The absolute value of the t stat (2.6568) is > then the two tailed t critical value (2.131), and indicates that the results for treatment #1 are indeed different to those from #2. The t-stat sign (-) indicates that the #1 mean is smaller than the #2 mean and that the difference is significant, since the t stat value > the (one tailed) t critical value (2.6568 compared to 1.75305). The p values are a measure of the reliabililty of these parameters.