Phalaris has low dmt content. So Its important to stress your plants to increase alkaloid content. chek out erowid for more info.
Don't expect much out of that grass. Even with stressing, you probably won't get great alkaloid content.
Chacruna (Latin - Psychotria Viridis) - A green leafy jungle plant containing N, N Dimethyl-Tryptamine (DMT). The amount of DMT in this plant varies from plant to plant and depending on how it is harvested. Highest DMT concentrations are found when the leaves are harvested at dusk or dawn (Average 9mg DMT per gram of Psychotria Viridis. As a general guideline for average potency varieties, approximately 30 grams of chacruna leaves would be added for one dose. Jurema Preta (Latin - Mimosa Hostilis) - A plant that contains high concentrations of DMT within it's root bark. The root bark is often a crimson red to deep purple colour. Mimosa Hostilis is a very common ayahuasca admixture particularly in Brazil where it has been used traditionally. As a general guideline, only 10-20 grams of rootbark is needed for one dose. Chaliponga, Chagropanga (Latin - Diplopterys Cabrerana) - Another green leafy jungle plant from South America containing high concentrations of DMT. This plant is used as an ayahuasca admixture of higher potency than that of Chacruna, but often throughout the same regions as Chacruna usage. It can be several times stronger than Chacruna. I have not tried this one myself, and therefore cannot tell what a single dose measurement might be. found this, if that is helpful at all, which i'm sure it wont be.