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Row competition and its relation to cotton varieties of unlike plant growth

Hancock, N.I.
Agronomy journal 1936 v.28 no.11 pp. 948-957
Gossypium hirsutum, crop yield, plant competition, varieties, agronomic traits, rain, air temperature, planting date, harvest date, row spacing, statistical analysis, plant development, Tennessee
1. Measurements are given to show that the California Acala and Delfos 6102 varieties used in this experiment differ materially in their morphological characters. 2. An attempt was made to induce row competition by planting these varieties in different combinations of single-row plats so that full and partly full expressions of their plant growth might be reflected upon each other. 3. The experiment was carried on over a period of 4 years and each combination was in the trials 43 times during this period. 4. The experiment showed effect from the unequal plant growth as given in Table 6, and that plant competition in cotton would become an additive factor if the average were taken over a period of years. 5. For a given season, however, the degree of this effect was small and not significant in the Delfos combinations; in most instances it was fairly large in the Acala combinations, but the significance is small as measured by the given mathematical methods. 6. It is suggested that two-row plats be used for cotton varietal trials on medium fertile soil.