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Moisture Deficit Effects on Cotton Lint Yield, Yield Components, and Boll Distribution

USDA-ARS, Crop Genetics and Prod. Res. Unit, P.O. Box 345, Stoneville, MS 38776

View larger version (27K): [in a new window]   Fig. 1. White blooms (blooms at anthesis) per square meter of ground area of cotton at various days after planting throughout the 1998 and 1999 growing seasons in plots of either dryland or irrigated cotton plants. These soil moisture treatment means were averaged across eight genotypes. Vertical bars denote LSD values at the 0.05 level and are present only when the differences between soil moisture treatments are statistically significant at the 0.05 level. Dates of the irrigation events are marked by the arrows.

View larger version (26K): [in a new window]   Fig. 2. White blooms (blooms at anthesis) per square meter of ground area of cotton at various days after planting (DAP) throughout the 2000 and 2001 growing seasons in plots of either dryland or irrigated cotton plants. These soil moisture treatment means were averaged across eight genotypes. Vertical bars denote LSD values at the 0.05 level and are present only when the differences between soil moisture treatments are statistically significant at the 0.05 level. Dates of the irrigation events are marked by the arrows. In 2001, an irrigation event also occurred at 57 DAP.

View larger version (26K): [in a new window]   Fig. 3. Number of main-stem nodes of cotton above a sympodial branch with a first-position white bloom (bloom at anthesis) at various days after planting (DAP) throughout the 1998 and 1999 growing seasons in plots of either dryland or irrigated cotton plants. These soil moisture treatment means were averaged across eight genotypes. Vertical bars denote LSD values at the 0.05 level and are present only when the differences between soil moisture treatments are statistically significant at the 0.05 level. Dates of the irrigation events are marked by the arrows. Irrigation events also occurred at 100 DAP in 1998 and at 101 and 110 DAP in 1999.

View larger version (25K): [in a new window]   Fig. 4. Number of main-stem nodes of cotton above a sympodial branch with a first-position white bloom (bloom at anthesis) at various days after planting (DAP) throughout the 2000 and 2001 growing seasons in plots of either dryland or irrigated cotton plants. These soil moisture treatment means were averaged across eight genotypes. Vertical bars denote LSD values at the 0.05 level and are present only when the differences between soil moisture treatments are statistically significant at the 0.05 level. Dates of the irrigation events are marked by the arrows. Irrigation events also occurred at 101 DAP in 2000 and at 57 DAP in 2001.

View larger version (49K): [in a new window]   Fig. 5. Lint percentage response of eight cotton genotypes when grown under either dryland or irrigated conditions. Genotype means were averaged across the years 1998 to 2001. Vertical bars denote LSD values at the 0.05 level and are present only when the differences between soil moisture treatments for the individual genotypes are statistically significant at the 0.05 level.