliaged types. 5. No definite effect of bloom production was identified with potash levels. 6. Significant increases in boll size were found when potash was increased. Significant differences were also found between all strains with the average boll size becoming larger as density of foliage increased. 7. The various measures of production efficiency may be summarized by stating that high bloom production was not indicative of high yields, that different foliaged types showed significant differences in setting efficiency, and that higher levels of potash were of significant benefit in setting more fruit. Strain X treatment interactions were significant for all measures of production efficiency. 8. Leaf loss was significantly lower for the higher levels of potash. Light-foliaged types lost the most leaves. Significant differences were present between each strain, with leaf loss diminishing as density of foliage increased.
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