In (b), the Soil OC content mean of females is significantly different from the Soil OC content mean of males.
From the descriptive statistics, the mean of Manure application is 0.69 (with 0.33 standard deviation) for females and 1.65 (with 1.17 standard deviation) for males, and based on the t test results we can conclude that the Manure application mean of females is highly and significantly smaller than that of males. [similar comment can be written for Soil OC content mean.]