GROWTH RESPONSE OF LEUCAENA LEUCOCEPHALA ASSOCIATED WITH ARBUSCULAR ENDOMYCORRHIZAE TO APPLICATIONS OF ORGANIC MATTER IN SOIL IRRIGATED WITH SEWAGE WATER

摘要

In the irrigation District 018, Tulancingo, Hidalgo, Mexico forage for cattle is irrigated with residual water. To evaluate the level of contamination of two plots, one hectare was irrigated with residual water and the other with clean water. Later a greenhouse experiment with Leucaena leucocephala (guaje) to observe its growth with inoculation of Glomus intraradices with different amounts of vermicompost was esatblished. A factorial experiment 7x2 completely randomized design with five replications in the greenhouse was used. The variables measured were plant height, stem diameter, root volume dry weight of biomass, dry weight of roots. The experiment lasted 180 days from planting until harvesting. It is concluded that the inoculation with Glomus intraradices increased the efficiency of Leucaena leucocephala in nutrient adsorption. In soil the contamination of Cu, Cr and Ni are below the established limits for contaminants. Pb was not found. A comparison of soil irrigated with clean water or sewage water indicated that Cu is nearly twice as concentrated in soil irrigated by contaminated water; Ni is slightly greater; Cr is more abundant in soil irrigated with clean water.