Effect of nitrogen and phosphorus on the yield and root rot responses of early and late varieties of cotton
1944
Blank, L.M.
A study of the effect of nitrogen and phosphorus fertilizers in combination with early and late maturing varieties of cotton upon the incidence of root rot and the yield of seed cotton was made on two soil types in Texas over a period of 3 years. The mean effect of nitrogen was to decrease the amount of disease by a significant or highly significant margin in 2 of the 3 years at each location, and yields were increased by a highly significant margin in all years at both locations. Phosphorus had no appreciable effect upon disease or yield at one location, while at the second location both disease and yield were increased in 2 of the 3 years. Although early varieties as a group were as susceptible to disease as the later varieties, they outyielded the latter group by a highly significant margin in all years at one location and in 2 of the 3 years at the second location.
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